Exhaust Gas Recirculation Cooling Valve Control Circuit Open
What does P2425 mean?
The P2425 code means the vehicle's onboard diagnostic system has detected: Exhaust Gas Recirculation Cooling Valve Control Circuit Open. This is a moderate severity code.
Common Symptoms
- Check Engine Light illuminated
- Increased NOx emissions
- Engine knocking under load
- Reduced fuel economy
- EGR cooler not regulating temperature
Probable Causes (Ranked by Likelihood)
- Failed EGR cooler bypass valve Very High
- Damaged wiring to EGR cooling valve High
- Corroded connector at EGR cooling valve Moderate
- Blown fuse for EGR cooler circuit Low
Step-by-Step Diagnostic Procedure
-
Check the EGR cooler valve fuse
-
Inspect wiring and connector at the EGR cooling valve
-
Measure the valve solenoid resistance
-
Command the valve with a scan tool to verify operation
-
Check for coolant leaks at the EGR cooler assembly
Frequently Asked Questions
Can I drive with code P2425?
Short distances only. Without proper EGR cooling, combustion temperatures can be higher than designed, which increases wear on engine components.
What causes P2425?
Usually a failed EGR cooler bypass valve or damaged wiring. This code is most common on diesel trucks with EGR cooler systems.
Is P2425 expensive to fix?
Typically $200 to $800. The bypass valve itself is moderately priced but EGR cooler replacement on diesel engines is more labor intensive.