P2138 Acura Code - Accelerator Pedal Position Sensor A/B Incorrect Voltage Correlation
Quick Answer
The P2138 diagnostic trouble code (DTC) for Acura vehicles refers to an issue with the Accelerator Pedal Position Sensor A/B Incorrect Voltage Correlation. Common causes include Faulty Accelerator Pedal Position Sensor: One of the sensors may be malfunctioning or sending incorrect signals to the ECM, Wiring Issues: Corroded, damaged, or loose wiring connections between the sensors and the ECM can disrupt the voltage signals, ECM Malfunction: A problem with the Engine Control Module itself can also lead to the P2138 code being triggered. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
- What it means
- P2138 Acura indicates Accelerator Pedal Position Sensor A/B Incorrect Voltage Correlation.
- Common causes
- Common causes include Faulty Accelerator Pedal Position Sensor: One of the sensors may be malfunctioning or sending incorrect signals to the ECM, Wiring Issues: Corroded, damaged, or loose wiring connections between the sensors and the ECM can disrupt the voltage signals, ECM Malfunction: A problem with the Engine Control Module itself can also lead to the P2138 code being triggered.
- Severity
- High - diagnose this code as soon as possible.
- Can I drive?
- Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
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Code P2138 Acura Description
The P2138 diagnostic trouble code (DTC) for Acura vehicles refers to an issue with the Accelerator Pedal Position Sensor A/B Incorrect Voltage Correlation. This code indicates that there is a discrepancy between the signals being sent by two separate sensors that monitor the position of the accelerator pedal. In modern vehicles, the accelerator pedal no longer directly controls the throttle body but instead sends electronic signals to the Engine Control Module (ECM) to adjust the throttle opening.
Common Causes of P2138 Acura
- Faulty Accelerator Pedal Position Sensor: One of the sensors may be malfunctioning or sending incorrect signals to the ECM.
- Wiring Issues: Corroded, damaged, or loose wiring connections between the sensors and the ECM can disrupt the voltage signals.
- ECM Malfunction: A problem with the Engine Control Module itself can also lead to the P2138 code being triggered.
- Throttle Body Issues: A dirty or malfunctioning throttle body can affect the correlation between the accelerator pedal position sensors.
- Environmental Factors: Extreme temperatures, moisture, or other environmental conditions can also impact the sensors' performance.
Symptoms of P2138 Acura
- Check Engine Light: The most common symptom associated with the P2138 code is the illumination of the check engine light on the dashboard.
- Reduced Acceleration: Drivers may experience a lack of power or sluggish acceleration when pressing the accelerator pedal.
- Rough Idle: The engine may idle roughly or inconsistently due to the incorrect signals from the accelerator pedal position sensors.
- Stalling: In severe cases, the vehicle may stall or have difficulty starting, especially when trying to accelerate from a standstill.
- Reduced Fuel Efficiency: The incorrect voltage correlation can lead to inefficient fuel delivery, causing a decrease in fuel efficiency over time.
How to Fix P2138 Acura
- Diagnose the Issue: Use a diagnostic scanner to retrieve the trouble codes and perform a thorough inspection of the accelerator pedal position sensors, wiring, and ECM.
- Replace Faulty Sensors: If one or both of the sensors are found to be faulty, replace them with new OEM parts.
- Repair Wiring Connections: Inspect the wiring harness for any damage or corrosion, repair or replace any faulty connections.
- Test and Calibrate: After replacing sensors or repairing wiring, test the system and calibrate the accelerator pedal position sensors as needed.
- Clear Codes and Test Drive: Clear the trouble codes from the ECM, reset the system, and take the vehicle for a test drive to ensure the issue has been resolved.
Cost to Fix P2138 Acura
The cost of repairing the P2138 code in an Acura vehicle can vary depending on the extent of the issue, the parts needed, and labor rates in your area. Typically, the cost of replacing the accelerator pedal position sensors and repairing wiring connections can range from $200 to $500. Additional costs may apply if the ECM needs to be replaced or if other components require attention. It's recommended to consult with a professional mechanic or dealership for a more accurate estimate based on your specific vehicle and location. Labor rates at auto repair shops typically range from $80 to $150 per hour, but these rates can vary based on various factors.
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Frequently Asked Questions about P2138 Acura Code
1. What are the common symptoms of OBDII code P2138 in an Acura?
The common symptoms of OBDII code P2138 in an Acura include loss of power, hesitation or stumbling during acceleration, and the vehicle going into limp mode.
2. What are the possible causes of OBDII code P2138 in an Acura?
The possible causes of OBDII code P2138 in an Acura are a faulty accelerator pedal position sensor, issues with the throttle position sensor, wiring or connector problems, or a malfunctioning electronic throttle control system.
3. How can I diagnose the cause of OBDII code P2138 in my Acura?
To diagnose the cause of OBDII code P2138 in your Acura, you can use a scan tool to check for any related trouble codes, inspect the wiring and connectors for damage or loose connections, and test the accelerator pedal position sensor and throttle position sensor using a multimeter.
4. Can I continue driving my Acura with OBDII code P2138?
It is not recommended to continue driving your Acura with OBDII code P2138, as it can lead to further damage to the engine or transmission. It is best to address the issue promptly to avoid any safety hazards.
5. How can I repair OBDII code P2138 in my Acura?
To repair OBDII code P2138 in your Acura, you may need to replace the accelerator pedal position sensor, throttle position sensor, or repair any damaged wiring or connectors. It is recommended to follow the manufacturer's repair procedures outlined in the service manual.
6. Is it possible to reset OBDII code P2138 in an Acura without fixing the underlying issue?
While you can clear the OBDII code P2138 using a scan tool, it is not advisable to do so without fixing the underlying issue. The code is likely to reappear if the root cause is not addressed, and the vehicle may continue to exhibit performance issues.
7. How long does it typically take to repair OBDII code P2138 in an Acura?
The time it takes to repair OBDII code P2138 in an Acura can vary depending on the specific cause of the issue and the availability of replacement parts. In general, it may take a few hours to a day to diagnose and repair the problem.
8. Can a DIY enthusiast fix OBDII code P2138 in an Acura?
While some DIY enthusiasts may have the skills and tools necessary to diagnose and repair OBDII code P2138 in an Acura, it is recommended to have the issue addressed by a professional mechanic to ensure proper diagnosis and repair.
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