P2D93Starter/Generator Phase Y Current Sensor Circuit High
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- P2D93 reports that the current reading for phase Y of the starter/generator has climbed past its upper validity limit. Y is the middle letter of the X/Y/Z set this code series uses; the same list also has U/V/W variants (P2D9B to P2D9D), and no maker explains publicly how it assigns them. Not every design measures every phase. GM's eAssist belt system lists sensor circuit checks only for phases U and W, since with three phases one current can be calculated from the other two. A system that stores P2D93 therefore has a dedicated sensor on Y. No manufacturer documents this code publicly. Real phase currents do not get that high, so suspect a shorted signal lead, the sensor itself or the control module. P2D96 is the low fault, P2DC3 the general Y circuit code, P2DC4 the range check.
- What you may notice
- Hybrid or charging system warning on the instrument cluster
- Boost function during acceleration missing or reduced
- Engine restarts by the conventional starter or not at all after auto stop
- Likely causes
- LikelyPhase Y sensor signal lead chafed and touching a voltage-carrying wire
- PossibleInternal fault of the phase Y current sensor in the machine electronics
- RareDefective input stage in the starter/generator control module
- 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.