P2CAF: Charge Air Cooler Coolant Pump B Control Circuit High

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

Most likely causes

• Control wire shorted to B+
• Open pump motor
• Connector pins corroded - high contact resistance

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 sensor's ground and make sure the signal wire is not receiving voltage from another circuit.
3. Check the actual temperature in live data
4. Make sure the fan comes on when it should
5. Check the thermostat and connector
6. 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 P2CAF means

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

Frequently asked questions

Can I keep driving with code P2CAF?

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 P2CAF?

The most common causes are: control wire shorted to B+; open pump motor; connector pins corroded - high contact resistance.

Related codes

• P023CCharge Air Cooler Coolant Pump A Control Circuit High

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.