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 (CAC) coolant pump. This pump circulates coolant through the CAC 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.
1. 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)
2. Symptoms You Will Notice
- Check Engine Light illuminated
- Reduced engine power or performance
- Poor fuel economy
- Engine overheating under load
- Increased intake air temperatures
3. Step-by-Step Diagnosis
Step 1: Use a scan tool to confirm the P023A code and check for related codes.
Step 2: Visually inspect the CAC coolant pump, wiring, and connectors for damage, corrosion, or loose connections.
Step 3: Test the pump's electrical circuit using a multimeter to check for continuity, voltage, and ground.
Step 4: Check the fuse and relay for the pump; replace if blown.
Step 5: If all else is okay, test the pump directly by applying power and ground; replace if it doesn't run.
4. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive long distances as reduced engine performance and potential overheating can cause further damage. Short trips to a repair shop are okay if the engine temperature stays normal.
How much does it cost to fix?▼
The cost typically ranges from $50 to $150 for parts and labor, depending on whether it's a simple wiring repair or pump replacement.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.