P022F: Charge Air Cooler Bypass Control B Circuit High

What does P022F mean?

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. B is a second bypass actuator; whether any engine has one is not documented. P022F means the drive circuit reads high – typically the control wire shorted to voltage, so the driver cannot switch it. The module then switches bypass control 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.

The code tells you which monitor failed, not which part is broken. Test before replacing parts.

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

Common causes

• High Control wire shorted to voltage
• Medium Actuator shorted internally (overcurrent)
• Medium Moisture or corrosion in the connector
• Low Driver stage in the engine module faulty

Likelihood is a general estimate across vehicles; your make and model may differ.