Oct 19, 2003 · If you get a CEL / Emissions Workshop message, have the code read and it comes back with P0299 turbocharger underboost - please post what you did to resolve the problem to this thread. …

Jul 12, 2020 · P0299 Turbo Underboost Issue 1 reading Jump to Latest 133K views 35 replies 17 participants last post by roadrunner420 Aug 5, 2025

Jun 5, 2023 · My engine light came on again and it says P0299, I already replaced all the vacuum lines, and the N75 valve. Can anyone tell me where to start? Here’s a picture of around the egr valve …

Jan 26, 2010 · Underboost P0299 1556 Issue and Resolution There are a lot of threads indicating problems with underboost, but not many with resolutions. Mine is a 03 Jetta. The symptoms were the …

May 1, 2024 · Hello, I have a 2012 Jetta TDI 2.0 stock engine with around 220k miles on it. I've had this car for many years and have given her just standard maintenance aside from the few diesel gate …

Oct 11, 2024 · The story so far goes: Just purchased this car for a steal about 2-3 weeks ago, been driving it to and from work 100km each way, and am experiencing an underboost limp mode code …

Jun 25, 2023 · Code # P0299 (#3) An unlucky number of gm owners with this 4-cylinder engine (and possibly any small engine with a turbo) appear to have turbo issues I do not know the failure rate, it …

Sep 11, 2025 · Hopefully someone else has experienced this. I have a 2019 Ram 2500 Cummins and when I first drive it in the morning it seems like it has a hard time building boost and will throw code …

Jan 26, 2010 · 9 hours later on P0299 turbo underboost I was working a 2005 Passat TDI with 246,000 miles. Presented with the infamous P0299 code plus P0741 (torque converter!). Since the owner …

Jun 4, 2025 · Said P0299 and the likely solution was the Turbocharger By-Pass Valve. Usually there’s a picture printed on what you need to get but there wasn’t this time and they didn’t have any in stock.