![]() ![]() For example, the GM service bulletin 18-NA-355 for the 8-speed 8L90 transmission recommends flushing the transmission to fix 'Shake and/or Shudder During Light Throttle Acceleration Between 25 and 80 MPH'. Change the transmission fluid more often using recommended fluid at your GM dealer. We recommend an extended warranty that doesn't have a low limit per claim (e.g., $1000 per claim) as replacing the transmission can cost over $4,000.Ģ. Consider buying an extended powertrain warranty that will cover engine or transmission repairs. When buying a used Sierra, watch out for slipping, shudder, harsh shifting and other transmission issues during the test drive, read more in this article. There are several ways to address transmission problems:ġ. In the 6-speed 6L80 transmission many problems are caused by the torque converter. However, many owners report that some transmission problems have been repaired while under warranty. Transmission issues: Consumer Reports rates the transmission reliability 'below average' for all model years of this generation of the Sierra/Silverado 1500. For the 8-speed transmission, GM recommends changing the transmission fluid, see the bulletin 18-NA-355 (link below). Some GM truck owners even suggest upgrading the driveshaft with a heavy-duty part. For example, watch this video.Īnother thing that can potentially cause vibration is the driveshaft. Tires also need to be checked for runout. The first thing to try is to balance all 4 tires it may help in some cases. Vibration at highway speeds: (Google 'Chevy shake'). A vent valve or a purge valve are not too expensive to replace. The service bulletin 15-06-04-002 for the 2014 Sierra 1500 recommends if the CVS valve is the cause, replacing it with an updated design. ![]() The vent tube that goes out from the EVAP canister towards the filler neck has a filter that needs to be checked for blockage. Your mechanic will have to do some testing of the EVAP system with a scan tool. A problem with the purge valve can cause this code too. One common failure part is the EVAP canister vent solenoid valve (CVS) that is located at the EVAP canister. The code P0446: This code is related to the EVAP system. Here is a good Youtube video explaining the diagnosis the suspected cause is excessive carbon buildup. Mechanics use advanced scan tools that can show the misfire count of each cylinder, making the diagnosis easier. A dirty throttle body, a vacuum leak (e.g., from intake manifold gasket) or even a bad ground connection can also cause this code. The scan may reveal the trouble code P0300 - random misfire.Ĭommon causes of this code include old spark plugs and wires, a bad ignition coil, bad fuel injector, carbon buildup on the injectors and intake valves. If you are buying a used GMC/Chevy truck, test the A/C in all modes.ĥ.3L V8 Code P0300: The truck may run rough and the Check Engine light will stay on or sometimes flash on and off. Here is a good video that explains replacement of the A/C condenser. Other potential leak spots include A/C lines, joints and the compressor. If the leak is not obvious, your mechanic will have to do some testing for example, adding a leak detection dye into the system, recharging it and testing for leaks. The good news that replacing the A/C condenser is not very difficult (1.0-1.2 hours of labor in the shop), aftermarket parts are not too expensive and any shop working with A/C can handle this repair. It is a common sign of A/C refrigerant leak. Sometimes you can actually see through the grille an oily spot or a greenish residue on the condenser itself, typically on the driver's side. The condenser is a heat exchanger located in front of the radiator behind the grille. Watch these Youtube videos to have an idea.Ī/C Not working: The one common thing that can cause the air conditioner not to work is a leaking A/C condenser, especially in the 20 model years. Here is the link to the bulletin at the NHTSA website it shows photos and explains what to check for mechanics.įrom our experience, we know that a corroded/loose ground connection can cause many electrical issues. These include: Service Stabilitrak message, stalling, no-start, displays go blank, steering wheel jerks or kicks back when turning, alarm issues or wipers continue running after turning off. GM issued Service Bulletin 18-NA-161 for several models including the 2014 GMC Sierra that describes various problems that can be caused by a bad ground connection or loose battery terminals. The Chevy Silverado 1500 doesn't have this issue due to different headlight design.īad ground connection can cause various electrical issues: If you have a problem with headlights or any other electrical issues, some of the things that should be checked first are the ground connections and the battery terminals. If you are shopping for a used 2014-2015 GMC Sierra, check if the headlights are bright enough. ![]()
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