Powertrain, generic · Fuel and air metering (injector circuit)

P024A Charge Air Cooler Bypass Control A Range/Performance

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modeNo

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.

Likely causes

Bypass flap sticking, coked or oily (oil from crankcase ventilation or turbo)
Actuator weak or vacuum line leaking
Engine software (FCA 2.0 turbo)
Position sensor inaccurate or connector corroded

Symptoms

  • Check engine light on
  • Longer warm-up or higher charge air temperature
  • Possibly less power from boost limitation

Repair estimate

DifficultyMediumDIY possible
Parts and labour€0–500
Time0.3–2.5 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

charge air cooler bypass actuator aactuator wiringengine control modulecharge air cooler

Related codes

P024BP024DP022AP026AP0299

References: law.cornell.edu, patents.google.com, static.nhtsa.gov, static.nhtsa.gov.