P022DCharge Air Cooler Bypass Control B Circuit/Open
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Needs a drive cycle to confirm a fix
- How the car detects it
- 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. P022D is the general circuit fault of the actuator drive, mainly an open circuit: the driver sees no current or an output voltage outside its window. 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.
- What you may notice
- 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
- Likely causes
- LikelyWire or connector at the bypass actuator open
- PossibleActuator or solenoid of the bypass flap faulty (coil, motor)
- RareFuse or relay of the actuator supply
- RareDriver stage in the engine module faulty
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Often possible to do yourself.Typical cost: €30 – €450
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.