P022A

What it means

P022A is the generic code for an open circuit in the charge air cooler bypass control 'A' circuit. The engine control unit commands the bypass actuator (valve or flap that routes intake air around or through the charge air cooler) and monitors the circuit. It has detected an open circuit, meaning no continuity between the control unit and the actuator or its supply.

Symptoms

• Engine warning light on
• Loss of power or reduced boost under load
• Higher than normal intake air temperatures
• Hesitation or poor throttle response
• Possible limp mode on some models
• Slightly higher fuel consumption

Possible causes

• Damaged, chafed or broken wiring in the bypass actuator circuitlikely
• Corroded, loose or pushed-out pins at the actuator connectorlikely
• Faulty charge air cooler bypass actuator or solenoid with an open internal coil or motor windinglikely
• Blown fuse or open circuit in the actuator power or earth supplypossible
• Poor connection at the engine control unit connectorpossible
• Internal driver fault in the engine control unitrare

How to diagnose

1. Read all stored codes and freeze frame data to see engine load, temperature and conditions when the fault set, and note any related boost or intake temperature codes.
2. Check for technical service bulletins and identify the bypass actuator location and type for this model and engine, as layout varies.
3. Visually inspect the actuator, its wiring and connector for heat damage, chafing, corrosion, oil contamination or loose pins.
4. Check the relevant fuse and the actuator power supply and earth with the ignition on, following the manufacturer wiring diagram.
5. Use a bidirectional scan function, where supported, to command the actuator and confirm it moves or clicks.
6. With the connector unplugged, test the actuator resistance or continuity against the specification for that model.
7. Test wiring continuity between the actuator connector and the control unit, and check for shorts to earth or supply.
8. Clear the code, road test and recheck that it does not return.

How to fix

• Repair or replace damaged wiring, following proper wiring repair practice.
• Clean or replace corroded connectors and re-seat or repair loose terminals.
• Replace the charge air cooler bypass actuator if it fails electrical or movement tests.
• Replace the blown fuse after finding and fixing the cause of the overload.
• Repair or replace the engine control unit only after all wiring and actuator faults have been ruled out.

Can I keep driving?

Nearby codes

• P0229GenericThrottle/Pedal Position Sensor/Switch C Circuit Intermittent
• P022BGenericCharge Air Cooler Bypass Control A Circuit Low