EGR Valve Stuck Open
The P2391 code means the vehicle's onboard diagnostic system has detected: EGR Valve Stuck Open. This is a moderate severity code.
- Keep driving?
- Short distances only
- DIY difficulty
- moderate
- Estimated cost
- $150 - $450 (parts and labor)
Best-selling code reader on Amazon. Reads and clears check engine codes on any 1996+ vehicle. Under $30.
Essential for diagnosing sensor codes, checking voltage, and testing circuits. Under $15 and pays for itself on the first job.
Affiliate links — we earn a commission at no extra cost to you.
Common Symptoms
- Check Engine Light on
- Rough idle and possible stalling
- Increased NOx emissions
- Engine may surge or run unevenly
- Reduced fuel economy
Probable Causes (Ranked by Likelihood)
- Carbon buildup holding EGR valve open Very High
- Faulty EGR valve with stuck plunger High
- Vacuum line leak keeping valve actuated Moderate
- EGR solenoid stuck in energized position Low
Frequently Asked Questions
What does P2391 mean?
P2391 indicates an EGR (Exhaust Gas Recirculation) system issue: EGR Valve Stuck Open. The EGR system reduces nitrogen oxide emissions by recirculating a portion of exhaust gas back into the intake.
Can I drive with P2391?
You can drive short distances. The engine may run rough or ping under load, and emissions will be higher than normal. Schedule a repair soon.
How much does it cost to fix P2391?
Most EGR repairs cost $150 to $450. Cleaning the valve may be sufficient ($100-$200), while a full replacement runs $200-$450.
Mechanics Guide Step-by-step diagnosis
Step-by-Step Diagnostic Procedure
-
Scan for P2391 and review freeze frame conditions
-
Inspect EGR valve for carbon buildup and free movement
-
Test EGR sensor B signal voltage and compare to specifications
-
Check EGR passage and tube for blockage or restriction
Sources 1
This page is built from documented references. Verify against your own service info before repair work.
- SAE J2012Diagnostic Trouble Code Definitions (defines the generic OBD-II code ranges)
Commonly Affected Vehicles
- 2014-2022 Chevrolet Silverado 1500 6.2L V8
- 2012-2019 Toyota Camry 3.5L V6
- 2015-2023 Ford F-150 3.5L EcoBoost V6
- 2007-2015 Chevrolet Silverado 1500 5.3L V8
Related Codes
Explore More
Was this helpful?
Send this to whoever is fixing the car — your mechanic, or the person asking what the light means.