Charge Air Cooler Coolant Pump Control Circuit Open
The P023A code indicates that the Engine Control Module (ECM) has detected an open circuit in the control circuit of the charge air cooler coolant pump. This pump circulates coolant through the charge air cooler to reduce intake air temperature, improving engine performance and efficiency. An open circuit means there is a break in the electrical path, preventing the pump from operating. This can lead to reduced engine power, increased emissions, and potential overheating of the intake air.
01. Most Common Causes
- Faulty charge air cooler coolant pump
- Open or shorted wiring in the pump control circuit
- Blown fuse or relay for the pump
- Corroded or loose electrical connectors
- Failed ECM (rare)
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Reduced engine power or performance
- Increased intake air temperatures
- Possible overheating under load
- Poor fuel economy
03. Step-by-Step Diagnosis
Step 1: Use a scan tool to verify the code and check for related codes.
Step 2: Inspect the coolant pump fuse and relay; replace if blown.
Step 3: Visually inspect the pump wiring and connectors for damage, corrosion, or looseness.
Step 4: Test the pump's electrical connector for voltage and ground with a multimeter.
Step 5: If voltage and ground are present, test the pump resistance; replace if out of spec.
Step 6: If no voltage, trace the circuit for opens or shorts; repair as needed.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive long distances, as reduced cooling of intake air can lead to engine damage under heavy load. Short trips may be okay, but have it diagnosed promptly.
How much does it cost to fix?▼
The cost typically ranges from $50 to $150 for parts and labor, depending on the cause. A pump replacement may cost more if the part is expensive.