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2022 CHEVROLET BOLT EUV
65 kWh Single Motor FWD•FWD•AUTOMATIC•ev
4 active safety recalls on this vehicle — view recalls
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Repairs0Labor314Torque3680Fluid5DTC1608Battery1Maintenance0Recalls4
P0388moderate severityPowertrain

Auxiliary/Secondary Knock Sensor 2 Circuit High Input

on 2022 Chevrolet Bolt EUV 65 kWh Single Motor FWD · FWD

What this code means

The PCM detects an abnormally high voltage signal from the second knock sensor circuit. This can cause the engine to retard timing unnecessarily and reduce performance.

Symptoms

  • Reduced engine power
  • Check engine light on
  • Possible engine pinging

Common causes

  • Faulty knock sensor 2
  • Short to voltage in wiring
  • Corroded sensor connector
  • Failed PCM input circuit

Diagnostic steps

  1. Scan and record freeze frame data
  2. Inspect knock sensor 2 wiring and connector
  3. Measure sensor signal voltage with meter
  4. Replace knock sensor if out of spec
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