What Are Acura OBD2 Scanner Codes And What Do They Mean?

Acura Obd2 Scanner Codes are diagnostic trouble codes (DTCs) that your Acura’s onboard computer system generates when it detects a problem. Understanding these Acura diagnostic codes, related diagnostic tools, and services offered by MERCEDES-DIAGNOSTIC-TOOL.EDU.VN empowers you to address issues efficiently. We offer in-depth guidance and support to ensure you can confidently troubleshoot and maintain your Acura.

1. Understanding Acura OBD2 Scanner Codes

1.1 What are Acura OBD2 Codes?

Acura OBD2 (On-Board Diagnostics II) codes are standardized alphanumeric codes used to identify potential issues within your Acura vehicle’s systems. These codes are generated by the car’s computer when it detects a malfunction. When your Acura’s check engine light illuminates, it signifies that one or more of these codes have been stored in the vehicle’s memory. According to the Environmental Protection Agency (EPA), all cars and light trucks built after 1996 are required to have an OBD2 system. These systems are standardized across manufacturers, ensuring that a P0171 code on an Acura means the same thing on a Honda.

1.2 Why are Acura OBD2 Codes Important?

OBD2 codes are essential for several reasons:

• Early Problem Detection: They help identify potential issues early on, preventing more significant and costly repairs down the line.
• Informed Decision-Making: Understanding these codes enables you to make informed decisions about necessary repairs, whether you choose to perform them yourself or seek professional assistance.
• Effective Communication with Technicians: Knowing the codes allows for clearer communication with mechanics, leading to more accurate diagnoses and efficient repairs.
• Verification of Repairs: After a repair is completed, clearing the codes and re-scanning can confirm whether the issue has been successfully resolved.

1.3 Common Acura OBD2 Code Categories

OBD2 codes are generally divided into several categories, each representing a different vehicle system:

• P Codes (Powertrain): These codes relate to the engine, transmission, and related components. They are the most common type of OBD2 codes.
• B Codes (Body): These codes pertain to systems within the vehicle’s body, such as airbags, power windows, and central locking.
• C Codes (Chassis): These codes relate to chassis systems like ABS (Anti-lock Braking System), traction control, and electronic stability control.
• U Codes (Network & Vehicle Integration): These codes refer to communication issues between the various computer systems within the vehicle.

1.4 How to Retrieve Acura OBD2 Codes

To retrieve Acura OBD2 codes, you will need an OBD2 scanner. This device plugs into the OBD2 port, typically located under the dashboard on the driver’s side.

Steps to Retrieve Codes:

1. Plug in the Scanner: Turn off your vehicle and plug the OBD2 scanner into the OBD2 port.
2. Turn on the Ignition: Turn the ignition key to the “ON” position without starting the engine.
3. Read the Codes: Follow the scanner’s instructions to read the stored codes. The scanner will display the codes along with a brief description.
4. Record the Codes: Write down the codes and their descriptions for further investigation.

1.5 Understanding Freeze Frame Data

When an OBD2 code is stored, the system also captures “freeze frame” data. This data provides a snapshot of the vehicle’s operating conditions at the moment the fault occurred. This information can be invaluable for diagnosing intermittent problems.

Key Freeze Frame Data Points:

• Engine RPM: Revolutions per minute of the engine.
• Vehicle Speed: Speed of the vehicle.
• Engine Load: Percentage of engine load.
• Coolant Temperature: Temperature of the engine coolant.
• Fuel Trim: Adjustments made to the fuel mixture.

2. Common Acura OBD2 Codes and Their Meanings

2.1 P0171: System Too Lean (Bank 1)

This code indicates that the engine is running with too little fuel or too much air in Bank 1.

Possible Causes:

• Vacuum Leaks: Leaks in the intake manifold or vacuum hoses.
• Faulty MAF Sensor: A malfunctioning Mass Airflow (MAF) sensor.
• Clogged Fuel Filter: A restricted fuel filter.
• Weak Fuel Pump: A failing fuel pump.
• Dirty Fuel Injectors: Clogged or dirty fuel injectors.

