Powertrain, generic (extended)

P2C94 Hybrid/EV Battery Contactor Control Supply Circuit Low

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P2C94 says the supply feeding the contactor drivers lies below its lower limit. Ford is the maker that documents it: special service messages 51513 and 51783 (2023) describe 2021–2023 Escape, Corsair, Aviator, Mustang Mach-E, F-150 and Transit plug-in models whose AC charging at level 1 or 2 stops with the MIL on and P2C94 logged in the SOBDM, the on-board charger module. As a stopgap the charge handle is unplugged and reconnected; a new SOBDM does not help. TSB 23-2399, extended by 24-2027 to the 2023 E-Transit, blames SOBDM software and cures it by reprogramming. Ford does not say which supply it measures. On other vehicles a genuinely low feed, as described in patent US12007445B2, can stop contactors closing fully. Compare P2C95 for the high side.

Likely causes

On-board charger (SOBDM) software, Ford TSB 23-2399/24-2027
Supply feed pulled down by a weak 12 V battery or poor ground
Partial short or high resistance in the supply wiring

Symptoms

  • AC charging stops while plugged in, MIL on
  • Charging resumes after unplugging and reconnecting
  • Vehicle may not become ready to drive

Repair estimate

DifficultyShop_onlyWorkshop job
Parts and labour€0–2,500
Time0.5–4 h

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

Parts involved

hybrid battery contactor control supplywiring harnessbmson board charger

Related codes

P2C92P2C93P2C95P0ADFP0E6A

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