EGR Cooler Bypass Control Circuit Range/Performance
The P245B code indicates that the Engine Control Module (ECM) has detected a malfunction in the exhaust gas recirculation (EGR) cooler bypass control circuit. This circuit controls a valve that diverts exhaust gases around the EGR cooler to manage temperature and emissions. The ECM monitors the valve position and electrical signals; when the actual position or signal voltage deviates from the expected range, this code is set. Common causes include a faulty EGR cooler bypass valve, wiring issues, or a defective ECM.
01. Most Common Causes
- Faulty EGR cooler bypass valve
- Open or shorted wiring in the bypass control circuit
- Corroded or loose electrical connectors
- Failed ECM
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Reduced engine performance or hesitation
- Increased exhaust emissions
- Possible rough idle or stalling
03. Step-by-Step Diagnosis
Step 1: Use an OBD2 scanner to confirm the code and check for additional codes.
Step 2: Visually inspect the EGR cooler bypass valve and its wiring for damage, corrosion, or loose connections.
Step 3: Test the valve's electrical resistance and operation using a multimeter and scan tool commands.
Step 4: If the valve and wiring are okay, test the ECM output signals to the valve.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive for extended periods as it can cause reduced performance and increased emissions. The vehicle may enter limp mode, limiting speed and acceleration.
How much does it cost to fix?▼
Repair costs typically range from $150 to $400, including parts and labor. The EGR cooler bypass valve itself costs $50-$150, with labor adding $100-$250.