Skip the auto shop - Our mechanics make house calls

Symptoms of a Bad or Failing EVP Shut Off Solenoid

evp shutoff 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.

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
Still not sure about your car's issue?
Diagnose your car
What kind of issue are you experiencing?
Brakes are squeaking
Car is not starting
Car is overheating
Car is shaking (vibrating)
Fluids are leaking
Heating and A/C
Smoke or steam is coming out of the car
Warning light is on
Icon-warranty_badge-02

Skip the repair shop, our top-rated mechanics come to you.

At your home or office

Choose from 600+ repair, maintenance & diagnostic services. Our top-rated mechanics bring all parts & tools to your location.

Fair & transparent pricing

See labor & parts costs upfront, so you can book with confidence.

12-month, 12,000-mile warranty

Our services are backed by a 12-month, 12,000-mile warranty for your peace of mind.

Get A Quote

Need Help With Your Car?

Our certified mobile mechanics make house calls in over 2,000 U.S. cities. Fast, free online quotes for your car repair.

GET A QUOTE

More related articles

P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
The Traveler’s Guide to Driving in Malaysia
CraigBurrows / Shutterstock.com Malaysia is a popular destination for many tourists today. The country has amazing sights and attractions that you will want to explore....
P2159 OBD-II Trouble Code: Vehicle Speed Sensor B Range/Performance
Diagnostic Trouble Code (DTC): P2159 P2159 code definition Vehicle Speed Sensor B Range/Performance...


Related questions

Q: steering failure.

If the inner tie rod were to break or come loose, there is a chance steering the vehicle would become very difficult. Hire a technician to inspect the previous work done as well as check for new damage that may...

Q: I need to know if I am being ripped off

They sell a kit for $85 via Bonanza for your Audi A4. A timing chain solenoid replacement usually calls for about ~5.1 hours of labor which can average out to around $100 per hour. So I would expect around $800...

Q: Knocking noise from front tire

It would be helpful to know why were the components you mentioned were replaced in the first place. There are a few more components in the front end that could cause this issue. Problems with the sway bar links are...