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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Michael

15 years of experience
518 reviews
Michael
15 years of experience
Mercedes-Benz GL450 - Brake Pads Replacement (Rear) - Atlanta, Georgia
Micheal was punctual and friendly. Work was completed within promised time. Will definitely use again.
Volvo S80 - Brake Pads Replacement (Front) - Roswell, Georgia
Michael was SUPER QUICK with doing my brake and rotors. Great communication throughout the whole process. Will always recommend

Kenneth

19 years of experience
509 reviews
Kenneth
19 years of experience
Toyota Sequoia - Brake Pads Replacement (Front) - Newport Beach, California
Kenneth did a great job and very knowledgeable. He has a great attitude and I will for sure be using him again.

Chuy

13 years of experience
129 reviews
Chuy
13 years of experience
Honda Civic - Brake Pads Replacement (Front, Rear) - Cicero, Illinois
Excellent work on doing the breaks for my car and the break and steering system flush I’ll definitely recommend and take into consideration for chuy’s work whenever I need a fix on my car

Richard

16 years of experience
72 reviews
Richard
16 years of experience
BMW 328i - Brake Pads Replacement (Rear) - Dublin, California
Richard was an outstanding mechanic. After he arrived, the first thing he did after taking the initial pictures of the car is an assessment into what work was asked. He quickly verified that I did not need brake fluid and my front brakes even-though it affects his personal commitments and time, which I think is highly appreciate and thorough professional. He was detailed oriented - took time to make sure that all the issue are fixed. He paid attention to detail in overall car assessment- he goes above and beyond. He was also teaching me through the process which I found highly educational and appreciate him providing the information ensuring and making me comfortable what he was doing and explaining patiently all the questions that was thrown at him. When he works - you know he's highly skilled and experienced and knows his stuff. He is highly experienced. He is a "Master" mechanic in true sense :)

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