Powertrain, generic (extended)

P2D4E Hybrid/EV Battery Pack J Over Temperature

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P2D4E marks overheating of section J, the tenth separately judged part of a sectioned pack; its ageing counterpart is P2CCF. No manufacturer documents P2D4E publicly. The useful first step is to compare the temperatures of section J with those of its neighbours in live data. If only one sensor stands out while the others agree, a drifting sensor is more likely than real heat; GM's eAssist controller in table 13OBDG05C runs that kind of check under P0A9C, flagging a sensor that differs from the battery average by more than 8.55 °C, Type B. If the whole section is warm, look at its cooling and its modules. CARB asks for both: monitored temperature inputs and a working cooling system. Power is reduced until the reading drops.

Likely causes

One temperature sensor in section J drifting high while neighbours read normal
Restricted cooling of section J
Worn modules in section J (check P2CCF)

Symptoms

  • Warning light with reduced electric power
  • Section J temperature clearly above its neighbours in live data
  • Charging limited

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 jbattery thermal managementbattery energy control module

Related codes

P2D4DP2D4FP2CCFP0A9CP0A7E

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