OBD-II code guide
P0123 Throttle Position Sensor Circuit High
P0123 means the throttle position signal is higher than expected.
What it means
The computer sees a throttle signal that may not match actual throttle opening.
Common symptoms
- Reduced engine power
- High idle
- Hesitation
- Poor acceleration
- Check engine light
Likely causes
- Throttle position sensor issue
- Throttle body fault
- Wiring short
- Connector problem
- Accelerator pedal correlation issue
First checks
- Do not force the throttle plate on electronic throttle bodies.
- Check for reduced power warnings.
- Inspect connector and wiring.
- Scan throttle position data.