Engine-Codes - Chevrolet - P2138 CHEVROLET

P2138 CHEVROLET Code - Accelerator Pedal Position Sensor 1-2 Correlation

- Code Popularity: 121,635 Views
- Repair Importance Level: 3/3
- Repair Difficulty Level: 2/3
Table of contents

|What are the Possible Causes of the P2138 CHEVROLET Code?

  • 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 P2138 CHEVROLET Code?

Start by checking the "Possible Causes" listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector's pins.

|P2138 CHEVROLET code tech notes

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|What is the cost to diagnose the P2138 CHEVROLET code?

Labor: 1.0

The cost to diagnose the P2138 CHEVROLET code is 1.0 hour of labor. The auto repair's diagnosis time and labor rates vary by location, vehicle's make and model, and even your engine type. Most auto repair shops charge between $75 and $150 per hour.

|When is the P2138 CHEVROLET 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

|What are P2138 CHEVROLET code possible symptoms?

  • Engine Light ON (or Service Engine Soon Warning Light)

|What Does the P2138 CHEVROLET Code Mean?

The Accelerator Pedal Position (APP) sensor is made up of 2 sensors that are housed inside one assembly. The Engine Control Module (ECM) supplies a separate 5-volt reference circuit and a low reference circuit for each of the sensors. The 5-volt reference for APP sensor 1 is supplied from the same source in the ECM as the 5-volt reference for the mass air flow (MAF) sensor and the fuel tank pressure (FTP) sensor. The 5-volt reference voltage for all of the sensors is supplied on separate ECM terminals, but the terminals are connected internally to a voltage supply. The APP sensor 1 sends a signal from the sensor to the ECM indicating the accelerator pedal position. The ECM actuates the throttle plates based on this information. If the ECM detects that the APP sensors are not within a predicted value from each other, DTC P2138 sets.
Accelerator Pedal Position Sensor 1-2 Correlation

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