What causes fault code P022F?

• Most likely: Short to voltage in the bypass valve wiring harness • Likely: Faulty bypass solenoid/actuator (internal short) • Possible: Corroded or loose electrical connectors • Rare: Internal Engine Control Unit (ECU) failure

Powertrain (Engine & Gearbox)Standard EOBD

P022F - Charge Air Cooler Bypass Control Circuit High

Q: What are the symptoms of fault code P022F?

• Check engine light (MIL) illuminated • Reduced engine performance (potential Limp Mode) • Increased fuel consumption • Rough idling during cold starts • Increased exhaust emissions

Q: How do you fix fault code P022F?

STEP 1: Visually inspect the wiring and connector for the CAC bypass valve for chafing, heat damage, or corrosion. STEP 2: Use a multimeter to check for short to voltage on the control line. Monitor the signal with the ignition ON. STEP 3: Measure the internal resistance of the solenoid. Typically, it should be between 10-35 Ohms depending on the manufacturer. Infinite resistance indicates an open coil. STEP 4: Perform a bi-directional functional test using a scan tool to actuate the valve. Verify if the valve responds physically. STEP 5: If the wiring and actuator test fine, inspect the ECU driver circuit for faults.

Last updated:1 February 2026

Related:Intercooler, Bypass-ventil, Engine Control Unit (ECU), Temperaturgivare laddluft (IAT), Turbocharger

System

Powertrain (Engine & Gearbox)

Related Fault Codes

P0200

Injector Circuit Malfunction

P0201

Cylinder 1 Injector Circuit Open

P0202

Injector Circuit - Cylinder 2 - Malfunction

P0203

Injector Circuit - Cylinder 3

Technical Description

P022F is stored when the Engine Control Unit (ECU) detects an abnormally high voltage signal within the Charge Air Cooler (CAC) bypass control circuit. This bypass valve redirects intake air away from the intercooler during specific modes, such as cold starts or to prevent icing/condensation. A 'High' condition typically suggests a short to voltage or an open circuit where the control line is pulled high. This fault disrupts charge air temperature management, leading to suboptimal combustion and potential emission issues.

Possible Causes

Short to voltage in the bypass valve wiring harness

Faulty bypass solenoid/actuator (internal short)

Corroded or loose electrical connectors

Internal Engine Control Unit (ECU) failure

Symptoms

Check engine light (MIL) illuminated

Reduced engine performance (potential Limp Mode)

Increased fuel consumption

Rough idling during cold starts

Increased exhaust emissions

Do you also have
other fault codes?

See how P022F connects with your other fault codes. Our advanced analysis tool identifies causal relationships and root causes directly.

Analyze multiple codes

P022F - Charge Air Cooler Bypass Control Circuit High

Related Fault Codes

Technical Description

Possible Causes

Symptoms

Recommended Solution

Workflow

Mechanic's Tip

Do you also have
other fault codes?

P022F - Charge Air Cooler Bypass Control Circuit High

Related Fault Codes

Technical Description

Possible Causes

Symptoms

Recommended Solution

Workflow

Mechanic's Tip

Do you also have other fault codes?

Do you also have
other fault codes?