P2D4CHybrid/EV Battery Pack H 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
- P2D4C stands for overheating of section H, the eighth monitored portion of a traction battery. Eight sections is also the largest split found in public service information, the Audi Q5 PHEV with groups 1 to 8, so H marks the edge of documented practice; Audi publishes only the ageing code P2CCD00 for its group 8, and no manufacturer documents P2D4C. Before suspecting the modules, look at the cooling system as a whole: CARB requires a functional check of battery cooling, which surfaces as separate cooling-performance codes such as P0C32, P2D3F and P2D40. If these are set too, the cause is the loop, not section H. GM's plug-in table 16OBDG02 shows a typical pack limit of 72 °C, 80 of 100 samples, Type A. Power drops until it cools.
- What you may notice
- Warning lamp and possibly further battery cooling codes
- Limited acceleration in electric mode
- Charging stops or slows down
- Likely causes
- LikelyBattery cooling loop fault (low coolant, pump, chiller, valve) affecting section H
- PossibleLocal flow restriction or poor cold-plate contact at section H
- RareWorn module in section H (see P2CCD)
- 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.