Powertrain, generic (extended)

P2D40 Hybrid/EV Battery Cooling System C Performance

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modePossible

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.

Likely causes

Low refrigerant charge in the A/C circuit feeding the battery chiller
Air in the coolant or pinched, kinked battery coolant hoses
Partly blocked battery chiller (high voltage battery cooler)
Coolant diverter valve or battery coolant pump not delivering flow through the chiller

Symptoms

  • 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

Repair estimate

DifficultyHardWorkshop job
Parts and labour€100–1,800
Time1–5 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

hv battery cooling system cbattery pack coolant loop

Related codes

P2D3FP0C32P0A7EP0C4A

References: static.nhtsa.gov, static.nhtsa.gov, law.cornell.edu.