Powertrain, generic (extended)

P2D3F Hybrid/EV Battery Cooling System B Performance

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modePossible

P2D3F is the functional check of a second cooling path of the traction battery, alongside A (P0C32) and C (P2D40). Which path carries which letter is the manufacturer's choice; packs may be cooled by air, by a coolant radiator or by a refrigerant chiller, and some switch between them. No manufacturer documents P2D3F publicly. CARB requires a cooling performance check where feasible, and published tests show the principle: GM's 2012 Volt fails its battery cooling check under P0C32 when the average pack temperature stays above 40 °C during active cooling, Type A. Ford, which uses letter C for the chiller path of its Explorer and Aviator hybrids, tests that path by commanding maximum chiller flow and expecting the inlet coolant to fall by 3 °C. Expect reduced power or charging when the pack runs hot.

Likely causes

Low coolant or trapped air in the battery loop
Blocked radiator, cooler or air duct of this cooling path
Diverter valve or pump that does not route enough flow through path B
Coolant or cell temperature sensor reading wrong

Symptoms

  • Malfunction indicator lamp or hybrid system warning on
  • Reduced electric power or slower fast charging in hot weather

Repair estimate

DifficultyHardWorkshop job
Parts and labour€80–1,500
Time0.5–4 h

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

Parts involved

hv battery cooling system bbattery pack coolant loop

Related codes

P0C32P2D40P0A7EP0C4A

References: law.cornell.edu, gsi.ext.gm.com, static.nhtsa.gov.