P2138 2002 Toyota Highlander 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 2002 Toyota Highlander 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 2002 Toyota Highlander 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 2002 Toyota Highlander?
- 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 2002 Toyota Highlander?
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 is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P2138 2002 Toyota Highlander 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 2002 Toyota Highlander Code
1. What are the common symptoms of OBDII code P2138 in a 2002 Toyota Highlander?
- Common symptoms include a lack of throttle response, engine stalling, rough idling, and the vehicle going into limp mode.
2. What does the Throttle Pedal Position Sensor/Switch 'D'/'E' Voltage Correlation code P2138 mean on a 2002 Toyota Highlander?
- This code indicates that there is a discrepancy between the voltage signals coming from the throttle pedal position sensor and the throttle position sensor.
3. What are the possible causes of OBDII code P2138 in a 2002 Toyota Highlander?
- Possible causes include a faulty throttle pedal position sensor, a faulty throttle position sensor, wiring issues, or a problem with the electronic throttle control system.
4. How can I diagnose the cause of OBDII code P2138 in my 2002 Toyota Highlander?
- A thorough inspection of the throttle pedal position sensor, throttle position sensor, and their wiring is necessary. Using a multimeter to check voltage readings can help pinpoint the issue.
5. Can I still drive my 2002 Toyota Highlander with OBDII code P2138?
- It is not recommended to drive the vehicle with this code present, as it can lead to unsafe driving conditions and potential damage to the engine.
6. How can I repair OBDII code P2138 in my 2002 Toyota Highlander?
- Repairing this code may involve replacing the throttle pedal position sensor, throttle position sensor, or repairing any damaged wiring connections. It is recommended to consult a professional mechanic for proper diagnosis and repair.
7. Are there any preventative maintenance tips to avoid OBDII code P2138 in a 2002 Toyota Highlander?
- Regularly inspecting and cleaning the throttle pedal position sensor and throttle position sensor connections can help prevent issues that lead to this code.
8. Can a DIY enthusiast fix OBDII code P2138 in a 2002 Toyota Highlander?
- While some basic troubleshooting steps can be performed by a DIY enthusiast, diagnosing and repairing the root cause of this code may require specialized tools and expertise, so seeking professional help is advisable.
9. Will resetting the OBDII system clear the P2138 code in a 2002 Toyota Highlander?
- Resetting the system may temporarily clear the code, but if the underlying issue is not resolved, the code is likely to reappear once the problem is detected again.
10. How serious is OBDII code P2138 in a 2002 Toyota Highlander?
- OBDII code P2138 should be taken seriously, as it can lead to drivability issues and potential safety hazards. It is recommended to address this code promptly to avoid further complications.
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