P023CCharge Air Cooler Coolant Pump A Control Circuit High
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- Some engines cool the charge air with a coolant-to-air cooler in its own low-temperature circuit, driven by an electric pump – GM uses this on supercharged V8s such as the LT4 (Camaro ZL1, Corvette Z06, CTS-V) and LT5 (Corvette ZR1). P023C means GM's driver diagnosis has found a short to voltage (0.5 Ω or less between output and battery voltage with the driver on). Bundled conditions: main relay at least 11 V, ignition above 5 V; 50 of 63 samples set the code with the warning light in the first trip on 2018–2019 engines, older modules need two trips. Without the pump the charge air gets hot and boost is limited.
- What you may notice
- Check engine light on
- Loss of power under load or in heat (boost limited)
- Follow-up code P026A possible
- Likely causes
- LikelyControl wire to the pump shorted to voltage
- PossiblePump shorted internally (overcurrent)
- PossibleMoisture or corrosion in the connector
- RareDriver stage in the engine module faulty
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Often possible to do yourself.Typical cost: €30 – €450
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.