P2D4FHybrid/EV Battery Pack K 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
- P2D4F reports that section K, the eleventh supervised section of a high-voltage battery, has gone over its temperature limit; overheating and ageing of the same section are kept apart, the latter being P2CD0. No manufacturer documents P2D4F publicly. In a liquid-cooled pack, sections far from the coolant inlet see the warmest coolant, so a weak pump, a low level or air left in the loop after service tends to show up there first. GM's 2016 table 16OBDG01 still checks the whole pack against 73.5 °C with 50 failures in 67 samples at 100 ms, Type A, and suspends the test while voltage, current or temperature sensor faults are active. Under CARB, the cooling performance of the pack has to be checked in operation. The car protects the cells by cutting power.
- What you may notice
- Warning light, often under load or in summer
- Reduced electric drive and charging power
- Coolant pump or fan audible for a long time after driving
- Likely causes
- LikelyLow coolant level or air trapped in the battery loop, often after service
- PossibleWeak or intermittently failing battery coolant pump
- RareWorn modules in section K (compare with P2CD0)
- 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.