Cruze p0299

The ol' P0299 turbo underboost code. Gen1 - Mechanical. I've got a 2012 Cruze LT 1.4 turbo with ~128k miles with a check engine light on. Took it to a parts store for a free scan and it came up with a P0299 "turbo underboost" code (which apparently is common with these cars). The guy said it could be a boost sensor attached to the turbo ...

Cruze p0299. 16' Cruze throwing P0299. Tags 16' cruze p0299 throwing. ... 2014 Chevy Cruze Diesel - MSR 013 17" wheels, Black Bowties, UR Rear Lower Bar 2007 Chevy Cobalt LT Coupe - M62 w/ 2.9" pulley, Header/Downpipe/Exhaust, FE5 Struts/Shocks/Control Arms/Front Swaybar, SSC Springs, ...

I don't often ask for help. P0299 HELP! This is driving me crazy, it doesn't make sense. 2012 1.4 Cruze 107k miles, original turbo. Version 2.0 intake kit, new PCV tube to turbo, recent GM valve cover (not leaking at disc) Vermont tuned. Boost leak tested with Andrei's kit. Good.

P0299 (UNDERBOOST) Hello I thought I would share my experience. I replaced my original turbo from the previous owner putting to much oil in come to find out it was also cracked about 3 inches across ( good thing I bought another). After replacing turbo to fix the sluggish car with no codes and replacing oil cooler gasket to cure a known leak …3.7K. 250K views 5 years ago. I made a quick video to explain the P0299 underboost code that you'll find on various turbo engines. While there are some application-specific explanations, …Potential causes of a P0299 turbo underboost code include: Intake (induction) air restriction or leak Failed or damaged turbocharger (sticking, binding, etc.) Faulty boost/charge pressure sensor Read more at: P0299 Turbocharger/Supercharger A Underboost Condition This is for a Gen II for others looking. How-To: Boost leak testing gen 2 1.4L ...Jan 7, 2023 · P0299 indicates that either the turbocharger or supercharger “A” shows an excessively low output. When the ECU detects a lower boost than what’s considered in the normal range, it will set the P0299 DTC. This code causes the Check Engine Light to come on, indicating that there’s a problem. When a turbo or supercharger is operating ... P0299 and P0420 issues with 2013 Chevy Cruze LTZ. Hello, I'm new to this post and this is my first post here, but I have recently purchased a 2013 Chevy Cruze LTZ six speed automatic, with 95,5xx Miles on it and have experience various issues, some slow, sluggish acceleration from a dead stop like the car is hesitating to get to higher …

P0299 cracked turbo housing at 70K. My 2014 Cruze with 70k just starting losing power and hestitating. Then it started throwing the P0299 code...the CEL would go off and then come back on. After 3 days of this I ripped the front end apart to check for leaks from the air box to intake. Found none and took it to the dealership.P0299 cracked turbo housing at 70K. My 2014 Cruze with 70k just starting losing power and hestitating. Then it started throwing the P0299 code...the CEL would go off and then come back on. After 3 days of this I ripped the front end apart to check for leaks from the air box to intake. Found none and took it to the dealership.I recently purchased a 2013 Cruze LT with 89k miles about a week ago. The day after, the code appeared while driving home on the freeway. I got home, checked the code and cleared it to see when it would come back on. It came back on two days later, hooked up the code reader but this time I accidentally cleared it again.P0299. Here we go again. Ive had a 2013 Cruze 1.4 for about 6000 miles. So far I've been lucky (turbo oil line replace, purge valve replace). Drove from Illinois to Texas yesterday for work and about half way here, check engine light came on. Just had it looked at and comes back to P0299.P015B usually means vacuum leak due to leaking valve cover. Engine running, block the breather port of the Positive Crankcase Ventilation (PCV) diaphragm on the camshaft cover with your finger. If the whistle noise stops, replace the camshaft cover assembly. P0299 often means turbocharger is has failed, here is testing information from manual.Dec 31, 2018 · A few weeks later I ran into a loss of power and p0299 code on the way to my brothers wedding trying to keep up with the group. After sitting a while to cool off, it was fine on the return trip again. What i I feel is happening with mine is that crack in the turbo is opening up when things get hot enough causing a boost leak.

