AutoCodes – Honda – P2138 Honda

P2138 Honda Code - Accelerator Pedal Position Sensor A/B Incorrect Voltage Correlation

Quick Answer

Accelerator Pedal Position (APP) sensor A and Accelerator Pedal Position (APP) sensor B are potentiometers, and they are installed in the engine compartment. Common causes include Faulty Accelerator Pedal Position Sensor, Accelerator Pedal Position Sensor harness is open or shorted, Accelerator Pedal Position Sensor circuit poor electrical connection. 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 Honda indicates Accelerator Pedal Position Sensor A/B Incorrect Voltage Correlation.
Common causes: Common causes include Faulty Accelerator Pedal Position Sensor, Accelerator Pedal Position Sensor harness is open or shorted, Accelerator Pedal Position Sensor circuit poor electrical connection.
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 Popularity 111,788

How popular is this code, among other codes? Medium

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Intermediate (2 / 3)

What is this?

Table of contents Created and updated by William Orellana on Jun 14, 2020

Description
Step-by-Step Diagnostic Guide
Possible Causes
How To Fix
Tech Notes ▶
Cost to Diagnose
FAQs
Comments
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Code P2138 Honda Description

Accelerator Pedal Position (APP) sensor A and Accelerator Pedal Position (APP) sensor B are potentiometers, and they are installed in the engine compartment. Accelerator Pedal Position (APP) sensors A and B are operated via the throttle cable to determine the accelerator opening value when the driver presses the accelerator pedal. The accelerator pedal opening value is converted to a signal in APP sensors A and B and transmitted to the Powertrain Control Module (PCM) to compute the target position. The target position signal is transmitted to the throttle actuator control module via the circuit. APP sensor A is for the primary control, and APP sensor B is a back-up of APP sensor A in case it malfunctions. Both sensors compare their output voltage to each other for malfunction detection. When the voltage difference of APP sensor B is out of a fixed range for a set time, the PCM detects a malfunction, and a DTC is stored.

OBDII Code P2138 Honda - Accelerator Pedal Position Sensor A/B Incorrect Voltage Correlation - AutoCodes.com — P2138 Honda Code - Accelerator Pedal Position Sensor A/B Incorrect Voltage Correlation

What does this mean?

What are the Possible Causes of the DTC P2138 Honda?

Faulty Accelerator Pedal Position Sensor
Accelerator Pedal Position Sensor harness is open or shorted
Accelerator Pedal Position Sensor circuit poor electrical connection
Faulty Electric Throttle Control Actuator

How to Fix the DTC P2138 Honda?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What does this mean?

Code Tech Notes

User Submitted Video

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P2138 Honda code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the P2138 Honda code?

Need more information on how to fix the P2138 Honda code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P2138 Honda code diagnosed by a professional: Find a repair shop in your area

Information for Specific Honda Models

P2138 2008 Honda Accord — Accelerator Pedal Position Sensor 1/2 Incorrect Voltage
P2138 2009 Honda Accord — Accelerator Pedal Position Sensor 1/2 Incorrect Voltage
P2138 2010 Honda Accord — Accelerator Pedal Position Sensor 1/2 Incorrect Voltage

About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P2138 Honda Code

1. What are the common symptoms of OBDII code P2138 on a Honda?

The common symptoms include reduced engine power, hesitation or stalling when accelerating, and the vehicle going into limp mode.

2. What are the possible causes of OBDII code P2138 on a Honda?

The code P2138 typically indicates a problem with the accelerator pedal position sensor or the throttle position sensor. It could be due to a faulty sensor, wiring issues, or a problem with the throttle body.

3. How can I diagnose the issue causing OBDII code P2138 on my Honda?

Diagnosing the issue involves checking the wiring and connectors related to the accelerator pedal position sensor and throttle position sensor. It may also require testing the sensors themselves using a multimeter.

4. Can I drive my Honda with OBDII code P2138?

It is not recommended to drive your Honda with code P2138 as it can affect engine performance and potentially lead to safety issues. It's best to address the problem promptly.

5. How can I repair OBDII code P2138 on my Honda?

Repairing the issue may involve replacing the accelerator pedal position sensor, throttle position sensor, or repairing any damaged wiring. It's also important to clear the code after making the necessary repairs.

6. Are there any tips to prevent OBDII code P2138 from occurring again?

To prevent the recurrence of code P2138, ensure regular maintenance of the sensors and wiring, avoid harsh driving habits, and address any issues promptly to prevent further damage.

7. Can resetting the OBDII code P2138 on my Honda fix the problem?

Resetting the code may temporarily clear the warning light, but it will not fix the underlying issue causing code P2138. It's essential to diagnose and repair the problem to prevent it from coming back.

8. Will OBDII code P2138 affect fuel efficiency on my Honda?

Yes, code P2138 can affect fuel efficiency as it can lead to improper air-fuel mixture and engine performance issues. Resolving the code promptly can help restore optimal fuel efficiency.

9. How much does it typically cost to repair OBDII code P2138 on a Honda?

The cost of repairing code P2138 can vary depending on the extent of the issue, the parts needed for replacement, and labor costs. It's advisable to consult a professional mechanic for an accurate estimate.

10. Can I clear OBDII code P2138 on my Honda using an OBDII scanner?

Yes, you can clear code P2138 using an OBDII scanner, but it's crucial to address the underlying problem causing the code before clearing it. Otherwise, the issue may persist and trigger the code again.