Charge Air Cooler Coolant Pump Control Circuit High
The P023C code indicates that the Powertrain Control Module (PCM) has detected a high voltage condition 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. A high voltage signal may be caused by a short to power, a faulty pump, or a wiring issue. This can lead to reduced engine performance and increased emissions.
01. Most Common Causes
- Faulty charge air cooler coolant pump
- Short to power in the pump control circuit
- Open or shorted wiring or connectors
- Failed PCM (rare)
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Reduced engine power or performance
- Increased intake air temperatures
- Possible overheating in hot conditions
03. Step-by-Step Diagnosis
Step 1: Scan for additional codes and freeze frame data.
Step 2: Visually inspect the pump, wiring, and connectors for damage or corrosion.
Step 3: Test the pump control circuit voltage with a multimeter; compare to manufacturer specs.
Step 4: Check pump resistance and operation; replace if faulty.
Step 5: Clear code and test drive to verify repair.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is generally not recommended to drive long distances as reduced cooling can lead to engine damage, especially under load or in hot weather.
How much does it cost to fix?▼
The cost typically ranges from $50 to $150 for parts and labor, depending on the pump and labor rates.