P2427
EGR Cooling Valve Control Circuit High
Exhaust gas recirculation (EGR)
Generic OBD-II
Medium
What it means
P2427 means the ECM detected high voltage — usually an open circuit — in the control circuit for the EGR cooling (cooler-bypass) valve. It rarely changes how the car drives, but it affects emissions and exhaust-temperature control. Common causes are a failed valve, an open control wire, or a bad connector.
Medium
Can I keep driving? Usually drivable, though you may notice minor performance or emissions issues; a stuck EGR cooler valve can raise exhaust temperatures over time.
Common symptoms
What you'll notice
- Check-engine light on
- Often no noticeable change in driving
- Possible minor loss of performance or higher exhaust temperature
- May fail an emissions test
Common causes
Most likely first
- Faulty EGR cooling (cooler-bypass) valve or its control solenoidLikely
- Control circuit open — a 'high voltage' reading usually means an open circuitCommon
- Corroded or disconnected connector at the valveCommon
- Wiring break between the ECM and the valveLess often
- ECM/PCM control driver fault (less common)Less often
How to diagnose & fix
Work through it in order
- Read freeze-frame data and confirm the code is current.
- Inspect the EGR cooling valve connector and control wiring for opens or corrosion.
- Check continuity of the control wire between the ECM and the valve.
- Test the valve/solenoid resistance against spec.
- Replace the EGR cooling valve if the wiring is good, then clear and re-test.
FAQ
Quick answers
Is it safe to drive with P2427?+
Short-term, usually yes. But the EGR cooler valve helps manage exhaust temperature, so have it repaired to avoid emissions or heat-related issues.
Can I just clear P2427?+
It returns once the ECM sees the open control circuit again. Fix the valve or its wiring first.
Related codes
Often seen with P2427
Read & clear P2427 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