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

P022D Charge Air Cooler Bypass Control B Circuit/Open

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. 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.

Likely causes

Wire or connector at the bypass actuator open
Actuator or solenoid of the bypass flap faulty (coil, motor)
Fuse or relay of the actuator supply
Driver stage in the engine module faulty

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
Time0.5–2.5 h

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

Parts involved

charge air cooler bypass actuator bactuator wiringengine control module

Related codes

P022EP022FP022A

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