Troubleshooting Steps:

1. Inspect for Vacuum Leaks: Check all vacuum hoses and intake manifold gaskets for leaks.
2. Clean or Replace MAF Sensor: Clean the MAF sensor with a specialized cleaner or replace it if necessary.
3. Replace Fuel Filter: Replace the fuel filter to ensure proper fuel flow.
4. Check Fuel Pressure: Use a fuel pressure gauge to verify the fuel pump is delivering adequate pressure.
5. Clean Fuel Injectors: Use a fuel injector cleaner or have the injectors professionally cleaned.

2.2 P0300: Random/Multiple Cylinder Misfire Detected

This code indicates that the engine is experiencing misfires in multiple cylinders.

Possible Causes:

• Worn Spark Plugs: Old or worn spark plugs.
• Faulty Ignition Coils: Malfunctioning ignition coils.
• Vacuum Leaks: Leaks in the intake manifold or vacuum hoses.
• Low Fuel Pressure: Inadequate fuel pressure.
• Faulty Fuel Injectors: Malfunctioning fuel injectors.
• Low Compression: Low compression in one or more cylinders.

Troubleshooting Steps:

1. Inspect Spark Plugs: Check the spark plugs for wear or damage and replace them as needed.
2. Test Ignition Coils: Use a multimeter to test the ignition coils and replace any that are not functioning correctly.
3. Check for Vacuum Leaks: Inspect all vacuum hoses and intake manifold gaskets for leaks.
4. Check Fuel Pressure: Use a fuel pressure gauge to verify the fuel pump is delivering adequate pressure.
5. Test Fuel Injectors: Use a multimeter to test the fuel injectors and replace any that are not functioning correctly.
6. Perform Compression Test: Conduct a compression test to check for low compression in the cylinders.

2.3 P0420: Catalyst System Efficiency Below Threshold (Bank 1)

This code indicates that the catalytic converter is not functioning efficiently.

Possible Causes:

• Faulty Catalytic Converter: A worn or damaged catalytic converter.
• Faulty Oxygen Sensors: Malfunctioning oxygen sensors.
• Exhaust Leaks: Leaks in the exhaust system.
• Engine Misfires: Misfires causing excessive hydrocarbons to enter the catalytic converter.

Troubleshooting Steps:

1. Inspect Oxygen Sensors: Check the oxygen sensors for proper function and replace if necessary.
2. Check for Exhaust Leaks: Inspect the exhaust system for leaks.
3. Address Engine Misfires: Resolve any engine misfires that may be contributing to the problem.
4. Test Catalytic Converter: Use an OBD2 scanner to monitor the catalytic converter’s efficiency.

2.4 P0442: Evaporative Emission Control System Leak Detected (Small Leak)

This code indicates that there is a small leak in the evaporative emission control system.

Possible Causes:

• Loose or Damaged Fuel Cap: A loose or damaged fuel cap.
• Faulty Purge Valve: A malfunctioning purge valve.
• Cracked Hoses: Cracked or damaged evaporative emission hoses.
• Faulty Fuel Tank Pressure Sensor: A malfunctioning fuel tank pressure sensor.

Troubleshooting Steps:

1. Check Fuel Cap: Ensure the fuel cap is properly tightened and in good condition.
2. Inspect Hoses: Check all evaporative emission hoses for cracks or damage.
3. Test Purge Valve: Use a multimeter to test the purge valve and replace if necessary.
4. Test Fuel Tank Pressure Sensor: Use an OBD2 scanner to monitor the fuel tank pressure sensor.

2.5 P0505: Idle Air Control System Malfunction

This code indicates a problem with the idle air control system, which regulates the engine’s idle speed.

Possible Causes:

• Dirty Throttle Body: A dirty throttle body.
• Faulty Idle Air Control Valve: A malfunctioning idle air control valve.
• Vacuum Leaks: Leaks in the intake manifold or vacuum hoses.

