Powertrain, generic · Hybrid propulsion

P0C47 Hybrid/EV Battery Pack Coolant Pump A Control Circuit/Open

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P0C47 means the controller sees an electrical fault on the line that commands battery coolant pump A. GM's 2019 tables catch open, short to ground and short to power by current: with the pump on, less than 200 mA or more than 3 A on the control line count as failures, with the pump off less than 120 µA; 4 s within 5 s set a Type B code. Porsche reports P0C4700 on the 2015–2017 Cayenne plug-in hybrid (92A), often with the MIL as the only symptom, and blames corroded ground pin 6B, a corroded pump connector or poor wiring. Audi links it on the 2024 Q4 e-tron to corrosion at splice J1 with reduced power. Bentley warns that on 2025–2026 Continental GT and Flying Spur hybrids it can keep the car from switching to ready mode. P0C48 and P0C49 are the low and high variants.

Likely causes

Corroded or painted ground point or corroded pump connector (Porsche Cayenne 92A)
Corroded splice or chafed harness in the pump circuit (Audi Q4 e-tron, Bentley)
Failed electric coolant pump or its relay

Symptoms

  • MIL, frequently the only sign
  • Electrical or drive system warning with reduced power
  • Vehicle refuses to become ready to drive

Repair estimate

DifficultyHardWorkshop job
Parts and labour€80–900
Time0.5–3 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

P0C48P0C49P0C4AP0C4BP0E1FP0E1A

References: gsi.ext.gm.com, static.nhtsa.gov, static.nhtsa.gov, static.nhtsa.gov.