P0299 Chevrolet Code - Engine Underboost. - Code Popularity: 99,040 Views. - Repair Importance Level: 3/3. - Repair Difficulty Level: 3/3. Table of contents. Created and updated by William Orellana on Jun 09, 2022. Possible Causes. Tech Notes. Description 📷.Cruze LT 1.4L. Received P0299 Engine Underboost code when diagnostics were run via a independent mechanic. Leaks were found, unknown which parts. Chevrolet is 100% overcharging - pathetic service ...I have a few issues and I'm running out of ideas therefore this is my plea for help. My car was throwing P0299 underboost code and was able to only produce 3-5 turbo PSI. I've looked into this and tried the following: - Disconnecting the turbo solenoid <> wastegate actuator vacuum hose = this would cause the car to boost up to 10-12 PSI until ...11 posts · Joined 2022. #3 · Mar 28, 2022. 200 miles since last reset, only code that remained was a permanent p0299, but the check engine light was not illuminated, computer just had to ensure that the parameters that set the code were non-existent. Got back home from work, so 250 miles total, and scanned system one more time, even the ...Support the channel making a donation at https://www.paypal.me/kaliopeIlluminated - DTC P0299, P0234, P0236, P2261, P2227, P00C7 Set Brand: Model: Model Year: VIN Breakpoint: Engine: Transmission: from to from to Buick Encore 2013 2020 — 1.4L (RPO LUV) — Chevrolet Cruze 2011 2016 Sonic 2012 2020 Trax 2013 2020 Opel Ampera 2012 2015 Vauxhall Ampera 2012 2015 Involved Region or Country North America, Europe ...

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2013 Cruze 1.4L P0299 code Jump to Latest Follow 3K views 7 replies 3 participants last post by StormShepherd Sep 22, 2020Sep 26, 2019 · As I merge onto I65, my check engine light comes on. The car does not do anything different. No decrease in acceleration, no noises or exhaust issues. I took the car to AutoZone and the P0299 code flagged. No other codes present. The following day I left for Florida and the car stayed parked for 8 days solid. The P0299 code results from low air pressure coming to the turbine of the turbocharger. The problem can be vacuum leaks, EGR issues, a damaged turbo, or a problem with the boost pressure sensor. The result is that the engine will not accelerate as it should. Depending on the vehicle, the ECU may even trigger a limp mode.Chevy Cruze código P0299. Me prendió la luz de motor de mi Chevy Cruze 1.4 turbo y lo lleve al dealer y dijeron que tenía que reemplazar el turbo y Mangueras me cobraron 2000 dólares y al día siguiente de que me lo entregaron se volvió a prender la luz regrese al dealer y me dijeron que ahora marcaba el código P2261 que es el bypass ...

Update, Turbo will make12psi boost on gauge that you can measure and feel while accelerating but ECU is shutting down boost cycle and setting code. P0299 pending. I have also bypassed my boost pressure relief solenoid to rule that out. I called our chevy dealership and they would do a smoke test $150.ChevyGuy. 7966 posts · Joined 2014. #7 · Jul 12, 2015. To run the test, the engine has to get between 2450-6000 RPM and desired boost between 19.58-31.90 PSI. The MIL won't come on until the second cycle were the test runs and fails. The MIL is turned off after 4 test cycles pass.P0299 - Engine Underboost P2227 - Barometric Pressure sensor performance I changed the Air Filter and replaced the MAF sensor with OEM (AC Delco) ... But our 2nd gen cruze's have a hose that leaves the air filter, goes down to the inter cooler and then another hose that goes up to the throttle body. I inspected that second hose …If you see the warning light in your Cruze and the scanner gives you the P0299 code, you may be sure that the problem is exactly with the turbocharger. At this point, you may ask yourself if you can drive. And the answer is not that simple. If the problem is with the boost pressure only and there are no leaks or … See moreI have a P0299 code on my 2015 1.4L (100k miles) & there seems to be a notable “whooosh” coming from the engine bay while driving, sounds similar to an external wastegate. The car is mostly stock, but does have a PCV fix kit (the one with the BNR throttle body spacer) installed around 20k miles ago. ... "Don't just drive CRUZE!" ༼∵I Have a 2015 Cruze 1.4l Turbo. And got the infamous P0299 . So I decide to do an over haul seeing that this is my wife's car and don't want to have to work on it in the future if I don't have to lol. So far I've replaced installed and upgraded -Turbo-oil drain & inlet lines-waste gate-wastegate actuator -valve cover -coil pack-laser iridium ...This particular Cruze is a 2012 1.4 Turbo but this procedure is very similar to allot of Chevy ans other years Cruze's.Recently I had been felling the car ru...The P0299 code indicates that the Turbo or Supercharger "A" has excessively low output. The ECU looks for a specific range of boost and when the low boost is detected by the ECU, it sets a P0299 code. This code will illuminate a Check Engine Light on the dashboard and may put the vehicle in limp mode. The limp mode is to prevent further damage ...Blasirl said: There are two actually PCV valves... P1101: MAF Out of Self Test Range. P1101 is one of the most common of the Chevy Cruze trouble codes. Whenever you start the vehicle, the mass airflow sensor does a self diagnostic. If the results of this test are out of range, than the P1101 trouble code is thrown.So I have been having an on and off problem with the code P0299 popping up on trips, but like I said occasionally. ... news, discussions and the best community for owners to discuss all things related to the Chevy Cruze. Show Less . Full Forum Listing. Explore Our Forums. General Discussion Gen1 1.4L Turbo Gen1 Service Issues 👋 CruzeTalk New ...

