P2D4EHybrid/EV Battery Pack J Over Temperature
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- P2D4E marks overheating of section J, the tenth separately judged part of a sectioned pack; its ageing counterpart is P2CCF. No manufacturer documents P2D4E publicly. The useful first step is to compare the temperatures of section J with those of its neighbours in live data. If only one sensor stands out while the others agree, a drifting sensor is more likely than real heat; GM's eAssist controller in table 13OBDG05C runs that kind of check under P0A9C, flagging a sensor that differs from the battery average by more than 8.55 °C, Type B. If the whole section is warm, look at its cooling and its modules. CARB asks for both: monitored temperature inputs and a working cooling system. Power is reduced until the reading drops.
- What you may notice
- Warning light with reduced electric power
- Section J temperature clearly above its neighbours in live data
- Charging limited
- Likely causes
- PossibleOne temperature sensor in section J drifting high while neighbours read normal
- PossibleRestricted cooling of section J
- RareWorn modules in section J (check P2CCF)
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Workshop only · Usually a job for a workshop.Typical cost: €100 – €4,000
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.