Charge Air Cooler Bypass Control Circuit High
The P022F code indicates that the Engine Control Module (ECM) has detected a high voltage condition in the charge air cooler (CAC) bypass control circuit. This circuit typically controls a solenoid or actuator that regulates airflow through the CAC bypass valve. A high voltage reading suggests a short to power, open circuit, or faulty component, which can lead to improper boost pressure management and reduced engine performance.
01. Most Common Causes
- Short to power in the CAC bypass control circuit wiring
- Faulty CAC bypass solenoid/actuator
- Corroded or damaged connector at the solenoid
- ECM internal failure (rare)
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Reduced engine power or hesitation during acceleration
- Poor fuel economy
- Possible turbocharger overboost or underboost
03. Step-by-Step Diagnosis
Step 1: Scan for additional codes and freeze frame data to confirm P022F.
Step 2: Visually inspect the CAC bypass solenoid connector and wiring for damage, corrosion, or shorts.
Step 3: Using a multimeter, check the voltage at the solenoid control circuit (should be 0V when commanded off, battery voltage when on).
Step 4: Test the solenoid resistance and compare to manufacturer specs; replace if out of range.
Step 5: If wiring and solenoid are good, suspect ECM issue and perform further diagnostics.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive long distances as it can cause reduced engine performance and potential damage to the turbocharger or engine due to improper boost control.
How much does it cost to fix?▼
The cost typically ranges from $50 to $150 for parts and labor, depending on whether the solenoid or wiring needs replacement.