P0164moderate severityPowertrain
O2 Sensor Circuit High Voltage (Bank 2 Sensor 3)
on 2023 Chevrolet Bolt EUV 65 kWh Single Motor FWD · FWD
What this code means
The PCM detects a persistently high voltage signal from bank 2, sensor 3 oxygen sensor. This may point to a rich condition or a wiring fault.
Symptoms
- Check engine light on
- Rough idle
- Failed emissions test
Common causes
- Faulty oxygen sensor
- Short to voltage in wiring
- Contaminated sensor
- Faulty PCM
Diagnostic steps
- Scan for stored codes and freeze frame
- Check O2 sensor signal voltage
- Inspect wiring for shorts to power
- Replace oxygen sensor if needed
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