P022E: Charge Air Cooler Bypass Control B Circuit Low

What does P022E 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. P022E means the drive circuit reads low – typically the control wire shorted to ground. 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 ground (chafing)
• Medium Actuator winding shorted
• 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.