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

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.

High severity. Can I keep driving?If the car still runs, drive as little as possible and go to a specialized repair shop. Do not touch the orange cables: they carry high voltage.

Symptoms

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

Most 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

What to check, in order

Start with the simplest. You can tick off each step.

Read the codes with a hybrid-compatible scanner and write down the freeze frame data
Check the continuity of the wire between the component and the control module.
Make sure the battery cooling air intake is clean
Check the 12 V auxiliary battery, which can also trigger warnings
Leave any high-voltage measurements to a specialized repair shop

Good to know

Repair difficulty: hard
It can trigger limp mode.
It affects emissions.

What each character of P0C47 means

P: Powertrain: engine and transmission
0: Generic code: same on every make
C: Subsystem depends on the code range
47: Specific fault in that system

Frequently asked questions

Can I keep driving with code P0C47?

If the car still runs, drive as little as possible and go to a specialized repair shop. Do not touch the orange cables: they carry high voltage.

What causes code P0C47?

The most common causes are: 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.

Related codes

Sources

Values and procedures vary by manufacturer. If it affects brakes, steering, fuel or high voltage, see a professional. Updated: 2026-11-04. How we build these pages.