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Engine-Codes – Saturn – P2138 2005 Saturn Ion

P2138 2005 Saturn Ion Code - Accelerator Pedal Position Sensor 1-2 Correlation

Quick Answer

The P2138 diagnostic trouble code (DTC) for a 2005 Saturn Ion refers to the Accelerator Pedal Position Sensor 1-2 Correlation. Common causes include Faulty accelerator pedal position sensor, Wiring issues or loose connections, ECM malfunction. 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 2005 Saturn Ion indicates Accelerator Pedal Position Sensor 1-2 Correlation.
Common causes
Common causes include Faulty accelerator pedal position sensor, Wiring issues or loose connections, ECM malfunction.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 11, 2024
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Code P2138 2005 Saturn Ion Description

The P2138 diagnostic trouble code (DTC) for a 2005 Saturn Ion refers to the Accelerator Pedal Position Sensor 1-2 Correlation. This code indicates that there is a discrepancy between the signals received from two accelerator pedal position sensors in the vehicle. In modern vehicles, the accelerator pedal position sensor is responsible for informing the engine control module (ECM) of how much acceleration the driver is requesting. The ECM uses this information to adjust the fuel injection and ignition timing to deliver the appropriate amount of power to the engine.

OBDII Code P2138 2005 Saturn Ion - Accelerator Pedal Position Sensor 1-2 Correlation
P2138 2005 Saturn Ion Code - Accelerator Pedal Position Sensor 1-2 Correlation

Common Causes of P2138 2005 Saturn Ion

  1. Faulty accelerator pedal position sensor
  2. Wiring issues or loose connections
  3. ECM malfunction
  4. Corrosion in the sensor connections
  5. Water or moisture damage to the sensor

Symptoms of P2138 2005 Saturn Ion

  1. Poor acceleration
  2. Hesitation during acceleration
  3. Stalling
  4. Rough idling
  5. Limp mode activation

How to Fix P2138 2005 Saturn Ion

  1. Begin by conducting a visual inspection of the accelerator pedal position sensors and their wiring connections.
  2. Test the sensors using a multimeter to check for proper voltage and resistance readings.
  3. Replace any faulty accelerator pedal position sensors or repair wiring issues as needed.
  4. Clear the DTC using an OBD-II scanner and test drive the vehicle to ensure the issue has been resolved.

Cost to Fix P2138 2005 Saturn Ion

The cost estimate for repairing the Accelerator Pedal Position Sensor 1-2 Correlation issue can vary depending on the specific cause of the problem and the labor rates in your area. Typically, the cost of replacing an accelerator pedal position sensor ranges from $100 to $200, including parts and labor. Additional costs may apply if there are wiring issues or ECM malfunctions that need to be addressed. It is advisable to consult with a professional mechanic to get an accurate estimate based on your vehicle's make and model.

When is the Code Detected?

The Engine Control Module (ECM) has detected that the APP sensor 1 and APP sensor 2 disagree more than 4.5 percent for less than 1 second

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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 2005 Saturn Ion Code

1. What are the common symptoms of OBDII code P2138 on a 2005 Saturn Ion related to the Accelerator Pedal Position Sensor 1-2 Correlation?

- Common symptoms include reduced engine power, hesitation or stalling when accelerating, and the vehicle going into "limp mode."

2. What could be the possible causes of OBDII code P2138 on a 2005 Saturn Ion?

- The code P2138 typically indicates a correlation issue between the two accelerator pedal position sensors, a faulty accelerator pedal position sensor, wiring or connector issues, or a problem with the throttle body.

3. How can I diagnose and repair OBDII code P2138 on my 2005 Saturn Ion?

- To diagnose the issue, you may need to use a scan tool to monitor the readings of the accelerator pedal position sensors and the throttle body. Repair may involve replacing the faulty sensor, repairing damaged wiring or connectors, or cleaning/replacing the throttle body.

4. Is it safe to continue driving my 2005 Saturn Ion with OBDII code P2138 active?

- It is not recommended to continue driving the vehicle with the code P2138 active, as it can lead to unsafe driving conditions and potential further damage to the vehicle.

5. Can I reset the OBDII code P2138 on my 2005 Saturn Ion without fixing the underlying issue?

- While you can clear the code with a scan tool, it is important to address the root cause of the problem to prevent the code from reoccurring and ensure the vehicle functions properly.

6. How much does it typically cost to repair OBDII code P2138 on a 2005 Saturn Ion?

- The cost of repairing OBDII code P2138 can vary depending on the exact cause of the issue, but it may range from $100 to $300 for parts and labor.

7. Are there any preventative measures I can take to avoid OBDII code P2138 on my 2005 Saturn Ion in the future?

- Regular maintenance and inspections of the accelerator pedal position sensors, wiring, and throttle body can help prevent issues that may trigger the P2138 trouble code.

8. Will OBDII code P2138 on a 2005 Saturn Ion affect fuel efficiency?

- Yes, the code P2138 can impact fuel efficiency as the vehicle may not be able to regulate the air-fuel mixture properly, leading to inefficient combustion.

9. Can a DIY enthusiast with basic automotive knowledge repair OBDII code P2138 on a 2005 Saturn Ion?

- Depending on the exact cause of the issue, some DIY enthusiasts may be able to address the problem by replacing the accelerator pedal position sensor or checking and repairing wiring issues. However, more complex repairs involving the throttle body may require professional assistance.

10. How long does it typically take to repair OBDII code P2138 on a 2005 Saturn Ion?

- The repair time for OBDII code P2138 can vary based on the specific cause of the issue and the expertise of the mechanic, but it may take anywhere from 1 to 3 hours to diagnose and repair the problem.

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