P023C
Charge Air Cooler Coolant Pump A Control Circuit High
Charge-air cooling
Generic OBD-II
Low
What it means
P023C means the ECM has detected a high-voltage (open or shorted-to-power) fault in the control circuit for the charge-air-cooler coolant pump — the electric pump that circulates coolant through a turbo or supercharged engine's intercooler. It's an electrical fault, not an engine-running problem, so the main effect is a warning light and possibly reduced boost under heavy load.
Low
Can I keep driving? Generally drivable — the fault is in an electrical control circuit, though sustained high-boost driving may be limited to protect the engine.
Common symptoms
What you'll notice
- Check-engine light on (often the only sign)
- Reduced power or boost under sustained hard driving
- Higher intake-air temperatures on data readouts
Common causes
Most likely first
- Open or short-to-voltage (high) in the charge-air-cooler coolant pump control-circuit wiringLikely
- Corroded or loose connector at the coolant pumpCommon
- Faulty charge-air-cooler coolant pumpCommon
- Failed ECM / pump driver (rare — verify wiring first)Less often
How to diagnose & fix
Work through it in order
- Scan and read freeze-frame data to confirm the circuit is reading high (open or shorted to power).
- Inspect the coolant pump connector and wiring for damage, corrosion, or a broken ground.
- Measure the pump's control-circuit voltage and the pump's resistance against spec.
- Confirm the pump actually runs when commanded; replace it if it's open or seized.
- Only after the wiring and pump check out, consider the ECM/driver. Clear and re-test.
FAQ
Quick answers
Is it safe to drive with P023C?+
For normal driving, usually yes. The low-temperature coolant pump for the intercooler may not run, so avoid sustained high-boost use until it's repaired.
Can I just clear P023C?+
It will return until the circuit fault is fixed. Clearing only confirms whether it comes back.
Related codes
Often seen with P023C
Read & clear P023C yourself
Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.
✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX