Powertrain, generic (extended)

P2CD2 Hybrid/EV Battery Pack M Deterioration

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modePossible

P2CD2 flags section M, the thirteenth part of a sectioned high-voltage battery, as degraded in capacity or power. Unlike sections J to L, M has no matching over-temperature code in the available code lists, so the thermal history of this section has to be read from general pack temperature data. No manufacturer publicly documents P2CD2, and no published battery is divided into thirteen individually rated groups; Audi's Q5 PHEV with eight groups is the largest series on record. For cell and sensor faults and for cell balancing, CARB asks for separate codes per smallest replaceable unit; balancing failures are reported under other codes. Drivers notice less electric range and weaker response in electric mode, and the warning lamp comes on.

Likely causes

Section M degraded by age and charge cycles
Long standstill at low charge damaged cells of section M
Cell balancing of section M no longer working

Symptoms

  • Hybrid or engine warning lamp on
  • Reduced electric-only range
  • Sluggish response in electric mode

Repair estimate

DifficultyShop_onlyWorkshop job
Parts and labour€400–6,000
Time2–10 h

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

Parts involved

hv battery pack mbattery energy control module

Related codes

P2CD1P2CD3P0A7FP0BBD

References: law.cornell.edu, static.nhtsa.gov, static.nhtsa.gov.