Powertrain, generic (extended)

P2D4C Hybrid/EV Battery Pack H Over Temperature

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P2D4C stands for overheating of section H, the eighth monitored portion of a traction battery. Eight sections is also the largest split found in public service information, the Audi Q5 PHEV with groups 1 to 8, so H marks the edge of documented practice; Audi publishes only the ageing code P2CCD00 for its group 8, and no manufacturer documents P2D4C. Before suspecting the modules, look at the cooling system as a whole: CARB requires a functional check of battery cooling, which surfaces as separate cooling-performance codes such as P0C32, P2D3F and P2D40. If these are set too, the cause is the loop, not section H. GM's plug-in table 16OBDG02 shows a typical pack limit of 72 °C, 80 of 100 samples, Type A. Power drops until it cools.

Likely causes

Battery cooling loop fault (low coolant, pump, chiller, valve) affecting section H
Local flow restriction or poor cold-plate contact at section H
Worn module in section H (see P2CCD)

Symptoms

  • Warning lamp and possibly further battery cooling codes
  • Limited acceleration in electric mode
  • Charging stops or slows down

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 hbattery thermal managementbattery energy control module

Related codes

P2D4BP2D4DP2CCDP0C32P2D3F

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