EGR Cooler Bypass Control Circuit High
The P245D code indicates that the Engine Control Module (ECM) has detected a high voltage condition in the exhaust gas recirculation (EGR) cooler bypass control circuit. This circuit controls a valve that diverts exhaust flow around the EGR cooler to prevent overcooling and condensation. A high voltage reading typically points to a short to power, open circuit, or faulty component in the solenoid or wiring.
01. Most Common Causes
- Faulty EGR cooler bypass solenoid
- Short to power in the control circuit wiring
- Open circuit or high resistance in the wiring or connector
- Corroded or damaged electrical connector
- Failed ECM (rare)
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 a scan tool to confirm P245D and check for related codes.
Step 2: Visually inspect the EGR cooler bypass solenoid and wiring for damage, corrosion, or loose connections.
Step 3: Test the solenoid resistance with a multimeter; compare to manufacturer specs (typically 20-40 ohms).
Step 4: Check for voltage at the solenoid connector with key on; should be battery voltage on one pin and ground on the other when commanded.
Step 5: If wiring and solenoid are good, test the ECM output circuit for shorts or opens.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is generally safe for short trips, but prolonged driving may cause reduced performance, increased emissions, and potential damage to the EGR system. 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 solenoid or wiring needs replacement. Diagnostic fees may add $50-$100.