P0144low severityPowertrain
O2 Sensor Circuit High Voltage (Bank 1 Sensor 3)
on 2023 Chevrolet Bolt EUV 65 kWh Single Motor FWD · FWD
What this code means
The third oxygen sensor on bank 1 is reading a high voltage. This can indicate a rich condition or a wiring fault.
Symptoms
- Check engine light on
- Failed emissions test
- Poor fuel economy
Common causes
- Short to voltage in wiring
- Faulty oxygen sensor
- Contaminated sensor
- Corroded connector
Diagnostic steps
- Read O2 sensor voltage with scan tool
- Inspect wiring for shorts to voltage
- Check sensor for contamination
- Replace sensor if faulty
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