P06B6Internal Control Module Knock/Combustion Vibration Sensor Processor 1 Performance
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Needs a drive cycle to confirm a fix
- How the car detects it
- To detect an open knock sensor circuit, GM's engine modules feed a 20 kHz test signal into the sensor circuit and check whether it returns. P06B6 checks the internal test circuit or knock signal processor for sensor 1: it sets when the returned 20 kHz component lies between the open-circuit thresholds, so the module cannot decide 'connected' or 'open'. GM rates it type B (two trips), type A in some 2025 modules; Saab retards ignition timing as a reaction. GM bulletin 22-NA-229 calls for reprogramming only, not part replacement. Ford uses P06B6 for lost communication with its knock chip (more than 200 cylinder events). Knock sensor circuit codes are P0325–P0328.
- What you may notice
- Check engine light
- Retarded ignition, less power and higher consumption
- Often no other symptoms
- Likely causes
- LikelyEngine module software (GM bulletin)
- PossibleInternal knock processor or test circuit faulty
- PossibleKnock sensor wiring with high resistance or intermittent contact
- RareKnock sensor faulty
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Usually a job for a workshop.Typical cost: €0 – €1,200
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.