Damaged, chafed or broken wiring between the control unit and the bypass actuator; Corroded, loose or pushed-out pins at the actuator connector or control unit connector; Failed charge air cooler bypass valve or solenoid with an open internal coil or motor winding; Blown fuse or faulty relay, or missing power or earth supply to the actuator; Heat or vibration damage to the harness near the turbocharger or intake pipework; Fault inside the engine control unit driver stage.

P022D

Charge Air Cooler Bypass Control B Circuit /Open.

Generic
Powertrain
Generic code
Medium severity

How this code is built

P: SystemPowertrain
0: Defined bySAE, the same on every car
2: AreaFuel and air metering (injector circuit)
2D: FaultThe specific fault in that area

What it means

P022D is the generic code for a fault in the Charge Air Cooler Bypass Control 'B' circuit, reported as an open circuit. The engine control unit monitors the driver circuit for the bypass actuator (valve or solenoid) and has seen a voltage or current that indicates a break in the circuit. Which actuator is 'B', and how the bypass is built, depends on the vehicle and engine.

Symptoms

Engine warning light on
Reduced power or the car going into limp mode
Poor or inconsistent boost response
Hesitation under load
Higher than usual intake air temperatures or fuel consumption
Possible additional charge air or boost related codes stored

Possible causes

Damaged, chafed or broken wiring between the control unit and the bypass actuatorlikely
Corroded, loose or pushed-out pins at the actuator connector or control unit connectorlikely
Failed charge air cooler bypass valve or solenoid with an open internal coil or motor windinglikely
Blown fuse or faulty relay, or missing power or earth supply to the actuatorpossible
Heat or vibration damage to the harness near the turbocharger or intake pipeworkpossible
Fault inside the engine control unit driver stagerare

How to diagnose

Read all stored and pending codes and the freeze frame data, noting engine load, temperature and boost at the time the fault set, and check for related codes such as the A circuit or boost faults.
Check the manufacturer's information for how the bypass B circuit is wired on this model and engine, including fuse and relay details.
Visually inspect the actuator, its connector and the harness for chafing, heat damage, corrosion, water ingress or loose pins.
Use a bidirectional scan function, if available, to command the bypass actuator and listen or feel for operation.
With the ignition off and the connector unplugged, measure the actuator resistance and compare it with the specification for that model.
Check the supply voltage and earth at the connector with the ignition on, then test the wiring for continuity and for shorts to earth or supply back to the control unit.
Check the relevant fuse and relay if fitted.
If the wiring and actuator are good, check the control unit connector pins and the driver signal before considering the control unit.

How to fix

Repair or replace damaged wiring and secure the harness away from heat and sharp edges.
Clean, repair or replace corroded or damaged connector terminals.
Replace the faulty bypass valve or actuator, following the correct procedure for the model.
Replace the blown fuse or faulty relay after finding out why it failed.
Repair or replace the engine control unit only after all other causes are ruled out, and have it programmed correctly where required.

Can I keep driving?

Medium severity

The car can usually be driven carefully for a short time, but it may have reduced power and the fault could affect charge air temperature control. Get it checked soon, and stop driving if power is badly reduced or other warnings appear.

Guide written by AI from the code's definition. Confirm with a diagnosis before replacing parts.