Wiring fault in the bypass actuator control circuit, such as chafing causing a short to ground; Faulty charge air cooler bypass actuator or solenoid with an internal short; Corroded, damaged or loose connector at the actuator or control unit; Water or oil contamination in the actuator or its connector; Blown fuse or fault in the supply to the actuator, where fitted on the circuit; Fault within the engine control unit driver circuit; Outdated control unit software where the manufacturer has issued a revision for this fault.

P022E

Charge Air Cooler Bypass Control B Circuit Low.

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)
2E: FaultThe specific fault in that area

What it means

P022E is a generic powertrain code meaning the engine control unit has detected a low voltage condition in the control circuit for charge air cooler bypass 'B'. The control unit monitors the circuit that drives the bypass actuator (a valve or flap that routes intake air around or through the charge air cooler). If the voltage is lower than expected for the commanded state, such as a short to ground, the code sets. The exact layout, and which actuator is 'B', depends on the model and engine.

Symptoms

Engine warning light on
Reduced power or the engine going into a limp mode on some models
Higher or lower than normal intake air temperatures
Poor throttle response or hesitation under boost
Possible increase in fuel consumption
Occasional pinking or knock on some engines if intake air is too hot

Possible causes

Wiring fault in the bypass actuator control circuit, such as chafing causing a short to groundlikely
Faulty charge air cooler bypass actuator or solenoid with an internal shortlikely
Corroded, damaged or loose connector at the actuator or control unitpossible
Water or oil contamination in the actuator or its connectorpossible
Blown fuse or fault in the supply to the actuator, where fitted on the circuitpossible
Fault within the engine control unit driver circuitrare
Outdated control unit software where the manufacturer has issued a revision for this faultrare

How to diagnose

Read all stored and pending codes and note the freeze frame data, including engine load, intake air temperature and coolant temperature
Check for related codes for other charge air cooler bypass circuits, boost pressure or intake air temperature sensors, as these can point to a shared cause
Visually inspect the actuator, its wiring and connectors for chafing, heat damage, corrosion, water ingress or loose pins
Check the relevant fuses and supply voltage to the actuator using the manufacturer's wiring diagram
Use a scan tool's bi-directional controls, if supported, to command the actuator and listen or feel for movement
Measure the actuator coil or motor resistance and compare with the manufacturer's specification, which varies by model
With the connector disconnected, test the control wire for a short to ground and for continuity back to the control unit
Check for any applicable manufacturer service bulletins or software updates for your model and engine

How to fix

Repair or replace damaged wiring, and secure it clear of sharp edges and heat sources
Clean or replace corroded or damaged connectors and terminals
Replace the charge air cooler bypass actuator if it fails electrical or movement tests
Fix the cause of water or oil contamination before fitting a new actuator
Replace a blown fuse only after finding and correcting the cause of the overload
Update the control unit software only if a relevant revision exists for this fault, or repair the control unit if testing proves it faulty

Can I keep driving?

Medium severity

The car can usually be driven carefully for a short time, but the engine may have reduced power and the fault should be fixed soon. Avoid heavy loads and high boost until it has been checked, and stop if the engine runs roughly, knocks or shows other warnings.

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