Troubleshooting Steps:

1. Clean Throttle Body: Clean the throttle body to remove carbon buildup.
2. Test Idle Air Control Valve: Use a multimeter to test the idle air control valve and replace if necessary.
3. Check for Vacuum Leaks: Inspect all vacuum hoses and intake manifold gaskets for leaks.

2.6 Additional Acura OBD2 Codes

Code	Common Problems That Trigger This Code
P0010	Powertrain Control Module (PCM) failure, Variable valve timing actuator failure, Wiring issue
P0011	Camshaft variable timing solenoid failure, Engine oil level is too low, The engine is not timed correctly, The engine oil does not meet the manufacturer’s requirements, Variable valve timing actuator failure, Worn timing chain
P0012	Camshaft variable timing solenoid failure, Engine oil level is too low, The engine is not timed correctly, The engine oil does not meet the manufacturer’s requirements, Variable valve timing actuator failure, Worn timing chain
P0013	Powertrain Control Module (PCM) failure, Variable valve timing actuator failure, Wiring issue
P0014	Camshaft variable timing solenoid failure, Engine oil level is too low, The engine is not timed correctly, The engine oil does not meet the manufacturer’s requirements, Variable valve timing actuator failure, Worn timing chain
P0101	Large vacuum leaks, Split Intake Air Boot or PCV Hose, Defective intake manifold gaskets, Mass Airflow Sensor (MAF), Mass Air Flow Sensor circuit and or wiring problems, Defective Barometric Pressure Sensor, Dirty or contaminated Mass Air Flow Sensing wire or filament, PCM software needs to be updated
P0102	The Mass Airflow Sensor (MAF) Sensor is unplugged or the wiring is damaged, Loose or corroded electrical terminals in the MAF Sensor circuit, Faulty MAF Sensor
P0113	Defective Intake Air Temperature Sensor, Dirty air filter, Defective Mass Air Flow Sensor, Faulty or corroded Intake Air Temperature Sensor wiring or connections
P0128	Defective Engine Thermostat, Defective Engine Coolant Temperature Sensor, Defective Intake Air Temperature Sensor, Defective Cooling System, Low Engine Coolant, Dirty Engine Coolant causing incorrect Coolant Temperature Sensor readings, Defective/always running Engine Cooling fan(s)
P0135	Defective Oxygen Sensor/Air Fuel Ratio Sensor, defective Oxygen Sensor/Air Fuel Ratio Sensor Heater Circuit, Exhaust System Leak, Intake Air System leak, Low Fuel Pressure, Defective Engine Coolant Temperature Sensor, Defective sensor wiring and/or circuit problem, PCM software needs to be updated, Defective PCM
P0174	PCM software needs to be updated, Vacuum leaks (Intake Manifold Gaskets, vacuum hoses, PCV hoses, etc.), Faulty Mass Airflow (MAF) Sensor, Plugged Fuel Filter or weak Fuel Pump, Plugged or dirty Fuel Injectors
P0200	Defective Fuel Injector, Faulty or corroded Fuel Injector, wiring, and/or connections, Plugged Fuel Injector, Dirt in the Fuel Injector
P0201	Defective Fuel Injector, Faulty or corroded Fuel Injector, wiring, and/or connections, Plugged Fuel Injector, Dirt in the Fuel Injector
P0202	Malfunction of the Fuel Injector, Malfunction of the PCM Fuel Injector driver circuit, Defective wiring/connections in the Fuel Injector wiring harness, Defective Fuel Injector power circuit(s)
P0203	Fuel injector failure, Powertrain Control Module (PCM) failure, Wiring issue
P0205	Fuel injector failure, Powertrain Control Module (PCM) failure, Wiring issue
P0301	Worn out spark plugs, ignition wires, coil(s), distributor cap and rotor (when applicable), Incorrect ignition timing, Vacuum leak(s), Low or weak fuel pressure, Improperly functioning EGR system, Defective Mass Air Flow Sensor, Defective Crankshaft and/or Camshaft Sensor, Defective Throttle Position Sensor, Mechanical engine problems (i.e.—low compression, leaking head gasket(s), or valve problems)
