P2D40Hybrid/EV Battery Cooling System C Performance
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- Needs a drive cycle to confirm a fix
- How the car detects it
- P2D40 is the functional check of the third cooling path of the traction battery. Ford uses it for the refrigerant chiller on the 2020–2023 Explorer, Aviator and Police Interceptor Utility hybrids (FHEV and PHEV); the code is stored in the secondary OBD module SOBDMC and lights the MIL. Bulletin 22-2342 tests the path: after the pack has warmed to at least 18 °C, maximum chiller flow is commanded for 2 minutes and the inlet coolant must drop by 3 °C; otherwise cooler fins, coolant pump and diverter valve are checked. On the road the chiller should engage above about 51 °C battery temperature on FHEV and 42 °C on PHEV. Ford lists squeezed hoses, trapped air, a refrigerant charge under 80 % of specification or a partly blocked cooler; SSM 51297 points to an updated workshop procedure. Other paths are P0C32 and P2D3F.
- What you may notice
- Malfunction indicator lamp on
- Battery temperature rises during hard driving or towing, power may be reduced
- Weak cabin air conditioning if the refrigerant charge is low
- Likely causes
- LikelyLow refrigerant charge in the A/C circuit feeding the battery chiller
- PossibleAir in the coolant or pinched, kinked battery coolant hoses
- PossiblePartly blocked battery chiller (high voltage battery cooler)
- PossibleCoolant diverter valve or battery coolant pump not delivering flow through the chiller
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Hard · Usually a job for a workshop.Typical cost: €100 – €1,800
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.