P022C: Charge Air Cooler Bypass Control A Circuit High

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. P022C means the drive circuit reads high – typically the control wire shorted to voltage, so the driver cannot switch it. 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.

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

Most likely causes

• Control wire shorted to voltage
• Actuator shorted internally (overcurrent)
• Moisture or corrosion in the connector
• Driver stage in the engine module faulty

What to check, in order

Start with the simplest. You can tick off each step.

1. Check the hoses, clamps, and intercooler
2. Check the sensor's ground and make sure the signal wire is not receiving voltage from another circuit.
3. Compare commanded and actual pressure in live data
4. Check the actuator's movement
5. Check the vacuum hoses and the solenoid valve
6. Check the oil and the turbo shaft play before replacing it

Good to know

• Repair difficulty: medium
• It affects emissions.

What each character of P022C means

• P: Powertrain: engine and transmission
• 0: Generic code: same on every make
• 2: Fuel injection
• 2C: Specific fault in that system

Frequently asked questions

Can I keep driving with code P022C?

Drive without demanding power and go to a repair shop soon. If you see a lot of blue smoke or hear a metallic noise, shut off the engine.

What causes code P022C?

The most common causes are: control wire shorted to voltage; actuator shorted internally (overcurrent); moisture or corrosion in the connector.

Related codes

• P022ACharge Air Cooler Bypass Control A Circuit/Open
• P022BCharge Air Cooler Bypass Control A Circuit Low
• P024ACharge Air Cooler Bypass Control A Range/Performance
• P024BCharge Air Cooler Bypass Control A Stuck

Sources

• law.cornell.edu: 13 CCR 1968.2
• patents.google.com: US8417484

Values and procedures vary by manufacturer. If it affects brakes, steering, fuel or high voltage, see a professional. Updated: 2026-11-04. How we build these pages.