What P0123 means
Throttle/Petal Position Sensor/Switch A Circuit High Input
Common causes (general)
Before spending money on parts, verify the code with a scan tool and read freeze frame data. Freeze frame captures every sensor value at the moment the code set — this is often enough to figure out the root cause without further testing.
Manufacturer-specific descriptions
Different manufacturers use this code for slightly different failure modes. Here's what your specific make means by P0123:
| BMW | Throttle/Pedal Position Sensor/Switch "A" Circuit High |
| FORD | TP Sensor A Circuit High Input |
| HONDA | Throttle Position (TP) Sensor Circuit High Input |
| MITSUBISHI | Throttle/Pedal Position Sensor/Switch A Circuit High Input; TPS(main) high |
| NISSAN | Throttle/Pedal Position Sensor/Switch A Circuit High Input |
| VOLKSWAGEN | Throttle Position (TP) Sensor Circuit High Voltage |
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