Powertrain, generic (extended)

P2D4F Hybrid/EV Battery Pack K Over Temperature

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

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.

Likely causes

Low coolant level or air trapped in the battery loop, often after service
Weak or intermittently failing battery coolant pump
Worn modules in section K (compare with P2CD0)

Symptoms

  • 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

Repair estimate

DifficultyShop_onlyWorkshop job
Parts and labour€100–4,000
Time1–10 h

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

Parts involved

hv battery pack kbattery thermal managementbattery energy control module

Related codes

P2D4EP2D50P2CD0P0C47P0A7E

References: law.cornell.edu, gsi.ext.gm.com.