P0053low severityPowertrain
HO2S Heater Resistance (Bank 1 Sensor 1)
on 2023 Chevrolet Bolt EUV 65 kWh Single Motor FWD · FWD
What this code means
The heater element resistance of the upstream oxygen sensor on bank 1 is out of specification. This can slow sensor light-off and closed-loop entry.
Symptoms
- Check engine light on
- Delayed closed-loop operation
- Failed emissions readiness
Common causes
- Aged or faulty O2 sensor heater
- Corroded connector
- Wiring resistance issue
- Failed PCM driver
Diagnostic steps
- Scan and confirm code
- Measure heater element resistance
- Compare to specification
- Inspect wiring and connectors
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