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

P022B Charge Air Cooler Bypass Control A Circuit Low

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. P022B 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.

Likely causes

Control wire shorted to ground (chafing)
Actuator winding shorted
Moisture or corrosion in the connector
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 aactuator wiringengine control module

Related codes

P022AP022CP024AP024B

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