P2CB4: Charge Air Cooler Coolant Pump B Supply Voltage Circuit

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

Most likely causes

• Supply fuse blown
• Wiring or connector fault

What to check, in order

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

1. With the engine cold, check the coolant level; never do this when the system is hot
2. Check the actual temperature in live data
3. Make sure the fan comes on when it should
4. Check the thermostat and connector
5. Measure the sensor and replace it if its readings do not make sense

Good to know

• Repair difficulty: medium
• It can trigger limp mode.

What each character of P2CB4 means

• P: Powertrain: engine and transmission
• 2: Generic code: same on every make
• C: Subsystem depends on the code range
• B4: Specific fault in that system

Frequently asked questions

Can I keep driving with code P2CB4?

Watch the temperature gauge. If it climbs or a warning appears, stop the car in a safe place and turn off the engine: overheating can cause serious damage.

What causes code P2CB4?

The most common causes are: supply fuse blown; wiring or connector fault.

Related codes

• P2BC2Charge Air Cooler Coolant Pump A Supply Voltage Circuit

Sources

• github.com: dtc database
• en.wikipedia.org: Intercooler

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.