P024ACharge Air Cooler Bypass Control A Range/Performance
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Needs a drive cycle to confirm a fix
- How the car detects it
- The charge air cooler bypass is a flap or valve that routes compressed air around the charge air cooler, so the engine and exhaust warm up faster after a cold start; when warm it closes or opens partly to control intake air temperature. It is driven by an electric motor with a built-in position sensor or by a solenoid and vacuum can. P024A is the functional fault: the bypass does not follow its command, judged from the position sensor or from the expected temperature effect – Bosch describes comparing the cooler's efficiency with the valve closed and open, using modelled air temperature before and measured temperature after the cooler. FCA documents P024A, together with P026E, on the 2017 Alfa Romeo Giulia and 2018 Stelvio with the 2.0 turbo and fixed it with an engine software update, so check the software level first.
- What you may notice
- Check engine light on
- Longer warm-up or higher charge air temperature
- Possibly less power from boost limitation
- Likely causes
- LikelyBypass flap sticking, coked or oily (oil from crankcase ventilation or turbo)
- PossibleActuator weak or vacuum line leaking
- PossibleEngine software (FCA 2.0 turbo)
- RarePosition sensor inaccurate or connector corroded
- 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: €0 – €500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.