My Chevy Cruze 2016 LT engine light turned on around mid April and I had the code ran and it was p0299. Turbo boost. When I took it to the shop the light was on but the mechanics said when they brought it the engine light turned back off. They told me they couldn't do anything about it. Fast forward to now my engine light turned back on ...

Chevy Mechanic: Greg. The P0299 code needs to be checked and repaired first as this could cause the misfire code. Probable Causes. Air Filter. Air Intake System. Air Leak Between Turbocharger and Throttle Body. Turbocharger Bypass Solenoid Valve. Turbocharger Vacuum Reservoir. Turbocharger Wastegate Actuator Hoses.Potential causes of a P0299 turbo underboost code include: Intake (induction) air restriction or leak Failed or damaged turbocharger (sticking, binding, etc.) Faulty boost/charge pressure sensor ... This sounds like what is happening to my Cruze right now. I started having that power loss while on the gas awhile back almost every trip I took.Generic Diagnostic Trouble Code (DTC) P0299 indicates an underboost condition regarding your car. Join us as we define the code, discuss its severity, and provide solutions.The most profitable items to import from China have consistent demand, high margins, and low risk. We identified the 25 best items. Retail | Tip List Your Privacy is important to u...Hi there, I was looking up troubleshooting for the code P0299. It's the Turbo/ Supercharger Engine underboost. I was wondering if anyone had any advice on troubleshooting it down to the turbo itself? As well as that my wife and I both have 2013 Chevy Cruzes. About a month ago I received the warning for Service Stablitrack and the Traction ...I Have a 2015 Cruze 1.4l Turbo. And got the infamous P0299 . So I decide to do an over haul seeing that this is my wife's car and don't want to have to work on it in the future if I don't have to lol. So far I've replaced installed and upgraded -Turbo-oil drain & inlet lines-waste gate-wastegate actuator -valve cover -coil pack-laser iridium ...Customer states lack of power and slow acceleration. Check engine lamp on ECM code P0299 stored. Professional diagnostic tips. How to diagnose low turbo boos...