P0302	Worn out spark plugs, ignition wires, coil(s), distributor cap and rotor (when applicable), Incorrect ignition timing, Vacuum leak(s), Low or weak fuel pressure, Improperly functioning EGR system, Defective Mass Air Flow Sensor, Defective Crankshaft and/or Camshaft Sensor, Defective Throttle Position Sensor, Mechanical engine problems (i.e.—low compression, leaking head gasket(s), or valve problems)
P0303	Worn out spark plugs, ignition wires, coil(s), distributor cap and rotor (when applicable), Incorrect ignition timing, Vacuum leak(s), Low or weak fuel pressure, Improperly functioning EGR system, Defective Mass Air Flow Sensor, Defective Crankshaft and/or Camshaft Sensor, Defective Throttle Position Sensor, Mechanical engine problems (i.e.—low compression, leaking head gasket(s), or valve problems)
P0304	Worn out spark plugs, ignition wires, coil(s), distributor cap and rotor (when applicable), Incorrect ignition timing, Vacuum leak(s), Low or weak fuel pressure, Improperly functioning EGR system, Defective Mass Air Flow Sensor, Defective Crankshaft and/or Camshaft Sensor, Defective Throttle Position Sensor, Mechanical engine problems (i.e.—low compression, leaking head gasket(s), or valve problems)
P0401	Restriction in the EGR passages, usually caused by carbon buildup, The EGR Valve is defective, Lack of proper vacuum or electrical signal to the EGR valve, Malfunctioning EGR Vacuum supply solenoid, Lack of proper EGR system feedback to the computer from the: Manifold Absolute Pressure Sensor (MAP), Differential EGR Pressure Feedback Sensor (DPFE), EGR Valve Position Sensor (EVP), EGR Temperature Sensor
P0430	Defective Catalytic Converter, Internal engine damage resulting in high oil consumption and/or a leaking Head Gasket has damaged the Catalytic Converter
P0440	Missing fuel cap, Defective or damaged fuel cap, Distorted or damaged Fuel Tank Filler Neck, Torn or punctured Evaporative system hose(s), Defective Fuel Tank Sending Unit gasket or seal, Split or damaged Carbon Canister, Defective Evaporative Vent Valve and/or Evaporative Purge Valve, Defective or damaged fuel tank
P0441	Missing fuel cap, Stuck open or closed purge valve, Defective or damaged fuel cap, Distorted, damaged or cracked Fuel Tank Filler Neck, Torn or punctured Evaporative system hose(s), Defective Fuel Tank Sending Unit gasket or seal, Split or damaged Carbon Canister, Defective Evaporative Vent Valve, Defective or damaged fuel tank
P0455	Missing fuel cap, Defective or damaged fuel cap, Distorted or damaged Fuel Tank Filler Neck, Torn or punctured Evaporative system hose(s), Defective Fuel Tank Sending Unit gasket or seal, Split or damaged Carbon Canister, Defective Evaporative Vent Valve and/or Evaporative Purge Valve, Defective or damaged fuel tank, Defective Fuel Tank Pressure Sensor
P0500	Defective Vehicle Speed Sensor, Defective Speedometer, Vehicle Speed Sensor wiring or connector, Communication (CAN) bus problems, Defective transmission or differential Vehicle Speed Sensor drive gear
P0501	Defective Vehicle Speed Sensor, Defective Speedometer, Vehicle Speed Sensor wiring or connector, Communication (CAN) bus problems, Defective transmission or differential Vehicle Speed Sensor drive gear
P0506	Defective/sticking Idle Air Control Motor, Intake Manifold Vacuum leaks, Carbon buildup in the Throttle Body air passages, Defective Power Steering Pressure Switch
P0507	Defective/sticking Idle Air Control Motor, Intake Manifold Vacuum leaks, Carbon buildup in the Throttle Body air passages, Defective Coolant Temperature Sensor, Defective Charging System/Alternator, Defective Power Steering Pressure Switch
