P2DC6Starter/Generator Phase Z Current Sensor Circuit Range/Performance
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- P2DC6 is the plausibility code for the starter/generator's phase Z current sensor. The reading stays within its electrical window but does not match what the controller expects from commanded current and machine state. Care is needed to separate this from a real winding problem: GM's eAssist logic, for example, watches the peak current of each phase as the rotor turns and stores a separate open-phase code when it stays under 9 A although at least 25 A are commanded. A low Z value can thus mean a weak sensor or a phase that truly carries little current. CARB demands rationality faults in their own code, apart from circuit faults. No manufacturer documents P2DC6 publicly. Circuit: P2DC5; Z high and low: P2D94, P2D97; phase correlation: P2DCB.
- What you may notice
- Warning lamp, usually after two trips
- Reduced starter/generator output or rough automatic restarts
- Likely causes
- LikelyPhase Z sensor has lost sensitivity or drifted
- PossibleReal current deviation from a poor phase Z connection or winding fault
- RareController software or calibration judging the signal wrongly
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Hard · Usually a job for a workshop.Typical cost: €150 – €2,000
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.