Powertrain, generic (extended)

P2C92 Hybrid/EV Battery Contactor Control Supply Circuit/Open

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

The main contactors of a traction battery are relays whose coils are energised by driver stages in the battery controller, and those drivers take their energy from a dedicated supply feed. P2C92 means this feed is missing or interrupted, for example because of a blown fuse, a broken wire or a feed relay that does not pull in. Why the feed is watched at all is explained in LG Energy Solution patent US12007445B2: a coil voltage that is too weak or not yet settled can leave a contactor only partly closed, so the controller checks the supply before closing each contactor and declares a fault after repeated failed checks. No manufacturer documents P2C92 publicly. With the feed gone, no contactor can close, so the car typically refuses ready mode and charging. CARB requires monitoring of hybrid components.

Likely causes

Fuse in the contactor supply feed blown
Supply wire or connector at the battery pack interrupted
Relay or switch feeding the contactor drivers not closing
Battery controller input or driver stage defective

Symptoms

  • Vehicle does not become ready to drive
  • Charging does not start
  • Hybrid or EV system warning

Repair estimate

DifficultyHardWorkshop job
Parts and labour€30–3,000
Time0.5–6 h

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

Parts involved

hybrid battery contactor control supplywiring harnessbms

Related codes

P2C93P2C94P2C95P0AA0P0AA3

References: law.cornell.edu, patents.google.com.