P0600	Defective PCM (Power Train Control Module), Defective PCM data bus wiring/connections, Defective PCM data bus ground circuit(s), Defective PCM or other control module controlled output devices, Defective CAN bus communication
P0601	Lack of proper voltage to the PCM, Defective PCM memory module, Defective PCM ground circuit(s), Defective PCM controlled output devices
P0602	Powertrain Control Module (PCM) failure, Wiring issue
P0603	Lack of proper voltage to the Keep Alive Memory connection on the PCM, Defective PCM Keep Alive Memory Module (KAM), Defective PCM ground circuit(s), Defective PCM controlled output devices
P0605	Lack of proper voltage and/or ground to the PCM, Defective PCM ROM memory module, Defective PCM ground circuit(s), Defective PCM controlled output devices
P0700	Defective Shift Solenoids, Defective Engine Coolant Temperature Sensor, Defective Valve Body, Dirty transmission fluid that restricts the hydraulic passages
P0705	Defective Transmission Range Sensor (PRNDL input), Defective Transmission Range Sensor (PRNDL input) wiring or connector, Defective Valve Body, Defective manual shift valve linkage, Dirty transmission fluid that restricts the hydraulic passages
P0706	Defective Transmission Range Sensor (PRNDL input), Defective Transmission Range Sensor (PRNDL input) wiring or connector, Defective Valve Body, Defective manual shift valve linkage, Dirty transmission fluid that restricts the hydraulic passages
P0720	Defective Output Speed Sensor, Defective Shift Solenoids, Defective Engine Coolant Temperature Sensor, Defective Valve Body, Dirty transmission fluid that restricts the hydraulic passages, Defective Output Speed Sensor wiring or connector
P0730	Defective Shift Solenoids, Defective Engine Coolant Temperature Sensor, Defective Valve Body, Dirty transmission fluid that restricts the hydraulic passages
P0841	Transmission Control Module (TCM) failure, Transmission fluid level is low, Transmission fluid pressure sensor failure, Wiring issue
P0842	Transmission Control Module (TCM) failure, Transmission fluid level is low, Transmission fluid pressure sensor failure, Wiring issue
P0845	Transmission Control Module (TCM) failure, Transmission fluid level is low, Transmission fluid pressure sensor failure, Wiring issue
P0846	Transmission Control Module (TCM) failure, Transmission fluid level is low, Transmission fluid pressure sensor failure, Wiring issue
P0847	Transmission Control Module (TCM) failure, Transmission fluid level is low, Transmission fluid pressure sensor failure, Wiring issue
P0901	Clutch master cylinder failure, Clutch solenoid failure, Transmission Control Module (TCM) failure
P0935	Hydraulic power unit assembly failure, Transmission Control Module (TCM) failure, Wiring issue
P0942	Hydraulic power unit assembly failure, Transmission Control Module (TCM) failure, Wiring issue
P0944	Clogged transmission filter, Transmission fluid level is low, Transmission oil pump failure, Wiring issue
P0961	Transmission shift solenoid failure
P0A08	Inverter/converter assembly failure, Powertrain Control Module (PCM) failure, Wiring issue
P0A0D	High voltage safety device failure, Inverter/converter assembly failure, Power management control module failure, Service disconnect plug is not properly connected, Wiring issue
P0A0F	Hybrid transaxle assembly failure, Internal engine failure, Power management control module failure
P0A7F	Poor connections at the HV battery, A problem with the HV battery, ECU issues
P0A80	High voltage battery assembly failure
P0B22	Battery contactor assembly failure, Battery Energy Control Module (BECM) failure
P0B24	Battery Energy Control Module (BECM) failure, High voltage battery assembly failure, Wiring issue
