Powertrain, generic · Hybrid propulsion

P0D08 Battery Charging System Positive Contactor A Stuck Closed

Check engine lightOn
EmissionsNot relevant
Drive cycleNot required
Limp modePossible

P0D08 means positive charging contactor A has stayed closed although the control module commanded it open, typically because the contacts have welded. The module notices this when voltage remains on the charging side, for instance at the charge port once a session has ended, as a Toyota patent on charge-relay sticking explains. GM stores P0D08 in the BECM of the 2023 Cadillac Lyriq; bulletin 23-NA-096 traces a joint setting with P0D0F to a software fault after an interrupted level 2 AC session and confirms it with a one-minute test charge. Stellantis lists P0D08-00 for the 2024–2025 Ram ProMaster EV with MIL and a vehicle that may not enable, remedied by BPCM reflash. The negative side is P0D0F, the opposite fault P0D09. A live inlet is a safety risk, so charging or driving gets locked out.

Likely causes

Contactor contacts welded, for example after switching under load
Battery module software misjudging the contactor state (GM Lyriq, Ram ProMaster EV bulletins)
Driver stage or coil supply that does not switch off

Symptoms

  • Malfunction indicator lamp and high-voltage service message
  • Charging refused
  • Vehicle may not switch to ready mode

Repair estimate

DifficultyShop_onlyWorkshop job
Parts and labour€100–2,500
Time0.5–6 h

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

Parts involved

bcs pos contactor awiring harnessbms

Related codes

P0D07P0D09P0D0FP0AA1

References: static.nhtsa.gov, static.nhtsa.gov, patents.google.com, patents.google.com.