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As I merge onto I65, my check engine light comes on. The car does not do anything different. No decrease in acceleration, no noises or exhaust issues. I took the car to AutoZone and the P0299 code flagged. No other codes present. The following day I left for Florida and the car stayed parked for 8 days solid.My 2016 chevy Cruze has 3 codes thrown. P0101, P0299, and P1101. I've changed the MAF sensor so that is not the problem - Answered by a verified Chevy Mechanic ... Replace the valve cover assembly along with the pcv hose assembly. the p0299 is usually the first sign of the turbo charger failing, but with the other two codes there i am ...Dec 22, 2019 · Maf sensor unplugged and or intake tube is loose. The codes can present themselves even from sensor being unplugged and then plugged back in. Recheck sensor and connector and hose clamps on intake tube. And rechecking all hose clamps all the way to intake manifold. Then reset codes. Sometimes you might need to reset while running and sometimes ... P0299. Here we go again. Ive had a 2013 Cruze 1.4 for about 6000 miles. So far I've been lucky (turbo oil line replace, purge valve replace). Drove from Illinois to Texas yesterday for work and about half way here, check engine light came on. Just had it looked at and comes back to P0299.Code P0299. Jump to Latest Follow ... CruzeTalk.com forum, news, discussions and the best community for owners to discuss all things related to the Chevy Cruze. Full Forum Listing. Explore Our Forums. General Discussion Gen1 1.4L Turbo Gen1 Service Issues 👋 CruzeTalk New Member Introductions Gen1 Appearance, Body, ...2013 Chevy Cruze P0299 Code taken to dealership 3 times. The engine light came on and had the code ran at autoparts store, P0299 Turbocharger / Supercharger A Underboost Condition. This code started showing up on April 9th 2018 and took car to dealership, got the car back on April 18th 2018. Then on April 24th 2018 engine light on …Code P0299. Tags code p0299. ... CruzeTalk.com forum, news, discussions and the best community for owners to discuss all things related to the Chevy Cruze. Show Less . Full Forum Listing. Explore Our Forums. General Discussion Gen1 1.4L Turbo Gen1 Service Issues 👋 CruzeTalk New Member Introductions Gen1 Appearance, ..."P0299/000665 - Boost Pressure Regulation: Control Range Not Reached" / Exhaust Valve Control Module ... VW TDI forum, Audi, Porsche, and Chevy Cruze Diesel forum. 167.4K posts 102.9K members Since 2007 A forum community dedicated to Audi, Volkswagen, Porsche, and all turbo diesel owners and enthusiasts. Come join the discussion about ... ….