P0B26	Battery Energy Control Module (BECM) failure, High voltage battery assembly failure, Wiring issue
P0B28	Battery Energy Control Module (BECM) failure, High voltage battery assembly failure, Wiring issue
P0B30	Battery Energy Control Module (BECM) failure, High voltage battery assembly failure, Wiring issue
P0C00	Drive motor generator power inverter control module failure
P0C09	Drive motor generator assembly failure, Drive motor generator power inverter control module failure
P0C11	Coolant system leak, Drive motor generator power inverter control module failure, Engine cooling fan failure, Water pump failure
P0C14	Coolant system leak, Drive motor generator power inverter control module failure, Engine cooling fan failure, Water pump failure
P0C15	Coolant system leak, Drive motor generator power inverter control module failure, Engine cooling fan failure, Water pump failure
P2000	Diesel Particulate Filter (DPF) failure, Intake air leak, Mass Airflow (MAF) sensor is dirty/loss of calibration
PP2002	Diesel Particulate Filter (DPF) failure, Intake air leak, Mass Airflow (MAF) sensor is dirty/loss of calibration
P2004	A failed IMRC actuator, A problem with the intake manifold or linkage, Wiring issues
P2006	Intake manifold runner control actuator failure, Powertrain Control Module (PCM) failure, Restricted vacuum lines
P2101	Accelerator Pedal Position (APP) assembly failure, Powertrain Control Module (PCM) failure, Throttle control motor failure, Wiring issue
P2122	Accelerator Pedal Position (APP) assembly failure, Powertrain Control Module (PCM) failure, Throttle control motor failure, Wiring issue
P2135	Accelerator Pedal Position (APP) assembly failure, Powertrain Control Module (PCM) failure, Throttle Position Sensor (TPS) failure, Wiring issue
P2138	Accelerator Pedal Position (APP) assembly failure, Powertrain Control Module (PCM) failure, Throttle Position Sensor (TPS) failure, Wiring issue
P2181	Engine coolant heater failure, Engine coolant level is too low, Thermostat failure
P2210	NOx sensor failure, Powertrain Control Module (PCM) failure, Wiring issue
P2213	NOx sensor failure, Powertrain Control Module (PCM) failure, Wiring issue
P2237	Exhaust leak, Oxygen sensor failure, Powertrain Control Module (PCM) failure, Wiring issue
P2238	Exhaust leak, Oxygen sensor failure, Powertrain Control Module (PCM) failure, Wiring issue
P2251	Exhaust leak, Oxygen sensor failure, Powertrain Control Module (PCM) failure, Wiring issue
P2302	Ignition coil failure, Powertrain Control Module (PCM) failure, Wiring issue
P2303	Ignition coil failure, Powertrain Control Module (PCM) failure, Wiring issue
P2305	Ignition coil failure, Powertrain Control Module (PCM) failure, Wiring issue
P2308	Ignition coil failure, Powertrain Control Module (PCM) failure, Wiring issue
P2310	Ignition coil failure, Powertrain Control Module (PCM) failure, Wiring issue
P2401	Evap leak detection pump failure, Powertrain Control Module (PCM) failure, Wiring issue
P2402	Evap leak detection pump failure, Powertrain Control Module (PCM) failure, Wiring issue
P2422	EVAP vent valve failure, Powertrain Control Module (PCM) failure, Wiring issue
P2431	Air control solenoid failure, Powertrain Control Module (PCM) failure, Secondary Air System pressure sensor failure, Wiring issue
P2432	Air control solenoid failure, Powertrain Control Module (PCM) failure, Secondary Air System pressure sensor failure, Wiring issue
P2500	Alternator failure, Battery failure, Powertrain Control Module (PCM) failure, Wiring issue
P2501	Alternator failure, Battery failure, Powertrain Control Module (PCM) failure, Wiring issue
P2503	Alternator failure, Battery failure, Wiring issue
