Charge Air Cooler Bypass Control Circuit Low
The P022E code indicates that the Powertrain Control Module (PCM) has detected a low voltage condition in the charge air cooler (CAC) bypass control circuit. This circuit controls a valve that bypasses the CAC to quickly warm the intake air during cold starts, improving emissions and drivability. A low voltage signal suggests a short to ground, open circuit, or faulty actuator, which can prevent proper bypass operation, potentially affecting engine performance and emissions.
1. Most Common Causes
- Faulty charge air cooler bypass valve actuator
- Short to ground in the bypass control circuit wiring
- Open circuit or poor connection in the bypass control circuit
- Failed PCM (rare)
2. Symptoms You Will Notice
- Check Engine Light illuminated
- Reduced engine performance or hesitation
- Poor fuel economy
- Rough idle or stalling
3. Step-by-Step Diagnosis
Step 1: Use a scan tool to retrieve all codes and freeze frame data.
Step 2: Visually inspect the bypass valve and wiring for damage, corrosion, or loose connections.
Step 3: Test the bypass valve actuator resistance and compare to manufacturer specs.
Step 4: Check for voltage and ground at the actuator connector using a multimeter.
Step 5: If wiring and actuator are good, test PCM output signals; replace PCM if necessary.
4. Frequently Asked Questions
Is it safe to drive with this code?▼
It is generally safe for short distances, but reduced performance and fuel economy may occur. Prolonged driving could cause further issues, so it's best to diagnose and repair promptly.
How much does it cost to fix?▼
The cost typically ranges from $50 to $150 for parts and labor, depending on whether the actuator or wiring needs replacement.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.