Powertrain, generic (extended)

P2D4D Hybrid/EV Battery Pack I Over Temperature

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P2D4D is meant for section I, the ninth subdivision of a battery that is supervised section by section; no published battery has that many monitored groups, and no manufacturer documents the code. Where it is used, the reaction depends on how much margin the controller keeps. GM's 2019 table 19OBDG01 is an example of a tight setting for the whole pack: P0A7E fails once the hottest reading exceeds 54 °C for 5 s within a 6.3 s window, Type A. Fast charging, towing or long climbs in summer are the usual moments when such a limit is reached. CARB requires battery temperature inputs and cooling to be monitored. The battery management first lowers charge and discharge current; only if that does not help is a fault stored.

Likely causes

Heavy charging or discharging current (fast charging, towing, climbs) beyond cooling capacity
Reduced cooling at section I
Temperature sensor of section I reading high

Symptoms

  • Charging power drops sharply during fast charging
  • Reduced drive power with warning message
  • Check engine or EV system light

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 ibattery thermal managementbattery energy control module

Related codes

P2D4CP2D4EP2CCEP0A7E

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