P2CA2: Charge Air Cooler Coolant Pump Sense Circuit Low

What it means

The sense feedback circuit for the charge air cooler coolant pump reports a low condition. Pump output verification 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 circulates coolant to control compressed-air temperature, and its sense circuit lets the control module verify pump operation. P2CA2 sets when that feedback signal is below its expected range, commonly from a short to ground or an open sense wire.

Common causes

Most likely first.

1. Sense wire shorted to ground
2. Open in sense wire
3. Connector pins corroded - high contact resistance

Symptoms

• Check-engine light
• Reduced engine power or acceleration
• Charge-air temperature warning, if equipped

How to diagnose it

1. Record freeze-frame data and review live pump feedback and charge-air temperature to establish when the low signal occurred.
2. Inspect the pump connector and sense wire for damage, disconnected plugs, corrosion, or chafing against ground.
3. Check connector pins for corrosion or looseness that could interrupt the feedback circuit.
4. Using the vehicle wiring information, test the sense circuit for continuity and for a short to ground.
5. Compare the circuit readings and pump feedback with the manufacturer's specification before condemning the pump or control module.

Common fixes

• Reconnect the pump plug or clean and secure its corroded pins.
• Repair an open or damaged section of the sense wire.
• Repair a sense wire shorted to ground.
• Replace the pump only if testing confirms its feedback output is faulty.

Can I keep driving?

Avoid heavy loads and sustained boost because the module may not be able to verify charge-air cooling, and power may be reduced. Stop if a charge-air temperature warning appears or the engine loses substantial power.