P245C: EGR Cooler Bypass Control Circuit Low
The P245C code indicates that the Powertrain Control Module (PCM) has detected a low voltage condition in the exhaust gas recirculation (EGR) cooler bypass control circuit. This circuit controls a valve that bypasses the EGR cooler to manage exhaust gas temperature. A low voltage signal suggests a short to ground, open circuit, or faulty component, which can affect engine performance and emissions.
01. Most Common Causes
- Faulty EGR cooler bypass valve
- Short to ground in the control circuit wiring
- Open circuit in the control circuit wiring
- Corroded or damaged connector
- Failed PCM (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 an OBD2 scanner to confirm the code and check for related codes.
Step 2: Visually inspect the EGR cooler bypass valve and its wiring/connector for damage or corrosion.
Step 3: Test the valve's resistance with a multimeter (specs vary; typically 20-30 ohms).
Step 4: Check for voltage at the valve connector with the engine running (should be near battery voltage).
Step 5: If voltage is low, trace the circuit for shorts or opens; repair as needed.
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 performance and increased emissions. Immediate diagnosis is advised.
How much does it cost to fix?▼
The cost typically ranges from $50 to $150 for diagnosis and repair, depending on the cause and labor rates.