Powertrain, generic (extended)

P2CD1 Hybrid/EV Battery Pack L Deterioration

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modePossible

P2CD1 marks section L, the twelfth subdivision of the high-voltage pack, as worn: its usable capacity or power capability has fallen below what the controller accepts. The code only makes sense for packs whose management tracks twelve or more groups individually; no carmaker documents it publicly, and the largest published series, Audi's Q5 PHEV, ends with group 8. The Californian requirement that storage faults pinpoint the smallest replaceable unit explains why separate codes exist up to N. In the workshop, cell voltages of section L are compared with the rest both at rest and under load, and a balancing problem or a sensing fault (P0BBD, voltage variation) is excluded before a module is replaced. Overheating of this section is the separate code P2D50.

Likely causes

Section L has reached the end of its usable life
One weak cell block pulling the whole section down
Faulty voltage sensing making section L look weaker than it is

Symptoms

  • MIL illuminated
  • Battery charge falls faster than usual

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 lbattery energy control module

Related codes

P2CD0P2CD2P2D50P0BBD

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