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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Jeffrey

28 years of experience
870 reviews
Jeffrey
28 years of experience
Nissan Maxima V6-3.0L - Alternator - Charlotte, North Carolina
Overall great experience
Kia Sorento - Car is making a noise - Charlotte, North Carolina
Jeffrey very good and I trust his work because he is precise and his work is top notch

Robert

28 years of experience
333 reviews
Robert
28 years of experience
Dodge Dakota V8-4.7L - Windows - Bowie, Maryland
Robert visited us to do work on the windows of my Mom's Dodge. Upon arrival there was confusion about our request. He assured us that he'd resolve the problem and have both windows repaired. He left to get additional parts and shortly thereafter returned to complete the job. He was professional, knowledgeable and trustworthy. For customers, its always a gamble when placing your vehicle in the hands of a new mechanic. But, with Robert, we were the winners. He is great at what he does. He is very efficient and he takes the time to explain how he resolved the problem. We are very pleased with the job he did and we'd recommend him to anyone.
Land Rover Discovery - Car is not starting - Hyattsville, Maryland
Robert was very professional and did an excellent job fixing my truck !!!!

Chris

23 years of experience
2372 reviews
Chris
23 years of experience
Mercedes-Benz G500 V8-5.0L - Car is shaking or vibrating - Newport Beach, California
Starting with an inspection, Chris knew within 30 seconds of looking under the hood what my car needed. This alone saves nth time vs. a service shop or dealer. Chris is truly connected to his expertise and willing to share it.. I sense him being challenged by our cars and isn't content until getting down to the bottom of it and then some. Again, cheers Chris !
Toyota Corolla - Car is not starting - Murrieta, California
Very knowledgeable and very thorough.

Anthony

29 years of experience
114 reviews
Anthony
29 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.

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