P2509	Powertrain Control Module (PCM) failure, Powertrain Control Module (PCM) power relay failure, Wiring issue
P250C	Oil level sensor failure, Powertrain Control Module (PCM) failure, Wiring issue
P2601	Coolant Heat Storage (CHS) water pump failure, Coolant Heat Storage (CHS) water pump relay, Powertrain Control Module (PCM) failure, Wiring issue
P2607	Intake air heater, Powertrain Control Module (PCM) failure, Wiring issue
P2609	Intake air heater, Powertrain Control Module (PCM) failure, Wiring issue
P2610	An internal PCM problem, A problem with the PCM power or ground circuit
P2614	Broken tone ring, Camshaft Position Sensor (CMP) failure, Powertrain Control Module (PCM) failure, Wiring issue
P2706	Transmission Control Module (TCM) failure, Transmission fluid level is low, Transmission shift solenoid failure, Wiring issue
P2711	Internal transmission failure, Transmission Control Module (TCM) failure, Transmission fluid level is low, Transmission solenoid failure, Wiring issue
P2714	Transmission Control Module (TCM) failure, Transmission fluid level is low, Transmission shift solenoid failure, Wiring issue
P2716	Transmission Control Module (TCM) failure, Transmission fluid level is low, Transmission shift solenoid failure, Wiring issue
P2723	Transmission Control Module (TCM) failure, Transmission fluid level is low, Transmission shift solenoid failure, Wiring issue
P2803	Powertrain Control Module (PCM) failure, Transmission Control Module (TCM) failure, Transmission range sensor failure, Wiring issue
P2806	Powertrain Control Module (PCM) failure, Transmission Control Module (TCM) failure, Transmission range sensor failure, Transmission range sensor is out of adjustment, Wiring issue
P2809	Transmission Control Module (TCM) failure, Transmission fluid level is low, Transmission pressure control solenoid failure, Wiring issue
P2810	Transmission Control Module (TCM) failure, Transmission fluid level is low, Transmission pressure control solenoid failure, Wiring issue
P2815	Transmission Control Module (TCM) failure, Transmission fluid level is low, Transmission pressure control solenoid failure, Wiring issue
P2A00	Exhaust leak, Oxygen sensor failure, Powertrain Control Module (PCM) failure, Wiring issue
P2A01	Exhaust leak, Oxygen sensor failure, Powertrain Control Module (PCM) failure, Wiring issue
P2A03	Exhaust leak, Oxygen sensor failure, Powertrain Control Module (PCM) failure, Wiring issue
P2A04	Exhaust leak, Oxygen sensor failure, Powertrain Control Module (PCM) failure, Wiring issue
P2BA8	Faulty NOx Sensors, NOx Sensors harness is open or shorted, NOx Sensors circuit poor electrical connection, Fualty Diesel Particulate Filter (DPF)
P3000	Fuel level is too low, High voltage battery assembly failure, High voltage battery is not sufficiently charged
P3100	High voltage powertrain control module failure
P3400	Faulty Cylinder Deactivation System/td>
P3401	Engine oil level is too low, Powertrain Control Module (PCM) failure, Variable valve timing solenoid failure, Wiring issue
B0081	Wiring issues, Control module problems, A problem with the airbag
C0040	A faulty wheel speed sensor, A problem with the wheel speed sensor circuit, Reluctor issues, A problem with the ABS module
U0001	A faulty wheel speed sensor, A problem with the wheel speed sensor circuit, Reluctor issues, A problem with the ABS module
U0073	A faulty control module, A problem with the CAN bus
U0100	A faulty PCM, A problem with the control module circuit, A problem with the CAN bus
U0107	A dead battery, A faulty TAC module, A problem with TAC module circuit, A problem with the CAN bus
U0121	A dead battery, A faulty ABS module, A problem with ABS module circuit, A problem with the CAN bus

