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

P024E Charge Air Cooler Bypass Position Sensor A Circuit Low

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. Its position sensor is usually built into the actuator, with a 5 V reference and a ratiometric signal. P024E means the signal is below its lower limit – a signal wire shorted to ground or an open signal or 5 V reference wire. Bypass control is then switched off and the flap stays in its rest position. No manufacturer document using this code was found – GM and Ford do not use the bypass codes; the description rests on CARB's component monitoring requirement and a Bosch patent on the bypass valve.

Likely causes

Signal wire shorted to ground or open
5 V reference missing
Sensor faulty
Connector corroded

Symptoms

  • Check engine light on
  • Depending on the rest position: longer warm-up or higher charge air temperature with slight loss of power
  • Often nothing noticeable while driving

Repair estimate

DifficultyMediumDIY possible
Parts and labour€30–450
Time0.5–2 h

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

Parts involved

charge air cooler bypass position sensor acharge air cooler bypass actuator asensor wiring

Related codes

P024CP024DP024FP024A

References: law.cornell.edu, patents.google.com.