Customers often call us with questions about these three common fault codes for their newer TDIs. This article details what each code means and what needs to be done to fix the problem.

2005+ VW TDIs–Fault codes P2112, P2015

These codes correspond to a problem with the throttle body regulating flap, otherwise known as an anti-shudder valve. This flap helps regulate the air intake.

If you get a check engine light and this code, this part has most likely failed. Many TDI drivers have reported this problem. A tooth on the gear that opens and closes the flap gets worn down, and the flap gets stuck. If it’s stuck in the closed position, your car won’t start.

On the common rail cars (2009+), you can’t simply replace the flap/motor, you have to replace the whole intake manifold. There’s a DIY on how to fabricate your own gear tooth floating around on the internet, but we wouldn’t recommend it, as it sounds like a temporary fix at best.

Common Rail Cars (2009+)–P047F, P046C, P048A

If you get any of these codes (or a variation on them), you’re having an issue with your Exhaust Flap. This part is designed to create backpressure to help aid the EGR during boost. It often gets stuck and has a high failure rate, as reported by many TDI drivers. VW realized that their product had a design flaw and released a service bulletin (TSB 2031583/5) that extended the warranty to 10 years or 120,000 miles, whichever comes first.  If you’re out of warranty, you can always do it yourself.