The OBD2 port is usually located under the dashboard on the driver’s side.

3. Choosing the Right Acura OBD2 Scanner

3.1 Types of OBD2 Scanners

There are several types of OBD2 scanners available, each with its own features and capabilities:

• Basic Code Readers: These scanners are designed to read and clear OBD2 codes. They typically display the code and a brief description.
• Enhanced OBD2 Scanners: These scanners offer additional features, such as live data monitoring, freeze frame data, and the ability to perform some diagnostic tests.
• Professional-Grade Scanners: These scanners are used by professional mechanics and offer advanced features such as bidirectional control, advanced diagnostics, and programming capabilities.
• Smartphone-Based Scanners: These scanners consist of an OBD2 adapter that plugs into the vehicle and an app on your smartphone or tablet. They offer a range of features depending on the app and adapter.

3.2 Key Features to Consider

When choosing an OBD2 scanner for your Acura, consider the following features:

• Compatibility: Ensure the scanner is compatible with your Acura model and year.
• Ease of Use: Look for a scanner with an intuitive interface and clear instructions.
• Features: Determine which features are most important to you, such as live data, freeze frame data, and bidirectional control.
• Updateability: Choose a scanner that can be updated with the latest software and code definitions.
• Price: Set a budget and compare scanners within that price range.

3.3 Recommended Acura OBD2 Scanners

Here are a few recommended OBD2 scanners for Acura vehicles:

• Innova 3100i: A popular choice for DIYers, offering basic code reading, live data, and freeze frame data.
• Autel MaxiCOM MK808: A mid-range scanner with advanced features such as bidirectional control and special functions.
• BlueDriver Bluetooth Professional OBDII Scan Tool: A smartphone-based scanner that offers a wide range of features and is compatible with both iOS and Android devices.

A Bluetooth OBD2 scanner connects to your smartphone for easy diagnostics.

4. Advanced Diagnostics and Repairs with Acura OBD2 Scanners

4.1 Live Data Monitoring

Live data monitoring allows you to view real-time data from your Acura’s sensors and systems. This can be invaluable for diagnosing intermittent problems or identifying the root cause of a fault.

Common Live Data Parameters to Monitor:

• Engine RPM: Revolutions per minute of the engine.
• Vehicle Speed: Speed of the vehicle.
• Engine Load: Percentage of engine load.
• Coolant Temperature: Temperature of the engine coolant.
• Fuel Trim: Adjustments made to the fuel mixture.
• Oxygen Sensor Readings: Voltage output of the oxygen sensors.
• MAF Sensor Readings: Airflow readings from the MAF sensor.

4.2 Bidirectional Control

Bidirectional control allows you to send commands to the vehicle’s computer and activate certain components for testing purposes. This can be useful for diagnosing issues with actuators, solenoids, and other components.

Examples of Bidirectional Control Functions:

• Activating Fuel Injectors: Testing fuel injector function.
• Cycling ABS Pump: Testing the ABS pump and solenoids.
• Activating Cooling Fans: Testing the cooling fan operation.
• Resetting Adaptive Learning: Resetting the engine’s adaptive learning parameters.

4.3 Performing Diagnostic Tests

Many OBD2 scanners offer built-in diagnostic tests that can help you pinpoint the source of a problem.

Common Diagnostic Tests:

• Oxygen Sensor Test: Tests the function of the oxygen sensors.
• EGR System Test: Tests the function of the EGR (Exhaust Gas Recirculation) system.
• EVAP System Test: Tests the function of the EVAP (Evaporative Emission Control) system.
• Misfire Monitor: Monitors for engine misfires.

4.4 Using OBD2 Scanners for Maintenance

OBD2 scanners aren’t just for diagnosing problems; they can also be used for routine maintenance. For example, you can use a scanner to:

• Monitor Engine Health: Regularly check for pending codes that might indicate an issue developing.
• Verify Repairs: After performing maintenance or repairs, use the scanner to clear codes and ensure the issue is resolved.
• Check Emissions Readiness: Before an emissions test, use the scanner to