Throttle/Pedal Position Sensor "A"/"B" Voltage Correlation
The two redundant throttle position sensors on the throttle body disagree by more than allowed. Distinct from P2138 which monitors the pedal pair — P2135 monitors the throttle-body pair on drive-by-wire systems.
Affected components
- Throttle position sensor
- Throttle body
Common causes
- High likelihood: Throttle position sensor track worn
- Medium likelihood: Corrosion on throttle body connector
Possible symptoms
- Check engine light on
- Reduced throttle response, possible limp mode
- Hesitation or surging
- Idle too high or too low
Diagnostic notes
- The malfunction indicator lamp may illuminate
- This code can affect emissions
- A drive cycle may be required after repair
- Reduced-power or limp mode may occur
Related codes
Sources
Diagnostic information is provided for reference only. Confirm the code with a compatible scan tool and follow the vehicle manufacturer's service procedures before replacing components.