Symptoms of a Bad or Failing Exhaust Pressure Control Valve

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The exhaust pressure control valve is an emissions component that is commonly found on many road going cars and trucks. It is a part of the EGR system, an emissions system that is designed to recirculate exhaust gases back into the engine, when the correct conditions are met, to reduce cylinder temperatures and reduce NOx emissions. One of the main components of the EGR system is the exhaust pressure control valve. The exhaust pressure control valve detects changes in the pressure of the exhaust gases to properly control the flow of exhaust gases through the EGR system. They are commonly found on vehicles equipped with turbo diesel engines, however they can also be found on the EGR system of gasoline engines as well. When the exhaust pressure control valve fails or has an issue, it can cause problems with the operation of the EGR system, and even affect engine performance. Usually a problem with the exhaust pressure control valve will produce a few symptoms that can alert the driver of a potential issue.

1. Decrease in power, acceleration, and fuel efficiency

One of the first symptoms of a problem with the exhaust pressure valve is engine performance issues. If the valve becomes stuck or blocked it can affect engine performance. A faulty exhaust pressure valve may cause the vehicle to experience a reduction in power, acceleration, fuel efficiency, and in some cases even hard starting.

2. Excessive smoke or soot from exhaust

Another symptom of a potential problem with the exhaust pressure valve is excessive smoke or soot from the exhaust. For diesel engines equipped with them, the exhaust pressure valve plays an important role in the proper engine combustion. Issues with it can disturb the already delicate combustion process of diesel engines, which can cause black smoke and soot to be expelled from the exhaust pipe.

3. Check Engine Light comes on

An illuminated Check Engine Light is another symptom of a possible problem with the exhaust pressure valve. If the computer detects an issue with the exhaust pressure valve’s circuit, signal, or position, it will set off a Check Engine Light in order to alert the driver of a potential issue. A Check Engine Light can also be set off by a wide variety of other issues, so having the computer scanned for trouble codes is highly recommended.

Exhaust pressure valves play an important role in the operation of the EGR system and can affect engine performance and emissions when they have an issue. If you suspect that your vehicle’s exhaust pressure valve may be having an issue, have the vehicle inspected by a professional technician, such as one from YourMechanic, to determine if the car needs an exhaust pressure control valve replacement.


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18 years of experience
390 reviews
Eduardo
18 years of experience
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Came early, communication was excellent, has a great set up with his truck and tools, was very pleasant and professional, overall great experience
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Very knowledgeable and very pleasant person to work with. Took his time to inspect the car in detail. Very satisfied with his work.

MICHAEL

32 years of experience
171 reviews
MICHAEL
32 years of experience
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Did everything he could to track down a emissions code, after all recommended to replace a bad PCM.

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Brandon was friendly and polite and he even was so kind enough to change time services for a later date. He definitely provided me with a lot of advise and just some of her personal experiences with working on vehicles. I really did appreciate the time and patience he took with my car to get it up and running again.

Juan

18 years of experience
36 reviews
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