P2DC3Starter/Generator Phase Y Current Sensor Circuit
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- P2DC3 flags an electrical fault in the circuit of the phase Y current sensor of the starter/generator. Such a sensor needs a supply, a ground and a signal line, and a break or short in any of the three can end up here when the controller cannot or does not tell high from low. Under CARB's rule the hybrid parts a manufacturer chooses to monitor are checked like any other input component, and the manufacturer has to get its hybrid monitoring plan approved. Not every machine has a Y sensor: GM's eAssist table covers only phases U and W, so a vehicle storing P2DC3 uses a different layout. No manufacturer documents P2DC3 publicly. Measure supply and ground at the sensor plug before condemning the machine. Range check: P2DC4; high and low: P2D93, P2D96.
- What you may notice
- MIL or hybrid warning
- Automatic stop-start disabled
- Battery charged less by the starter/generator
- Likely causes
- LikelyMissing supply or ground at the phase Y sensor
- PossibleOpen phase Y signal line between sensor and controller
- PossiblePhase Y current sensor without output
- 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.