If you see the warning light in your Cruze and the scanner gives you the P0299 code, you may be sure that the problem is exactly with the turbocharger. At this point, you may ask yourself if you can drive. And the answer is not that simple. If the problem is with the boost pressure only and there are no leaks or … See moreP0299 and P0420 issues with 2013 Chevy Cruze LTZ. Hello, I'm new to this post and this is my first post here, but I have recently purchased a 2013 Chevy Cruze LTZ six speed automatic, with 95,5xx Miles on it and have experience various issues, some slow, sluggish acceleration from a dead stop like the car is hesitating to get to higher RPM's ...I just did a 2015 Cruze that was leaking at both and had the same problem at the bottom of the inlet to the throttle body. Cleaned all 3 and added a bit of grease then pulled everything tight. This Cruze had been to the dealer 3 times for P0299, works fine now and guy said he doesn't remember it having this much power ever.Causes for this P2227 code may include: Defective or damaged BAP (Barometric Air pressure) sensor. Defective or damaged electrical connector Wiring issue (e.g. open, short, corrosion) Electrical short (internal or mechanical) Loose electrical connection. Heat damage. Mechanical malfunction causing altered BAP readings.P0299 Chevrolet Cruze. Mechanic's Assistant: Im sorry to hear that youre experiencing an issue with your Chevrolet Cruze, but our Chevy Mechanic will be able to help you with the P0299 code. Have you noticed any other issues or warning lights in addition to the P0299 code? Just check engine light2011-2015 Chevrolet Cruze 2013-2015 Chevrolet Sonic, Trax Equipped with 1.4L Engine (RPOs LUJ, LUV) This PI replaces PIP5023A. ... (DTC) P0299- Engine Underboost set. This code may be set due to the loss of wastegate preload. Some wear in the wastegate actuator rod end to pin joint is normal. Wear in this joint does not affect performance and ...This video will go over the steps on how to install the Super Cruzes Wastegate Actuator.This part will resolve P0299 - Underboost and P0234 Overboost codes w...2012 Chevrolet Cruze Eco 2009 Honda Fit Sport Learn from the mistakes of others, so when you err it can be in new and interesting ways. ... 2011 Cruze 50k on it. Code P0299 Wastegate valve stuck open - car needs a new turbo and oil lines. Do not drive car on highway extended periods of time - oilk leaking into turbo. ...The most common fix for P0420 in the Chevy Cruze is a new catalytic converter, followed by an O2 sensor replacement. Before taking your Cruze into an exhaust shop for an (expensive) new catalytic converter, let's ensure that's what you need. Here's a good P0420 diagnostic order for the Chevy Cruze: 1. Check for Other Codes. Cruze p0299, 2014 Buick Encore w/ P0299, P1101, and P015B. I recently found this community and I'm grateful for all the information and wisdom that is shared here! I'm driving a stock 2014 Buick Encore with ~174k miles on it. After reading on here and watching YouTube videos, I replaced the intake manifold, valve cover, plugs, coil pack, PCV bypass hose ..., Inspect the turbocharger. Inspect the wastegate and the boost controller. Check the MAP Sensor. Run a Full Diagnostic Scan. First thing first, run a full scan of the car. While the P0299 code alone is a good indication of what's wrong with your car, it may only be a piece of a larger puzzle., Although P0299 is a generic code, repair steps may vary depending on the vehicle that you own. However, if you prefer to diagnose this code yourself, we recommend consulting vehicle-specific repair manuals or online repair databases.These resources provide helpful information on how to diagnose vehicle issues, such as an underboost …, Models: 2011-2012 Chevrolet Cruze 2012 Chevrolet Sonic With 1.4LTurbocharged Engine (RPO LUJ or LUV) The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI. ... In most cases where a P0299 DTC has set as a result of excessive clearance, it was generally around .8 mm (.032") or greater. If excessive ..., Another P0299. Hello all, looking for some extra ears. I have had my 2012 Cruze for about 4 months and I just got a low boost code, and what also feels like surging at low rpm acceleration. I had ignition issues when I bought it so it has a new coil, bkr7e gapped to .033. with my cheap scanner I was showing 5 degrees advance at full throttle ..., 2 posts · Joined 2018. #1 · Dec 20, 2020. 2013 chevy cruze throwing code p0236 and pending p2227. I clear the codes went for a test drive , everything is fine. shut it off, started it later after the engine cools down for a couple of hours and the codes are back. Any ideas??, P0299 Code Issue. Hi- New to the forum, and i have picked up a 80,000 mile 2011 cruze with the 1.4L. Always maintained. I put a cold air intake on it and just 2 weeks ago the Trifecta Tune. Everything was running great and then the check engine light came on with the P0299 code, "under boost". I didn't notice any sort of running issue or any ..., Jun 24, 2023 · Any leaks in this area can lead to oil contamination in various engine components. Check for residual oil in the intercooler: Oil residue in the intercooler can affect its efficiency and cause issues with the intake air, potentially triggering the P0299 code. Inspect the intercooler thoroughly and clean it if necessary. , Hey everyone so on the way home last night the cruze started throwing a CEL and had a huge decrease in power. Coming down the highway doing 125 km/h it... in this thread in this sub-forum in the entire site. Advanced Search ... P0299, P1100, P1206. Tags p0299 p1100 p1206 suggestions., A standard car is approximately 180 inches long. Standard vehicles may be considered compact, such as the Chevrolet Cruze, or mid-sized in design. Larger-sized vehicles comfortably..., My 2014 Cruze with 70k just starting losing power and hestitating. Then it started throwing the same code...the CEL would go off and then come back on. After 3 days of this I ripped the front apart to check for leaks. Found none and took it to the