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 diverts exhaust gases around the EGR cooler to manage temperature. A low voltage reading suggests a short to ground, open circuit, or faulty component in the solenoid or wiring.
1. Most Common Causes
- Faulty EGR cooler bypass solenoid
- Short to ground in the control circuit wiring
- Open circuit or damaged connector
- Failed PCM (rare)
2. Symptoms You Will Notice
- Check Engine Light illuminated
- Reduced engine performance or power loss
- Increased exhaust emissions
- Possible rough idle or hesitation
3. Step-by-Step Diagnosis
Step 1: Scan for additional codes and freeze frame data.
Step 2: Visually inspect the EGR cooler bypass solenoid and wiring for damage or corrosion.
Step 3: Test the solenoid resistance with a multimeter (compare to specs).
Step 4: Check for voltage at the solenoid connector with key on; if low, trace circuit for shorts or opens.
4. 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. The vehicle may enter limp mode.
How much does it cost to fix?▼
Typically $50-$150 for parts and labor, but can vary if the PCM needs replacement.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.