A broken brake booster hose will also cause this code and limp mode. Part of the hose is hard plastic and is susceptible to cracking and/or breaking. Ask me how I know.
FYI I had this code ( '14 jetta 1.8 tsi) and a very surprising fix, I'd get p29900 and epc with heavy throttle, especially under load. Acceleration was weak and turbo had leak test showing no leak no acuator issue. Was going to try to replace Diverter valve as last idea. I replaced all my sensors but the CRANKSHAFT SENSOR. I swapped it for a new one since I already had the car on stnads not thinking it would affect much and seems to have completely fixed it. Back to normal accerlation, no EPC or codes even if I redline, and the weird noise with heavy throttle before that sounded like boost leak or tubro issue seems to be gone. If you haven't tried Crankshaft sensor or you have stock sensor and higher mileage could be WELL worth a new sensor! 2014 jetta 1.8 tsi, 150k mi
P29900? I am getting a P0299. Just had my epc pop on today and have been trying to figure it out. Within the last few days it did feel like I needed a new cam shaft sensor and then this. Might swap that and see if it was the issue.
replaced the actuator and still have the same issue- before it was burning white smoke when I drove- now its not but I still have the same glow plug flashing and same code and no boost.- Any recommendations?
Mate, you’re supposed to adjust this actuator with vag software. It’s not just measuring a length of pin only. Wrong adjustment may case a engine failure. FYI under pressure you should have 0.65- 0.85v and without pressure 3.40-3.80v.
Thanks for the voltage ranges. I don't have VAG software so I pushed needles through the wires and measured the values with a multimeter and they were correct. I setup the nut to the same position on the old actuator but it was good the check.
just a quick one, what are the signs that it is the diaphragm. like can you visually see it’s faulty or is it internally split? also would this cause an intermittent underbody fault?
You can’t see it but if you put your finger over the vacuum hole and move the actuator then you should feel the suction. If you don’t then the diaphragm is split.
Sounds like you’ve had a bad time with it. The things to check would be - -Vacuum leaks / split vac line. - Boost leak from intake side (smoke test would confirm this) -Faulty actuator . - Faulty N75 valve. - Faulty boost pressure valve. -Sticking turbo veins, either carbon clean or spray mr muscle in the top of the turbo through the egr hole. Or fit a new turbo with new actuator attached. Thats the main things I’d check.
Liked for " measure your shaft and adjust your nuts. You're good to stick it back in"
A broken brake booster hose will also cause this code and limp mode. Part of the hose is hard plastic and is susceptible to cracking and/or breaking. Ask me how I know.
This is what happened to me. But I’m still getting a p0299 and now a p00af. Any input?
FYI I had this code ( '14 jetta 1.8 tsi) and a very surprising fix, I'd get p29900 and epc with heavy throttle, especially under load. Acceleration was weak and turbo had leak test showing no leak no acuator issue. Was going to try to replace Diverter valve as last idea. I replaced all my sensors but the CRANKSHAFT SENSOR. I swapped it for a new one since I already had the car on stnads not thinking it would affect much and seems to have completely fixed it. Back to normal accerlation, no EPC or codes even if I redline, and the weird noise with heavy throttle before that sounded like boost leak or tubro issue seems to be gone. If you haven't tried Crankshaft sensor or you have stock sensor and higher mileage could be WELL worth a new sensor! 2014 jetta 1.8 tsi, 150k mi
This is my issue with my 2019 Jetta 1.4
P29900? I am getting a P0299. Just had my epc pop on today and have been trying to figure it out. Within the last few days it did feel like I needed a new cam shaft sensor and then this. Might swap that and see if it was the issue.
Any update man?@@1987willyboy
I have this code, along with a small amount of smoke coming from the back of the engine (2012 1.6 tdi Golf)... Along with code P2279... Why ideas?
replaced the actuator and still have the same issue- before it was burning white smoke when I drove- now its not but I still have the same glow plug flashing and same code and no boost.- Any recommendations?
It could be the pressure converter valve or the n75 valve.
Did you solve your issue with white smoke was it pressure converter
How did you solve the matter?
Mate, you’re supposed to adjust this actuator with vag software. It’s not just measuring a length of pin only. Wrong adjustment may case a engine failure. FYI under pressure you should have 0.65- 0.85v and without pressure 3.40-3.80v.
Thanks for the voltage ranges. I don't have VAG software so I pushed needles through the wires and measured the values with a multimeter and they were correct. I setup the nut to the same position on the old actuator but it was good the check.
just a quick one, what are the signs that it is the diaphragm. like can you visually see it’s faulty or is it internally split? also would this cause an intermittent underbody fault?
You can’t see it but if you put your finger over the vacuum hole and move the actuator then you should feel the suction. If you don’t then the diaphragm is split.
I have an Amrok UTE with this code P0299 I have changed both turbos but still get this what can I still check.
Brother, i am getting P0299 code on my volkswagen passat 2016. Code is showing P0299 Turbocharger/supercharger A underboost condition.
Did you fix your problem?
Just got this one today on my 2017. Trying to find the culprit. Did you figure out your issue?
i have underboost issue, but mechanically everything works correctly but 0 boost is created. Turbo spins freely
If it’s not the diaphragm on your actuator then I’d check your n75 / boost pressure sensor. Then check for boost leaks.
@@BarnClubCars thank you, will do so
@@InBoostWeTrust7MGTE what came out of it?
How to solve the case golf 7 GTD
Did you ever get it fixed ?
What if you’re getting this code and car ain’t starting ?
My Vw T5 2.5 BPC keeps throwing this code up fed up of taking it to mechanics now spent over 2k+ sourcing it and no better off
Sounds like you’ve had a bad time with it.
The things to check would be -
-Vacuum leaks / split vac line.
- Boost leak from intake side (smoke test would confirm this)
-Faulty actuator .
- Faulty N75 valve.
- Faulty boost pressure valve.
-Sticking turbo veins, either carbon clean or spray mr muscle in the top of the turbo through the egr hole. Or fit a new turbo with new actuator attached.
Thats the main things I’d check.