P2BC2: Charge Air Cooler Coolant Pump A Supply Voltage Circuit

What it means

Charge air cooler coolant pump A reports a supply voltage circuit condition. Charge air cooling loop circulation is impaired.

At a glance

• Usually lights the check-engine light
• The engine or gearbox may go into limp mode

How it works

The charge air cooler coolant pump A circulates coolant through the loop that removes heat from the turbocharger’s compressed intake air. The engine control module monitors the pump’s supply-voltage circuit and sets P2BC2 when that circuit’s electrical condition is outside the expected range, which can stop or limit circulation.

Common causes

Most likely first.

1. Supply fuse blown
2. Wiring or connector fault

Symptoms

• Check-engine light
• Reduced engine power
• Higher intake-air temperature or reduced performance under load

How to diagnose it

1. Record freeze-frame data and check live pump-command and supply-voltage readings to see whether the fault occurs when pump A is requested.
2. With the system off, inspect pump A’s fuse, wiring, and connector for a blown fuse, damage, moisture, corrosion, or loose pins.
3. Check the fuse and supply path for power and continuity using the manufacturer’s procedure, and look for a short or open in the wiring.
4. If supply reaches the pump connector, compare the pump’s response and current draw with the manufacturer’s specification to distinguish a pump fault from a supply-circuit fault.
5. After repairs, clear the code and confirm pump operation and intake-air temperature under conditions similar to the freeze frame.

Common fixes

• Replace a blown pump A supply fuse after checking for the cause.
• Repair damaged or corroded supply wiring and secure the connector.
• Replace charge air cooler coolant pump A if its electrical response is outside specification.

Can I keep driving?

If power is reduced or intake-air temperatures rise, avoid hard acceleration, towing, and sustained high-load driving because charge-air cooling may be impaired. Stop if the engine overheats or the vehicle enters a severe power-limited state.