Throttle/Pedal Position Sensor "A" Low Input
The TPS signal voltage is below the lower acceptable threshold. The ECU usually enters limp-home mode and limits engine torque while the fault is active.
Affected components
- Throttle position sensor
- Throttle position sensor wiring
Common causes
- High likelihood: Signal wire shorted to ground
- Medium likelihood: TPS internally failed
- Low likelihood: 5V reference voltage to TPS missing
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
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.