My car only has 43K on it and is 100% stock down to the paper filter. Was getting onto the highway, floored it in 3rd and it just fell flat and popped a CEL. Read the code when I got home and it is showing P0299. I looked under the hood, everything looks to be secure, the bottom of the intercooler doesn't look like it took any hits. Took it out again this morning, started off boosting again and then 10 minutes into the drive and no boost again. Not throwing a code this time though. Any suggestions on what could cause this situation.

 

Condition
Some customers may comment that the SES light is on. Upon inspection, you may find DTC P0299 (Turbocharger Engine Underboost) or P0234 (Turbocharger Engine Overboost) set.

Cause
This condition may be caused by a mis-adjusted wastegate.

Correction
Note: The wastegate adjustment is sometimes a very fine process. When adjusting the wastegate, only small adjustments should be made. Loosen one nut at a time and only adjust the nut one turn at a time; then tighten the other nut against the shaft and test drive to verify. This may have to be performed several times to achieve the desired boost level. To ensure proper adjustment, the vehicle should be at full operating temperature when testing. The vehicle will be very hot and may need to cool between adjustments. Too large of an adjustment can cause repeat DTCs.

 

Sounds like you may have a boost leak somewhere and when its detected it puts you into a limp home or safety mode.

 

Thanks for the replies. So I'm hearing a whistling sound when I give it gas so would that make you lean more towards a boost leak or a mis-adjusted waste gate?

 

Boost leak would be my best guess, wastegate noise would still all be contained in the turbine housing.

 

@SilverSS2008 Did you ever determine the cause of the problem? I am getting the same code, P0299 along with a P2178 code, that both accompany the car cutting throttle on its own and entering low power mode (1-2psi max)

 

Yes i did. It was the boost solenoid that sits on the top of the manifold. 5 minute job to swap it out and car was back to normal. Good luck!