Fuel and air

P022F — Charge Air Cooler Bypass Control B Circuit High

Severity: medium Drive with care, to a shop

What P022F means

The engine control unit operates a bypass valve that routes intake air through the charge air cooler or around it. P022F is set when the voltage in control circuit B is higher than expected. The cause can be a faulty valve actuator or a wiring short or open.

Symptoms

  • Check Engine light on
  • Reduced engine power
  • Possible limp mode
  • Poor fuel economy
  • Lack of turbo or supercharger boost

Possible causes

  1. Faulty charge air cooler bypass valve or actuator
  2. Wiring harness fault: short to voltage, short to ground or open circuit
  3. Corroded or loose connector pins
  4. Internal ECM/PCM fault (rare)

How to diagnose

  1. Scan all codes and freeze frame data, clear the code and see if it returns
  2. Inspect the bypass valve, connector and harness for damage, oil, moisture and corrosion
  3. Check that the flap moves freely and the actuator responds to a scan tool command
  4. Compare the commanded and actual valve position in live data
  5. Test the control circuit for opens and shorts to power or ground using the wiring diagram
  6. Check supply voltage and ground quality at the valve connector
  7. If wiring and valve are good, check the ECM and look for software updates

Common fixes

  • Clean or replace corroded connector terminals
  • Repair the damaged section of wiring
  • Replace the charge air cooler bypass valve or actuator
  • Reprogram or repair the ECM as a last resort

Questions and answers

Can I drive with P022F?

Short trips are usually possible, but power may be reduced and the engine may go into limp mode. Do not put off diagnosis.

What most often causes P022F?

Most often a wiring or connector problem at the bypass valve, or a failed valve itself. ECM failure is uncommon.

This is general information about the code. The meaning can differ between makes and models: a scan tool and the repair manual for your car will show the exact cause.