Charge Air Cooler Bypass Control Circuit High
The P022C code indicates that the Powertrain Control Module (PCM) has detected a high voltage signal from the charge air cooler (CAC) bypass control circuit. This circuit controls a bypass valve that regulates airflow through the CAC to optimize intake air temperature. A high voltage condition typically points to a short to power, open circuit, or a faulty actuator. This can lead to reduced engine performance, increased emissions, and potential overheating of the intake air.
01. Most Common Causes
- Faulty charge air cooler bypass actuator
- Short to power in the bypass control circuit
- Open circuit or high resistance in the wiring or connector
- Corroded or damaged electrical connector
- Failed PCM (rare)
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Reduced engine power or sluggish acceleration
- Poor fuel economy
- Possible engine overheating or excessive intake air temperatures
03. Step-by-Step Diagnosis
Step 1: Scan for additional codes and freeze frame data to confirm P022C.
Step 2: Visually inspect the CAC bypass actuator and wiring for damage, corrosion, or loose connections.
Step 3: Using a multimeter, check the bypass control circuit for voltage and continuity. Compare to manufacturer specifications.
Step 4: Test the bypass actuator by applying battery voltage and ground to see if it operates correctly.
Step 5: If all else is normal, consider a PCM software update or replacement.
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 overheating. Short trips to a repair shop are acceptable.
How much does it cost to fix?▼
The cost typically ranges from $50 to $150 for diagnosis and repair, depending on the root cause and labor rates.