P2CAE: Charge Air Cooler Coolant Pump B Control Circuit Low

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

Medium severity. Can I keep driving?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.

Most likely causes

Control wire shorted to ground
Internal short in pump motor
Connector pins corroded - high contact resistance

What to check, in order

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

With the engine cold, check the coolant level; never do this when the system is hot
With the connector unplugged, check whether the signal wire is making contact with ground.
Check the actual temperature in live data
Make sure the fan comes on when it should
Check the thermostat and connector
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 P2CAE means

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

Frequently asked questions

Can I keep driving with code P2CAE?

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 P2CAE?

The most common causes are: control wire shorted to ground; internal short in pump motor; connector pins corroded - high contact resistance.

Related codes

P023BCharge Air Cooler Coolant Pump A Control Circuit Low

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.