P2138 2008 Toyota Camry Code - Throttle Pedal Position Sensor/Switch 'D'/'E' Voltage Correlation
Quick Answer
The Accelerator Pedal Position (APP) sensor is mounted on the accelerator pedal to detect the angle of the accelerator pedal. Common causes include Faulty Accelerator Pedal Position (APP) Sensor, Accelerator Pedal Position (APP) Sensor harness is open or shorted, Accelerator Pedal Position (APP) 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 2008 Toyota Camry indicates Throttle Pedal Position Sensor/Switch 'D'/'E' Voltage Correlation.
- Common causes
- Common causes include Faulty Accelerator Pedal Position (APP) Sensor, Accelerator Pedal Position (APP) Sensor harness is open or shorted, Accelerator Pedal Position (APP) 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.
Code P2138 2008 Toyota Camry Description
In the accelerator pedal position sensor, the voltage applied to terminals VPA and VPA2 of the Engine Control Module (ECM) changes between 0 V and 5 V in proportion to the angle of the accelerator pedal. The VPA is a signal to indicate the actual accelerator pedal angle and is used for the engine control. VPA2 is used to detect malfunctions of the sensor itself.
The ECM monitors the accelerator pedal angle from VPA and VPA2 signal outputs, and controls the throttle motor based on these signals.
What are the Possible Causes of the DTC P2138 2008 Toyota Camry?
- Faulty Accelerator Pedal Position (APP) Sensor
- Accelerator Pedal Position (APP) Sensor harness is open or shorted
- Accelerator Pedal Position (APP) Sensor circuit poor electrical connection
- Faulty Engine Control Module (ECM)
How to Fix the DTC P2138 2008 Toyota Camry?
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.
Code Tech Notes
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P2138 2008 Toyota Camry 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.
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Frequently Asked Questions about P2138 2008 Toyota Camry Code
1. What does the OBDII code P2138 mean on a 2008 Toyota Camry?
P2138 indicates a voltage correlation issue between the throttle pedal position sensors 'D' and 'E', which may cause problems with the car's drive-by-wire throttle system.
2. What are the common symptoms of a P2138 code?
Symptoms may include reduced engine power, the throttle not responding properly, the check engine light illuminating, or the vehicle entering "limp mode."
3. What causes the P2138 code to appear?
Common causes include a faulty throttle pedal position sensor, damaged wiring or connectors, or a problem with the engine control module (ECM).
4. Can I drive my 2008 Toyota Camry with a P2138 code?
It’s not recommended. The car may enter limp mode, limiting power and making it unsafe to drive. Address the issue promptly to avoid potential hazards.
5. How is the P2138 code diagnosed?
Diagnosis involves using an OBDII scanner to confirm the code, inspecting the throttle pedal position sensor and related wiring, and checking for proper voltage signals.
6. How do I fix the P2138 code on my 2008 Toyota Camry?
Repairs may include replacing the throttle pedal position sensor, repairing or replacing damaged wiring and connectors, or, in rare cases, reprogramming the ECM.
7. How much does it cost to fix the P2138 code?
Costs vary but typically range from $150 to $300 for parts and labor if replacing the throttle pedal position sensor. Wiring repairs can cost less, depending on complexity.
8. Can a dirty throttle body cause a P2138 code?
No, a dirty throttle body is unlikely to cause this code since it specifically relates to the throttle pedal position sensors and their voltage correlation.
9. Will resetting the check engine light fix the P2138 code?
Clearing the code without addressing the underlying issue will only temporarily turn off the light. The code will return if the problem persists.
10. How can I prevent the P2138 code from occurring again?
Regularly inspect and maintain the throttle pedal assembly, check for damaged wiring, and avoid excessive water or moisture exposure to electronic components.
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