P2138 2018 Toyota RAV4 Code - Throttle Pedal Position Sensor/Switch 'D'/'E' Voltage Correlation
Quick Answer
The Accelerator Pedal Position (APP) sensor is built into the accelerator pedal sensor assembly and has 2 sensor circuits: VPA (main) and VPA2 (sub). Common causes include Faulty Accelerator Pedal Position (APP) Sensor, Accelerator Pedal Position Sensor harness is open or shorted, Accelerator Pedal Position 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 2018 Toyota RAV4 indicates Throttle Pedal Position Sensor/Switch 'D'/'E' Voltage Correlation.
- Common causes
- Common causes include Faulty Accelerator Pedal Position (APP) Sensor, Accelerator Pedal Position Sensor harness is open or shorted, Accelerator Pedal Position 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 2018 Toyota RAV4 Description
The ECM monitors the actual accelerator pedal opening angle (throttle valve opening angle) through the signals from VPA and VPA2 and controls the throttle actuator according to these signals.
When either the output voltage of VPA or VPA2 deviates from the standard range, or the difference between the output voltages of the 2 sensor circuits is more than the threshold, the ECM determines that there is a malfunction in the accelerator pedal position sensor. The ECM then illuminates the MIL and stores a Diagnostic Trouble Code (DTC).
What are the Possible Causes of the DTC P2138 2018 Toyota RAV4?
- Faulty Accelerator Pedal Position (APP) Sensor
- Accelerator Pedal Position Sensor harness is open or shorted
- Accelerator Pedal Position Sensor circuit poor electrical connection
- Faulty Engine Control Module (ECM)
How to Fix the DTC P2138 2018 Toyota RAV4?
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 2018 Toyota RAV4 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 2018 Toyota RAV4 Code
1. What does the OBDII code P2138 mean on a 2018 Toyota RAV4?
P2138 indicates a voltage correlation issue between the Throttle Pedal Position Sensor/Switch 'D' and 'E', which monitor the accelerator pedal's position.
2. What are the common symptoms of code P2138 in a 2018 Toyota RAV4?
Common symptoms include reduced engine performance, the vehicle entering "limp mode," delayed acceleration, or the Check Engine Light turning on.
3. What causes the P2138 code in a 2018 Toyota RAV4?
Possible causes include a faulty accelerator pedal position sensor, damaged or corroded wiring/connectors, or a malfunctioning electronic throttle body.
4. Is it safe to drive a 2018 Toyota RAV4 with a P2138 code?
Driving with a P2138 code is not recommended, as the vehicle may enter limp mode, limiting speed and performance, and potentially causing unsafe driving conditions.
5. How do I diagnose the P2138 code in a 2018 Toyota RAV4?
Start by inspecting the accelerator pedal position sensor wiring and connectors for damage or corrosion. Use a scan tool to monitor sensor voltages and check for inconsistencies.
6. Can a dirty throttle body cause the P2138 code in a 2018 Toyota RAV4?
While a dirty throttle body is not a common cause, it can contribute to throttle-related problems. Cleaning it may help if other issues are ruled out.
7. How much does it cost to fix the P2138 code in a 2018 Toyota RAV4?
Repair costs vary depending on the cause. Replacing the accelerator pedal sensor typically costs $150-$400, including parts and labor.
8. Can I fix the P2138 code in my 2018 Toyota RAV4 myself?
If you're experienced with car repairs, you can inspect and replace the accelerator pedal sensor or repair damaged wiring. Otherwise, professional help is recommended.
9. What happens if I ignore the P2138 code in my 2018 Toyota RAV4?
Ignoring the code can lead to worsening driveability issues, reduced performance, and potential safety hazards due to unpredictable acceleration control.
10. Does resetting the ECU clear the P2138 code on a 2018 Toyota RAV4?
Resetting the ECU may temporarily clear the code, but if the underlying issue isn't resolved, the code and symptoms will return.
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