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Please Help! 14 DTCs. Air Bag, EVAP, EBCM, dash lights, dimmer pro
Fairly new to posting here, so please let me know if this question would do better in another spot. I have a 2017 Sierra 1500 SLT. About 2 years ago when it was hot out,I started my truck, and the dash started flashing through all of the warning signs(seat belt, air pressure, pretty much every warning). None of my gauges worked on the dash, but my infotainment system worked, and my lights, including blinkers, on the outside worked. After running it for about ten minutes, it like reset itself and the dash started working. It was under warranty at the time, but only happened once. Now, my truck is no longer under warranty, and it happens every single time it's hot outside. The dealership said they'd have to keep my truck for awhile to let it mimic the issue, and I know they will charge me out the ass just to find the problem, before asking for a couple grand to fix it. Considering it only happens when it's hot, I feel like something is expanding and making a connection issue. Has anyone had any experience or heard of this? I would greatly appreciate any advice on what to look for it how to test the issue. I did use a tester while it was doing it last time, but no codes came up. I'm really confused.
By Ed Ewing
I have had a problem passing emissions in IL. I have a cheap obd2 scanner and was having trouble clearing the p0442 code only to find out it is a permanent trouble code. I ran a smoke test and repaired the leaking EVap fitting. I then drove for weeks waiting for the evap readiness monitor to OK and it has just completed. However, I still see the code p0442 stored. All monitors are complete and there is no engine light on. I had expected the code to clear after I made the repair and the evap readiness completed. I need to get it back to test emissions so that I can pass and re register my vehicle. Do the permanent codes clear on their own? If so, how long does it take seeing that all monitors are complete and no light is on.
***I am not a professional mechanic but try to do my own repairs.
By Corr HexEditor
We are developing a new software program that focuses on removing DTCs from vehicles. Our support list is very broad and includes trucks as well. I would like to know if you would be interested in such a program? Or you may know people who need it. Let me know.
I purchased a 2021 Silverado Crew Cab High Country 4WD about 4 months ago from Watson Chevrolet in Tucson Arizona. Within week of driving the truck I began noticing some pretty strange sporadic things happening. I started video taping the issues when I could to document what was happening. Ticking noise coming from the engine when cold starting, sporadically have hourglass on stereo saying “loading” it would continue until the engine was turned off and back on then it was OK. “Park Assist” Error message sporadically popping up while driving down the road, Horn honking (three short honks) for no reason while sitting in traffic at a red light. At 900 miles I reached out to the dealer and told them these concerns and issues I was experiencing. The service manager explain to me “the truck has a lot of technology and it just needs to learn your driving habits, you just need to keep driving it”
At 11,000 and 3 months after purchasing I get the loud lifter noise, “Service parking brake”message, “steering assist reduced” message, “Service ESC light” and “check engine light” I drove it into the other dealership located in Tucson (O’Reilly Chevrolet), they keep the truck for about three weeks and “replace lifters on one bank and 1 bent push rod” and tell me that they couldn’t duplicate any of the other issues however they did a firmware upgrade and everything should be fine. One week after getting the truck back (11500 miles) I get another check engine light, Keep in mind I can still hear the lifters ticking when starting it first thing in the morning. I take back to the dealer after a week of a being in the shop, They tell me “The check engine light was because there was multiple cylinder misfire and it was the opposite bank from the lifters they replaced” however they can’t duplicate the problem so there’s nothing they can do. They admitted that the computer had logged over 200 misfires on one cylinder and that’s what made the check engine light turned on, then they go on to tell me they can’t duplicate the problem so there’s nothing they can do. I asked them about the ticking noise when starting and the tell me “that’s normal, it’s not lifter noise you’re hearing, it’s the new technology fuel pumps GM is using that’s making that noise”
Other issue I have had is the rotors on all four wheels at times will turn blue and discolored as if the brakes and her have been completely overheated. But it’s not the entire rotor It’s only the center inch of all rotors. The inside edge and outside edges look normal.
I have a purchased over 11 band new (Ford, Chevy, Dodge, Toyota) Trucks in the past 30 years this is by far the worst freaking vehicle I have ever purchased.
By Ryan Woodcock
Hi everyone. I have a 2000 Suburban I just bought a couple months ago. I got a couple of check engine codes I've been working through, but I'm stuck on these last three.
I have the following current codes: P0175 (System Too Rich Bank 2), P0420 (Catalyst System Efficiency Below Threshold Bank 1), and P0430 (Catalyst System Efficiency Below Threshold Bank 1).
I had codes for knock sensors as well, but got them replaced, and only these three codes remain.
I took temperatures at the exhaust ports on the manifolds on both sides. Bank 2 was significantly hotter than bank 1. By more than 100F-150F.
I took temperatures at the inlet and outlet of both cats. Sometimes the outlet was hotter, sometimes it wasn't. I have a cheap Walmart infrared so I take all temp readings with a grain of salt however. Outlet temps were within 100F of the inlets.
I also took readings of the o2 sensor voltages for upstream and downstream for both banks. The upstreams appeared fine but the downstreams were pretty inconsistent. Sometimes staying pretty flat near 0.03v, other times they'd spike. They did this regardless of being at idle, or revving the engine at 2000rpm in park.
I'm slightly confused at the information I gathered today, I'm trying to determine what road to go down. I'm good at working on things, not so much diagnosing. I plan on replacing both downstream o2 sensors with new ACDelco's to start, and that should tell me if the cats are bad if the codes come back, if my thinking is correct.
But I'm most confused about how one bank of cylinders could be running rich, but the other isn't? Shouldn't all fuel injectors be getting the same amount fuel, at the same pressure? Everything I've found online says if I have P0175, I should also have P0172.
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