dealership. They did a great job....had it back the same day to me with a new turbook installed., Hi Molly, This code is saying that the turbo is not achieving the proper level of boost. The most common cause of this is a leak in the charged air system. Meaning the part after the turbo. So the air has been "turbo charged" and is making its way through the air ducts to the engine but it has a leak before it gets there and the air is escaping., To prevent future P0299 errors, regular maintenance of your Chevrolet Cruze is essential. This includes timely oil changes, checking the turbocharger system for leaks or damage, and ensuring all components are in good working condition., Find a Repair Shop or speak with an expert now Call (877) 314-1060. The P0299 OBD2 trouble code usually means you have an issue with your Turbo, Supercharger, Air Intake Hose, or another part. If you're not the most mechanically inclined, you may need a mechanic to help with this fault., P0299 gone after flashing back to stock. So yesterday on the way home from work my cruze throws a p0299 code and obviously then check engine light. BUT it was on the highway with cruise on and the car was running fine with no apparent issues. So when I got home I cleared the code to see if it would come back., P0299 on 2016 with 47k. I've had the car about a month, and 2 weeks ago the code came on, I checked hoses, air filter, sensor connections. Everything looks good. Code came back yesterday, reset again and it's back on today. I'm not sure what else it could be besides a bad sensor or the turbo waste gate., P0299 and P0420 issues with 2013 Chevy Cruze LTZ. Hello, I'm new to this post and this is my first post here, but I have recently purchased a 2013 Chevy Cruze LTZ six speed automatic, with 95,5xx Miles on it and have experience various issues, some slow, sluggish acceleration from a dead stop like the car is hesitating to get to higher …, Feb 18, 2021 · Hi I got the dreaded p0420 code, 2012 cruze lt. Replaced both o2 sensors, have reset code several times and it keeps coming back. I've read where lots of people have gotten a new car but it didnt solve the problem. I know the p0299 is probably a bad turbo. Have run cat cleaner and seafoam through it. The exhaust smells very strongly too. , hello, 1.4 Cruze ltz 2011 fixed turbo once already. looking for help. it has overheated due to engine outlet before , I fixed, loses maybe a few table spoons if coolant a week now. (not alot at all seriously) only codes, 0299, 0420. i even tried adding boost manually by tightening actuator arm. nothing., P0299. Here we go again. Ive had a 2013 Cruze 1.4 for about 6000 miles. So far I've been lucky (turbo oil line replace, purge valve replace). Drove from Illinois to Texas yesterday for work and about half way here, check engine light came on. Just had it looked at and comes back to P0299., Te suministramos todo lo que necesitas saber sobre el código DTC P0299 Descripción, causas, síntomas y posibles soluciones. LEER SOLUCIÓN DEL CÓDIGO O..., The P0299 code results from low air pressure coming to the turbine of the turbocharger. The problem can be vacuum leaks, EGR issues, a damaged turbo, or a problem with the boost pressure sensor. The result is that the engine will not accelerate as it should. Depending on the vehicle, the ECU may even trigger a limp mode., Subject: Malfunction Indicator Lamp (MIL) Due to DTC P0299– Loss of Turbocharger Boost Models: 2013-2015 Buick Encore 2011-2015 Chevrolet Cruze 2013-2015 Chevrolet Sonic, Trax Equipped with 1.4L Engine (RPOs LUJ, LUV) This PI replaces PIP5023A. Please discard PIP5023A. Condition/Concern, Diagnosing a p0299 code on a 2014 chevy cruze 1.4 turbo... I saw a lot of people blaming the turbo but before I just to that conclusion I did a bit of diagno..., Diagnosing a p0299 code on a 2014 chevy cruze 1.4 turbo... I saw a lot of people blaming the turbo but before I just to that conclusion I did a bit of diagno..., Chevrolet Factory Service Bulletin OBDII Code P0299 Chevrolet Cruze 2011-2016 Chevrolet Sonic 2012-2019 Chevrolet Trax 2013-2019 ... P0299 Chevrolet Code - Engine Underboost. How to Fix. Check the 'Possible Causes' listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent ..., Follow along as I show you my procedure for this diagnosis and repair.Check out https://www.handsonautotraining.com/Equipment that I use:TopDon Battery Maint..., 2013 Chevy Cruze - Runs and idles very rough. Throwing codes P0171, P0299, P0300, and P015B. We've fixed the check valves in the PCV system which were bad, but still have the problem. Also replaced the upper oxygen sensor, but didn't change anything., 2014 Chevy Cruze 1.4. Customer vehicle code p0299 it was suggested I replace the turbo when I pulled it apart the was a crack in the housing. I replaced the turbo. I drove it and it feels sluggish and the same code came back how do I diagnose the issue now., P0299 and 300 are "generic" codes and it could be a multitude of things. Might be a bad valve cover, intake manifold, coil pack, boost leak somewhere or any combination of some/all of those. Just wait until Monday and see what they say. Most likely due to a hairline fracture around the internal wastegate port., If a MECH A NIC video helped you consider donating to my patreon account to help support the channel. https://www.patreon.com/The_mech_a_nicor my paypal http..., 2011 chevy cruze 1.4 Eco 6speed manual Has 144515 km, current codes include P0171, P0299, and P0420. Ive recently (~1500km) changed the oil. Any help or direction is greatly appreciated! Also I want to note, in regards to P0171, ive done the pcv 3.3 fixkit, and replaced the valve cover. Those have each improved the performance, but im still ..., P0299 in a Chevy Trax is a code that is triggered when the car's Engine Control Module (ECM) detects an underboost condition in the car's turbocharger. This means that there's a problem in the car preventing the turbocharger from reaching its target boost level. This could be the result of a minor problem, or it could be a more serious issue ...