P2425
EGR Cooling Valve Control Circuit/Open
EGR / emissions
Generic OBD-II
Medium
What it means
P2425 means the ECM has detected an open or fault in the control circuit for the EGR cooling (cooler bypass) valve, which routes exhaust gas through the EGR cooler. Drivability is usually unaffected, but the emissions system and EGR cooling won't work correctly until the circuit is repaired.
Medium
Can I keep driving? Generally drivable — this affects EGR cooling and emissions rather than day-to-day running, but fix it to avoid higher combustion temperatures and a failed emissions test.
Common symptoms
What you'll notice
- Check-engine light on
- Usually little or no change in drivability
- Possible higher engine/exhaust temperatures
- May fail an emissions test
Common causes
Most likely first
- Faulty EGR cooler bypass valve control solenoidLikely
- Open or short in the control circuit wiringCommon
- Corroded or loose connector at the valveCommon
- Poor ground or missing supply voltage to the valveLess often
- Failed control driver in the ECMLess often
How to diagnose & fix
Work through it in order
- Read freeze-frame data and confirm the circuit fault type (open vs short).
- Inspect the EGR cooling valve connector and control wiring for damage.
- Check the control circuit for an open against spec with the key on.
- Verify the valve's power and ground.
- Replace the EGR cooling/bypass valve if it fails to respond, then clear and re-test.
FAQ
Quick answers
Is it safe to drive with P2425?+
Usually yes, since it mainly affects EGR cooling and emissions, but repair it to keep combustion temperatures and emissions in check.
Can I just clear P2425?+
It will come back once the ECM rechecks the circuit unless the valve or its wiring is repaired.
Related codes
Often seen with P2425
Read & clear P2425 yourself
Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.
✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX