Faulty charge air cooler coolant pump, such as a worn brush or internal electrical failure.; Damaged or corroded wiring harness or connector at the pump or PCM.; Open or short circuit in the pump sense circuit, including chafed wires or loose pins.; Failed pump control module or relay, if equipped separately.; PCM internal fault, though rare, misinterpreting the sense signal.; Low coolant level or air lock causing the pump to operate erratically and set a performance code.; Electrical interference or poor ground connection affecting the sense circuit.

DTC codes / P2Cxx · Hybrid propulsion / P2CA3

P2CA3Charge Air Cooler Coolant Pump Sense Circuit Performance

Q: What does code P2CA3 mean?

Charge Air Cooler Coolant Pump Sense Circuit Performance. P2CA3 indicates that the powertrain control module (PCM) has detected an abnormal performance in the electrical sense circuit for the charge air cooler (CAC) coolant pump. The PCM monitors the pump's feedback signal and sets this code when the signal does not match expected values for the given operating conditions, indicating a fault in the circuit or pump itself.

P2CA3 indicates that the powertrain control module (PCM) has detected an abnormal performance in the electrical sense circuit for the charge air cooler (CAC) coolant pump. The PCM monitors the pump's feedback signal and sets this code when the signal does not match expected values for the given operating conditions, indicating a fault in the circuit or pump itself.

SystemPowertrain

Code typeGeneric (all makes)

SeverityMedium

Fix difficultyIntermediate

AreaHybrid propulsion

Symptoms you may notice

Illumination of the check engine light (malfunction indicator lamp).
Often no symptoms besides the warning light, especially if the pump still operates intermittently.
Reduced engine performance or power due to elevated intake air temperatures.
Possible overheating of the charge air cooler system, leading to derating or limp mode.
In rare cases, the coolant pump may be heard running continuously or not at all.
No noticeable drivability issues in many instances, as the fault may be electrical only.

Common causes, most likely first

Faulty charge air cooler coolant pump, such as a worn brush or internal electrical failure.
Damaged or corroded wiring harness or connector at the pump or PCM.
Open or short circuit in the pump sense circuit, including chafed wires or loose pins.
Failed pump control module or relay, if equipped separately.
PCM internal fault, though rare, misinterpreting the sense signal.
Low coolant level or air lock causing the pump to operate erratically and set a performance code.
Electrical interference or poor ground connection affecting the sense circuit.

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 level and bleed the system if necessary to ensure proper pump operation.
Visually inspect the pump connector and wiring for damage, corrosion, or loose pins.
Perform a resistance and voltage drop test on the sense circuit between the pump and PCM.
Command the pump on with a scan tool and listen for operation; compare actual current draw to specifications.
If the circuit tests good, substitute a known-good pump or perform a bench test to confirm pump failure.
Repair or replace faulty wiring, connectors, or the pump as needed, then clear codes and verify the repair.

Diagnosing the CAC pump sense circuit

A common oversight is assuming the pump is bad when the real issue is a corroded connector or chafed wire in the sense circuit, so always perform a thorough visual and electrical test before replacing parts.
The code can set even if the pump still runs, because the PCM is monitoring the sense signal's performance, not just pump operation, so a pump that spins does not guarantee a good circuit.
Low coolant or trapped air can cause the pump to cavitate and produce an erratic sense signal, mimicking an electrical fault, so bleeding the system is a critical first step.
On some vehicles, the charge air cooler pump shares a circuit with other components, and a fault elsewhere can set this code, so check for additional codes that might point to a shared power or ground issue.
Replacing the pump without clearing adaptations or performing a relearn procedure may result in the code returning, as some PCMs require a pump calibration after service.

Can I keep driving with P2CA3?

You can generally continue driving with this code, but avoid sustained heavy loads or aggressive driving that could raise intake air temperatures and trigger reduced power. If the engine enters limp mode or you notice overheating, stop and have the system inspected promptly.

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.