Failed electric coolant pump for the charge air cooler; Damaged or corroded wiring harness or connector at the pump; Blown fuse or faulty relay supplying power to the pump circuit; Open or shorted supply voltage wire between the pump and the control module; Faulty powertrain control module or pump control module; Poor ground connection for the pump circuit; Coolant leak or air lock causing the pump to overheat and fail electrically

DTC codes / P2Bxx · Hybrid propulsion / P2BC2

P2BC2Charge Air Cooler Coolant Pump A Supply Voltage Circuit

Q: What does code P2BC2 mean?

Charge Air Cooler Coolant Pump A Supply Voltage Circuit. P2BC2 indicates that the powertrain control module has detected an abnormal voltage condition on the supply circuit for the electric coolant pump that serves the charge air cooler, which is the heat exchanger that cools compressed intake air before it enters the engine. The computer monitors the voltage on the pump's power feed and sets this code when the signal falls outside the expected range, typically indicating an open circuit, a short to ground, or a short to voltage.

P2BC2 indicates that the powertrain control module has detected an abnormal voltage condition on the supply circuit for the electric coolant pump that serves the charge air cooler, which is the heat exchanger that cools compressed intake air before it enters the engine. The computer monitors the voltage on the pump's power feed and sets this code when the signal falls outside the expected range, typically indicating an open circuit, a short to ground, or a short to voltage.

SystemPowertrain

Code typeGeneric (all makes)

SeverityMedium

Fix difficultyIntermediate

AreaHybrid propulsion

Symptoms you may notice

Illumination of the check engine light, often with no other noticeable symptoms
Reduced engine performance or power due to elevated intake air temperatures
The cooling fan may run excessively or continuously as the module tries to manage heat
In some vehicles, a message on the driver information display warning of reduced power or service required
Poor fuel economy or increased turbo lag during acceleration
Overheating of the charge air cooler system may lead to derating of engine output in extreme cases

Common causes, most likely first

Failed electric coolant pump for the charge air cooler
Damaged or corroded wiring harness or connector at the pump
Blown fuse or faulty relay supplying power to the pump circuit
Open or shorted supply voltage wire between the pump and the control module
Faulty powertrain control module or pump control module
Poor ground connection for the pump circuit
Coolant leak or air lock causing the pump to overheat and fail electrically

How to diagnose and fix it

Verify the code with a scan tool and check for any related codes in other modules
Inspect the coolant pump fuse and relay, and replace if blown or faulty
Visually inspect the wiring harness and connector at the coolant pump for damage, corrosion, or loose pins
Measure the supply voltage at the pump connector with the key on and engine off, comparing to battery voltage
Perform a voltage drop test on the ground circuit and the power feed to identify excessive resistance
Command the coolant pump on with a scan tool and listen for operation, or measure current draw if possible
If the circuit is intact and voltage is correct but the pump does not run, replace the coolant pump and clear the code

What the supply voltage code really tells you

A P2BC2 is often set by a simple blown fuse that also powers other components, so always check fuses before condemning the pump.
The code can be triggered by a momentary voltage spike or drop, so intermittent faults may not reappear during a quick test drive.
Some vehicles use a pulse-width-modulated signal to control the pump, and a standard multimeter may not show the true average voltage, requiring an oscilloscope for accurate diagnosis.
A failed charge air cooler pump can cause the engine to derate power without setting any other codes, so technicians should not overlook this system when diagnosing low power complaints.
Corrosion inside the pump connector is a common cause that is easily missed if only the pump itself is replaced without repairing the harness.

Can I keep driving with P2BC2?

You can usually drive the vehicle short distances to a repair shop, but avoid heavy acceleration or sustained high-load driving because the charge air cooler may not function properly, leading to reduced power and potential engine damage. If the engine enters limp mode or you notice overheating, stop driving and seek professional assistance.

Tools that help

Tools we recommend are in the Auto Veteran shop on Amazon. As an Amazon Associate we earn from qualifying purchases.

Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.