P022F

What it means

P022F is a generic powertrain code meaning the engine control unit has detected a high voltage condition in the control circuit for charge air cooler bypass control 'B'. The control unit drives the bypass actuator (a valve or flap that routes intake air around the intercooler) and monitors the circuit. It set the code because the voltage was higher than expected, which usually points to a short to voltage, an open circuit in some designs, or a fault in the actuator or driver.

Symptoms

• Engine warning light on
• Reduced power or the engine going into limp mode
• Poor or inconsistent boost response
• Higher than normal intake air temperatures or a hot-running intercooler
• Possible pinging or hesitation under load
• Other charge air or boost-related codes stored alongside

Possible causes

• Faulty charge air cooler bypass actuator or valve (internal short or failed solenoid or motor)likely
• Wiring fault in the control circuit, such as a short to supply voltage or chafed insulationlikely
• Corroded, loose or damaged connector terminals at the actuator or control unitlikely
• Open circuit or high resistance in the ground or return side of the circuit, causing a high voltage readingpossible
• Blown fuse or fault in the power supply feed to the actuatorpossible
• Fault inside the engine control unit driver circuitrare
• Outdated control unit software that is a known cause on certain models (depends on make and engine)rare

How to diagnose

1. Read all stored and pending codes and note the freeze frame data, including engine load, intake air temperature and coolant temperature when it set.
2. Check for related codes (other bypass circuit codes, boost, intake air temperature) and look up any manufacturer service bulletins for the specific model and engine.
3. Visually inspect the bypass actuator, its wiring and connector for heat damage, chafing, corrosion, moisture or pushed-back pins.
4. Check the relevant fuses and the power supply to the actuator against the wiring diagram for your vehicle.
5. With the ignition off, test the actuator's resistance and check its mechanical movement for sticking or seizure, using the figures for the specific model.
6. Command the actuator with a diagnostic scan tool if supported and watch the response and the circuit voltage.
7. Test the control circuit wiring for short to voltage, open circuit and high resistance on both the signal and ground sides.
8. If wiring and actuator test fine, check the control unit's power and ground supplies before suspecting the control unit itself.

How to fix

• Replace the charge air cooler bypass actuator or valve if it has failed electrically or mechanically.
• Repair or replace damaged wiring and fix any short to voltage or open circuit found.
• Clean or replace corroded or damaged connector terminals and secure the connector properly.
• Replace a blown fuse only after finding and fixing the cause of the overload.
• Update the control unit software only if a published bulletin identifies an outdated calibration as the cause for that vehicle.
• Repair or replace the engine control unit as a last resort once all other causes are ruled out.

Can I keep driving?

Nearby codes

• P022EGenericCharge Air Cooler Bypass Control B Circuit Low
• P0230GenericFuel Pump Primary Circuit