35 answers to this question
New to the forum and need some help! I purchased a 2019 Silverado LT 5.3l 4x4 (new body style) about two months ago. I recently put on some bigger tires, rims and a 2" RC leveling kit. Shortly after installation, the engine light came on and the truck would not sift out of Auto to 2wd or 4hi. I'm also feeling some wonkiness in the back tires and transfer case...feels like it is stuck in 4hi on dry pavement. I had the codes pulled and something is causing a P189A and P1899 (transmission) errors to trigger. I did some research and found the issues could be a result of a speedometer calibration issue caused by the bigger tires. I was told a speedometer calibration unit should resolve the issue. I purchased an inline speedometer calibration unit from Hypertech, set the parameters and installed it. Unfortunately, the problem is still occurring. Any suggestions from anyone? Has anyone else experienced this? Thanks in advance for the help!
By Chuck B.
Anyone know what this noise is? It's very intermittent. Seems to do it most often between 40 and 50 MPH cruising with maybe a slight up hill. Never does it on coast or heavy acceleration. Very hard to tell where it's coming from.
2014 Sierra Denali 1500
Crewcab, 5'8" bed
3.42 axle ratio
about 118,000 miles
Hello T1XX owners,
Did anyone put a dipstick in there 8L90e transmission yet? I would like to get a dipstick but am not excited about spending $180 and putting three holes in my new truck.
B&M makes one that works but $180 seems like a lot(also three holes). Has anyone taken one from a Camaro and put it in? They have the same trans but different motor. so it might fit the trans but the bolt location might be different.
My question again is, has anyone did it yet? What did you buy? How do you like it?
I’ve got a issue that just started last night. I was driving home, pulled from a red light and engine revved pretty hard before shifting. That repeated all the way home. Every time I slowed down to 1st gear and had to start again it would repeat. When it did shift I didn’t feel any other gears change, just the one change. Part of this trip was on the interstate and at 65 MPH the RPM was about 2500. Trying to figure out if I have a speed sensor problem of some type issue not telling it when to shift or if I’ve got an actual tranny problem. I have very little mechanical knowledge and it’s my first GM vehicle I’ve ever owned for about 3 mos now. Also I did figure out when the RPM gets to right at where it should shift, I can let off and tap the gas and it’ll shift much sooner and smoother than if I just stayed in the gas. Also noticed the oil pressure increased when pressing the gas from about 40 to 60. Don’t know if this is normal but I’d never noticed it before. Maybe only noticed it due to being particularly observant cause I was having issue.
Also, separate questions, I got a check engine light a few weeks ago saying something about both main banks. Shop said it’s most likely vacuum leak somewhere. Previous owner is very knowledgeable and said to change O2 sensors and probably was not a vacuum leak. Any advice on this as well?
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