Fuel and air

P022E — Charge Air Cooler Bypass Control "B" Circuit Low

Severity: medium Drive with care, to a shop

What P022E means

The engine control module operates a bypass valve that routes intake air through or around the charge air cooler to manage intake air temperature. P022E sets when the voltage in control circuit "B" stays below the expected range. Typical causes are a wiring open or short to ground, a failed valve actuator, or a power supply problem.

Symptoms

  • Check Engine light on
  • Reduced power and sluggish acceleration
  • Lower than normal boost
  • Worse fuel economy
  • Possible limp mode

Possible causes

  1. Damaged wiring or a short to ground in the valve circuit
  2. Corroded or loose connector
  3. Faulty or stuck bypass valve actuator
  4. Blown fuse or bad relay in the circuit
  5. Internal ECM driver fault (rare)

How to diagnose

  1. Read all codes and freeze frame data, clear the code and see if it returns
  2. Inspect the valve wiring and connector for chafing, heat damage, moisture and corrosion
  3. Check the fuse and relay for the circuit
  4. Check power and ground at the actuator connector with a multimeter, following the wiring diagram
  5. Test the control wire for opens and shorts to ground
  6. Command the valve with a scan tool and confirm it moves freely
  7. Measure actuator resistance and compare it to specification
  8. If everything tests good, evaluate the ECM and check for software updates

Common fixes

  • Repair wiring or replace a damaged connector
  • Replace the fuse or relay
  • Replace the bypass valve or actuator
  • Repair, reflash or replace the ECM once other causes are ruled out

Questions and answers

Can I drive with code P022E?

Briefly and carefully, yes, but power may be limited. Get it diagnosed soon to avoid hot intake air and wasted fuel.

What most often causes P022E?

Wiring or connector problems at the bypass valve, such as an open or a short to ground, are the most common. A failed actuator or a blown fuse or bad relay come next.

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.