Powertrain, generic (extended)

P2C93 Hybrid/EV Battery Contactor Control Supply Circuit Range/Performance

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modePossible

With P2C93 the supply for the contactor drivers is present but does not behave as it should: it sags when a coil is switched on, ripples, or recovers too slowly before the next contactor in the closing sequence. A high-resistance contact or a weak feed therefore shows up here rather than as an open circuit. LG Energy Solution patent US12007445B2 describes the matching logic: before every contactor closes, the controller compares the supply with a minimum, waits and repeats the comparison if it is short, and only after a set number of failed tries records a supply fault. No manufacturer documents P2C93 publicly. For the driver the effect is often intermittent: the car may need several attempts to become ready or abort charging. CARB requires functional checks of hybrid components.

Likely causes

Corroded or loose contact in the supply feed causing voltage drop
Weak 12 V battery or ground connection sagging under coil load
Contactor coil drawing excessive current or driver stage faulty

Symptoms

  • Several attempts needed before the vehicle is ready
  • Charging stops unexpectedly
  • Intermittent hybrid or EV warning

Repair estimate

DifficultyHardWorkshop job
Parts and labour€50–3,000
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

P2C92P2C94P2C95P0AA0P0AE1

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