Powertrain, generic · Hybrid propulsion

P0C49 Hybrid/EV Battery Pack Coolant Pump A Control Circuit High

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P0C49 is set when the control signal to battery coolant pump A remains too high, for example because the line is shorted to battery voltage or, on a pulled-up input, interrupted. Ford uses it on the 2020 Explorer, Police Interceptor Utility and Lincoln Aviator hybrids. Bulletins 20-2293 and 20-2345 list it right after P0C48 among a group of MIL codes for the battery and electronics coolant pumps; Ford traces them to the battery energy control module software and fixes them by reprogramming. GM, by contrast, folds short to power into P0C47. CARB requires the outputs of battery thermal management to be monitored for circuit faults. If the pump actually loses its command, the battery heats up faster under load and the system reduces power. P0C48 is the low counterpart, P0C4D concerns the supply voltage instead.

Likely causes

Battery control module software (Ford/Lincoln 2020 hybrids, TSB 20-2293/20-2345)
Control wire shorted to battery voltage
Control line interrupted at the pump connector

Symptoms

  • MIL on
  • Battery power reduced during long climbs or fast charging

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€50–700
Time0.5–2.5 h

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

Parts involved

hv battery pack coolant pump awiring harnessbms

Related codes

P0C47P0C48P0C4AP0C4DP0CFFP0E1C

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