P2D4DHybrid/EV Battery Pack I 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
- P2D4D is meant for section I, the ninth subdivision of a battery that is supervised section by section; no published battery has that many monitored groups, and no manufacturer documents the code. Where it is used, the reaction depends on how much margin the controller keeps. GM's 2019 table 19OBDG01 is an example of a tight setting for the whole pack: P0A7E fails once the hottest reading exceeds 54 °C for 5 s within a 6.3 s window, Type A. Fast charging, towing or long climbs in summer are the usual moments when such a limit is reached. CARB requires battery temperature inputs and cooling to be monitored. The battery management first lowers charge and discharge current; only if that does not help is a fault stored.
- What you may notice
- Charging power drops sharply during fast charging
- Reduced drive power with warning message
- Check engine or EV system light
- Likely causes
- PossibleHeavy charging or discharging current (fast charging, towing, climbs) beyond cooling capacity
- PossibleReduced cooling at section I
- RareTemperature sensor of section I reading high
- 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.