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.
Medium severity. Can I keep driving?Drive without demanding power and go to a repair shop soon. If you see a lot of blue smoke or hear a metallic noise, shut off the engine.
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
Most likely causes
- Signal wire shorted to ground or open
- 5 V reference missing
- Sensor faulty
- Connector corroded
What to check, in order
Start with the simplest. You can tick off each step.
Good to know
- Repair difficulty: medium
- It affects emissions.
What each character of P024E means
- P: Powertrain: engine and transmission
- 0: Generic code: same on every make
- 2: Fuel injection
- 4E: Specific fault in that system
Frequently asked questions
Can I keep driving with code P024E?
Drive without demanding power and go to a repair shop soon. If you see a lot of blue smoke or hear a metallic noise, shut off the engine.
What causes code P024E?
The most common causes are: signal wire shorted to ground or open; 5 V reference missing; sensor faulty.
Related codes
- P024CCharge Air Cooler Bypass Position Sensor A Circuit
- P024DCharge Air Cooler Bypass Position Sensor A Circuit Range/Performance
- P024FCharge Air Cooler Bypass Position Sensor A Circuit High
- P024ACharge Air Cooler Bypass Control A Range/Performance
Sources
Values and procedures vary by manufacturer. If it affects brakes, steering, fuel or high voltage, see a professional. Updated: 2026-11-04. How we build these pages.