OBD-II code · Powertrain (generic, extended)
P2D40 Hybrid/EV Battery Cooling System C Performance
The hybrid battery cooling system C does not maintain target temperatures under load. Coolant flow, radiator fouling, or pump output reduced on this branch.
Is it safe to drive with P2D40?
The car may go into limp mode (reduced power). Get it diagnosed before a long trip.
Common causes
- Most likelyRadiator fins fouled - reduced heat rejection
- PossiblePump output degraded with age
- Less likelyPack cell imbalance approaching service threshold
Symptoms
- EV/hybrid system warning light on
- Reduced power output or limp mode
- Charging may fail or be slowed
- Reduced electric range
Repair at a glance
- Difficulty
- Hard
- DIY friendly
- Best left to a mechanic
- Typical labour
- 2–7 h
- Emissions test
- Usually unaffected
- Parts involved
- Hybrid Battery Cooling System C, Battery Pack Coolant Loop
Related codes
- P0C32Hybrid/EV Battery Cooling System A Performance
- P2D3FHybrid/EV Battery Cooling System B Performance
- P2D3DCold Start Hybrid/EV Drive Motor Inverter Torque Performance
- P2D3ECold Start Hybrid/EV Battery Performance
- P2D41A/C Compressor Motor Voltage B Performance
- P2D42A/C Compressor Motor Voltage B Low
- P2D43A/C Compressor Motor Voltage B High
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.