P2DC2Starter/Generator Phase X 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
- P2DC2 means the starter/generator's phase X current sensor delivers values that are electrically valid but do not make sense. CARB requires such rationality faults to be detected where feasible and kept in a code of their own, separate from wiring and out-of-limit faults. One published method is the zero check: when the inverter is not switching, no phase current flows, so the reading should be near zero. GM's eAssist machine filters this offset over eight loops and treats more than 30 A as a fault on its U and W sensors, which GM files under the Range/Performance codes of drive motor A. No manufacturer documents P2DC2 publicly. A drifting sensor zero, a corrupted reference voltage or a sensor slowly failing are likely. Circuit fault: P2DC1; high and low: P2D92, P2D95.
- What you may notice
- Warning lamp after the plausibility check has failed on two trips
- Less electric torque because current control runs in a substitute mode
- Likely causes
- LikelyZero point of the phase X sensor drifted, for example through ageing or heat
- PossibleSensor reference voltage out of tolerance
- PossiblePhase X current sensor with gain error or slowly failing
- 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.