Symptoms of a Bad or Failing EVP Shut Off Solenoid

Many modern engines are equipped with EGR systems to help lower vehicle emissions. The EGR system’s purpose is to recirculate exhaust gas back into the engine so that they can be reburned, reducing cylinder temperatures and NOx emissions. The EGR system uses a combination of sensors and solenoids to control the flow of the exhaust gases for maximum engine efficiency.

One of these solenoids is the EVP shut off solenoid. The EVP shut off solenoid is one of the main components used to control the flow of the EGR system. The computer continuously monitors the pressure and temperature of the EGR system and will activate the EVP shut off solenoid when the correct conditions are met. When the EVP shut off solenoid fails, the EGR system can remain open and flowing, even when it is not desirable for it to do so. Usually a bad or failing EVP shut off solenoid will produce a few symptoms that will alert the driver of a potential problem that should be serviced.

1. Poor cold start performance

One of the first symptoms of a problem with the EVP shut off solenoid is poor cold start performance. If the EVP solenoid fails the EGR valve can remain permanently opened. This can cause the vehicle to experience rough idle and even hard starting, especially during cold starts.

2. Check Engine Light comes on

Another symptom of a bad or failing EVP shut off solenoid is an illuminated Check Engine Light. If the computer detects a problem with the EVP shut off solenoid circuit it will set off the Check Engine Light to alert the driver of an issue. The Check Engine Light can also be activated by a wide variety of other issues so having the vehicle scanned for trouble codes is highly recommended.

3. Failed emissions test

Another symptom of a problem with the EVP shut off solenoid is a failed emissions test. The EVP shut off solenoid is a part EGR system, which is designed to reduce NOx emissions. A bad solenoid may compromise the functionality of the entire EGR system, which can cause the vehicle to fail an emissions test due to excessive NOx emissions. For states with strict emissions regulations, this may render the vehicle legally undriveable until the problem is fixed.

The EVP shut off solenoid is an important component in maintaining the proper functionality of the EGR system. Any problems with it can compromise the effectiveness of the EGR system and cause excessive NOx emissions. For this reason, if you suspect that your EVP shut off solenoid may be having an issue, have the vehicle inspected by a professional technician, such as one from YourMechanic, to determine if the component should be replaced.


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Recent Exhaust and Emission System Inspection reviews

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Pedro

22 years of experience
33 reviews
Pedro
22 years of experience
Infiniti Q60 V6-3.0L Turbo - Exhaust and Emission System - Woodland Hills, California
Very professional and honest. Was fortunate to have him be the one to show up. Thank you Pedro!

Anthony

28 years of experience
113 reviews
Anthony
28 years of experience
Hyundai Sonata L4-2.4L - Exhaust and Emission System - Moriches, New York
Anthony was very knowledgeable in diagnosing the problem with my car. explained everything that needed to be done in terms that I could understand. I would use this service again.

MICHAEL

33 years of experience
184 reviews
MICHAEL
33 years of experience
Mercury Mountaineer V6-4.0L - Exhaust and Emission System - Philadelphia, Pennsylvania
Did everything he could to track down a emissions code, after all recommended to replace a bad PCM.

Peter

25 years of experience
514 reviews
Peter
25 years of experience
Hyundai Genesis Coupe V6-3.8L - Pre-purchase Car Inspection - Simi Valley, California
Peter was great to work with. He explained everything I needed to know before purchasing the car. He was able to spot things that I would not have noticed when I saw the car. I felt very confident after the appointment and Peter was very patient to go over all the details.

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