P1123moderate severityPowertrain
TP Sensor Circuit Intermittent High Voltage
on 2023 Chevrolet Bolt EUV 65 kWh Single Motor FWD · FWD
What this code means
The throttle position sensor signal briefly spiked too high. Usually a wiring short or failing sensor.
Symptoms
- Check engine light on
- Surging or stumble
- Erratic throttle response
Common causes
- Short to voltage in wiring
- Faulty TP sensor
- Corroded connector
- Bad PCM input
Diagnostic steps
- Scan and monitor TP sensor voltage
- Wiggle-test harness and connector
- Check signal wire for short to voltage
- Replace TP sensor if faulty
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