P2138 Pontiac Code - Accelerator Pedal Position Sensor 1-2 Correlation
Quick Answer
The P2138 Pontiac diagnostic trouble code indicates a problem with the correlation between the accelerator pedal position sensor 1 and sensor 2. Common causes include Faulty accelerator pedal position sensors, Wiring or connector issues between the sensors and the ECM, ECM software or hardware problems. 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 Pontiac indicates Accelerator Pedal Position Sensor 1-2 Correlation.
- Common causes
- Common causes include Faulty accelerator pedal position sensors, Wiring or connector issues between the sensors and the ECM, ECM software or hardware problems.
- 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 Pontiac Description
The P2138 Pontiac diagnostic trouble code indicates a problem with the correlation between the accelerator pedal position sensor 1 and sensor 2. These sensors are responsible for monitoring the position of the accelerator pedal and sending this information to the engine control module (ECM). The ECM uses this data to adjust the engine's performance, fuel delivery, and other parameters to provide the desired acceleration.
Common Causes of P2138 Pontiac
- Faulty accelerator pedal position sensors.
- Wiring or connector issues between the sensors and the ECM.
- ECM software or hardware problems.
- Environmental factors such as moisture or corrosion affecting sensor operation.
- Mechanical issues with the accelerator pedal mechanism.
Symptoms of P2138 Pontiac
- Engine hesitation or lack of response when pressing the accelerator pedal.
- Surging or jerking while driving at a constant speed.
- Reduced fuel efficiency.
- Illumination of the Check Engine Light.
- Engine stalling or difficulty starting.
How to Fix P2138 Pontiac
- Diagnose the issue by using a scan tool to retrieve the trouble codes and data related to the accelerator pedal position sensors.
- Inspect the wiring harness and connectors for any signs of damage or corrosion. Repair or replace as needed.
- Test the accelerator pedal position sensors for proper operation and replace if faulty.
- Clear the trouble codes and perform a test drive to ensure the issue has been resolved.
- If the problem persists, further diagnostic testing may be required to identify any underlying issues with the ECM or other related components.
Cost to Fix P2138 Pontiac
The typical repair costs for addressing a P2138 Pontiac code can range from $200 to $500, including parts and labor. However, it's important to note that actual costs may vary depending on the specific vehicle make and model, as well as the location and labor rates of the auto repair shop. Diagnostic time and labor rates can also impact the overall cost of the repair. It's recommended to consult with a qualified mechanic or dealership for a more accurate estimate based on your individual circumstances.
When is the Code Detected?
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Frequently Asked Questions about P2138 Pontiac Code
1. What does the OBDII code P2138 mean on a Pontiac?
P2138 indicates a problem with the correlation between Accelerator Pedal Position (APP) Sensor 1 and Sensor 2, meaning their signals don’t match as expected.
2. What are the common symptoms of code P2138 on a Pontiac?
Symptoms include reduced engine power, the throttle not responding properly, the check engine light illuminating, and the vehicle possibly entering "limp mode."
3. What causes the P2138 code on a Pontiac?
Common causes include a faulty accelerator pedal position sensor, damaged wiring or connectors, corrosion in the circuits, or a problem with the throttle body.
4. Can I drive my Pontiac with the P2138 code active?
It’s not recommended to drive with this code active, as the vehicle may experience reduced power or throttle failure, which can compromise safety.
5. How do you troubleshoot the P2138 code?
Start by inspecting the accelerator pedal assembly, checking the wiring and connectors for damage or corrosion, and using a scan tool to monitor the APP sensor signals.
6. Does the P2138 code always mean the accelerator pedal sensor is faulty?
No, the issue could also be related to wiring, connectors, or even the throttle body, so a thorough diagnosis is necessary.
7. How much does it cost to repair the P2138 code on a Pontiac?
Repair costs vary but typically range from $100 to $300, depending on whether the sensor, wiring, or throttle body needs replacement.
8. Can a dirty throttle body cause the P2138 code?
Yes, a dirty or malfunctioning throttle body can sometimes contribute to the code if throttle response is affected.
9. How do you fix the P2138 code on a Pontiac?
Repairs may include replacing the accelerator pedal position sensor, repairing damaged wiring, cleaning connectors, or addressing issues with the throttle body.
10. Will clearing the code fix the P2138 issue?
Clearing the code may temporarily turn off the check engine light, but the underlying issue must be resolved to prevent the code from returning.
Discuss the causes and fixes for P2138 Pontiac OBDII Code
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I get a 04 grand prix gtp I just put the motor and trans in the car and now I'm getting a code p2138 it won't let me accelerate it wasn't duing that before I did the engine trans I check everything runing out of time
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Start by checking the connectors at the accelerator pedal. If the connector are OK, check all the harness connector in the engine compartment. There is a engine harness in the engine compartment that carries the signal from Accelerator Pedal Position to the CPM
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