EGR Cooler Bypass Control Circuit High
The P245D code indicates that the Powertrain Control Module (PCM) has detected a high voltage condition in the exhaust gas recirculation (EGR) cooler bypass control circuit. This circuit controls a valve that bypasses the EGR cooler to allow hot exhaust gases to flow directly into the intake, aiding in cold start emissions and preventing cooler fouling. A high voltage reading typically points to a short to power, open circuit, or a faulty actuator or sensor.
1. Most Common Causes
- Faulty EGR cooler bypass valve actuator
- Short to power in the control circuit wiring
- Open circuit or high resistance in the wiring or connector
- Failed PCM (rare)
2. Symptoms You Will Notice
- Check Engine Light illuminated
- Possible rough idle or hesitation
- Increased emissions
- Reduced fuel economy
3. Step-by-Step Diagnosis
Step 1: Use a scan tool to confirm the code and check for related codes.
Step 2: Visually inspect the EGR cooler bypass valve and its wiring for damage, corrosion, or loose connections.
Step 3: Test the actuator circuit with a multimeter for shorts to power or ground, and check resistance.
Step 4: If wiring is OK, test the actuator by applying battery voltage and ground to see if it operates.
Step 5: Replace the actuator if faulty; if not, suspect a PCM issue.
4. Frequently Asked Questions
Is it safe to drive with this code?▼
It is generally safe for short trips, but prolonged driving may cause increased emissions and potential engine performance issues. 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 the exact cause and vehicle model.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.