P2D4BHybrid/EV Battery Pack G 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
- P2D4B reports overheating in section G, the seventh separately supervised part of the traction battery. Such a letter only makes sense for big packs with many groups. The Audi Q5 PHEV is a documented example of such a split: its hybrid battery unit 008C reports eight battery groups through the deterioration codes P0A7F00 to P2CCD00, group 7 being P2CCC00, and Audi bulletins 2076982/1 and 2079556/1 of 2025 deal with replacing single modules. Those bulletins cover ageing only; no manufacturer documents P2D4B. For battery components such as cells and temperature sensors, CARB requires codes that isolate the smallest unit replaceable in service. Before a module is changed, the cooling circuit for section G should be checked, since overheating alone is not proof of a worn module.
- What you may notice
- Engine or hybrid warning lamp
- Displayed electric range shorter than usual
- Reduced charging power
- Likely causes
- LikelyInsufficient cooling of section G (coolant distribution, trapped air, pump)
- PossibleWorn module in section G (compare with P2CCC)
- RareTemperature sensor of section G reading too 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.