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  • When your engine is cold, the exhaust pressure control valve controls back pressure so that the cabin can quickly warm up. Once the PCM detects an issue with the control valve, it’ll trigger the P0475 code.
  • A bad exhaust pressure control valve can cause a P0475 code. PCM and wiring issues can also trigger the code.
  • The common symptoms of this error code include braking problems and poor engine performance. Your engine may also take too long to warm up.

The exhaust pressure control valve controls exhaust back pressure during cold start warm-up. This valve sits along the exhaust stream and is used to generate heat and oppose cylinder pressure from the engine. If the powertrain control module (PCM) detects an issue with the exhaust pressure control valve, it will set code P0475.

What Does the P0475 Code Mean?

Diagnostic trouble code P0475 stands for “Exhaust Pressure Control Valve ‘A.’”

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mechanic discovers p0475 code
P0475 is a generic powertrain code that can be logged in vehicles with an OBD-II system.

The exhaust pressure control valve plays an important role in some diesel exhaust systems. When the engine is cold, this valve controls back pressure so that the cabin can warm up more quickly.

A back pressure signal is also sent to the exhaust pressure control valve. If there is an issue with the control valve,  the PCM might log a P0475 code.

Note: The definition of code P0475 might be different depending on the vehicle manufacturer. Consult the appropriate repair manual or repair database for the exact code definition.

What are the Common Causes of the P0475 Code?

  • Faulty exhaust pressure control valve
  • PCM failure
  • Wiring issues

What are the Common Symptoms of the P0475 Code?

How to Diagnose the P0475 Code

P0475 is a generic powertrain code that can be logged in vehicles with an OBD-II system. However, keep in mind that the steps for diagnosis and repair can vary, depending on vehicle specifications.

Diagnosing trouble codes also involves using certain tools and conducting visual inspections on certain parts. If you’re new to the procedure, it might be best to have a certified mechanic do the job for you instead. But if you know how to work your way around diagnosing trouble codes, then you can go ahead and do it yourself.

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To help you get started, here is a video that shows what the process usually involves.

How to Fix the P0475 Code

Attempting to fix a P0475 code can be frustrating if you don’t have the technical knowledge and DIY skills to fix the problem yourself. Under these circumstances, it might be best to have a trained professional do the job for you.

But if you’re a seasoned DIYer, make sure to have the right tools and information before you begin working on your vehicle. Guides like those from Chilton or an ALLDATA subscription contain vehicle-specific repair information, which can be handy in resolving trouble codes like the P0475.

Where to Get a New Exhaust Pressure Control Valve to Fix P0475

Failing to address DTC P0475 leads to many problems including, but not limited to, poor engine performance and braking problems. If you’ve confirmed that a faulty exhaust pressure control valve triggered the code, don’t put off replacing it. Find a compatible replacement at with just a few clicks.

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The best part? You can get your hands on a new exhaust pressure control valve without leaving your house. Simply visit our website and use our vehicle selector to check out compatible parts. Then, funnel the catalog results according to your preferences using the search filters.

Our auto parts come from the most trusted manufacturers in the industry, and each item is carefully selected by a team of professionals. What’s more, you’ll find only the best prices when you shop from us. All our products come with a low-price and lifetime replacement guarantee, helping you get the best value for your money.

Don’t hold off on fixing DTC P0475. Get your hands on a replacement exhaust pressure control valve that’s built to last. Shop now!

About The Authors
Written By Automotive and Tech Writers

The Research Team is composed of experienced automotive and tech writers working with (ASE)-certified automobile technicians and automotive journalists to bring up-to-date, helpful information to car owners in the US. Guided by's thorough editorial process, our team strives to produce guides and resources DIYers and casual car owners can trust.

Reviewed By Contact Center Manager and Technical Reviewer at

William “Bill” Guzenski has produced hundreds of how-to videos for the automotive community. He’s an ASE Certified Master Automobile Technician, and is affiliated with the Specialty Equipment Market Association (SEMA). He loves attending race events and car shows throughout the country, as well as traveling in his 40-foot motorhome, exploring abandoned mines and ghost towns.

Any information provided on this Website is for informational purposes only and is not intended to replace consultation with a professional mechanic. The accuracy and timeliness of the information may change from the time of publication.

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