I bought a Certified Pre-Owned 2010 Sierra SLE 5.3L (LC9) Vin code "3" about 3 years ago. It's stock besides a front leveling spacer on the strut, no aftermarket electrical.
The truck will intermittently go into limp mode with "Service Stabilitrak & Service Traction Control" displayed on the DIC (No SES Light).
Eventually when the CAN bus reboots the SES light illuminates. After clearing the codes it drives normal until it happens again.
I've had it happen on the freeway, in park, on normal surface roads, over bumps, doesn't seem to be a reason why or when it occurs other than outside temps.
The odd thing is it only acts up when its warmer than 60 Degrees outside, this winter she drove fine without a single hiccup. Which tells me it
might be an internal module failure...
However, I've had it happen in the same spot on the way to work several times.
When I pull the DTC's it's from modules that lost communication on the high speed CAN/LAN buss or modules requesting MIL because of no ability to communicate.
U0073 - Communication Bus A OFF
U0100 - Lost Comm with ECM
U0101 - Lost Comm with TCM
P0700 - TCM Request MIL
P069E - Fuel Pump Control Module Request MIL
U0140 - Lost Comm with BCM
U0121 - Lost Comm with EBCM
U0102 - Lost Comm with Transfer Case Cntrl Module
- I've replaced the battery (Optima Red Top), cleaned the terminals and cleaned Mega Fuse. Tested Alternator with a Midtronics GR8
- Cleaned the Grounds on the Front Engine Block, Fire Wall, Chassis under drivers door, front frame by radiator. (Hood to Firewall ground strap missing)
- Removed the UBEC fuse block and swapped relays, no corrosion, applied dielectric grease.
- Removed the TPA lock on the TCM/ Trans connector, checked for backed out terminals or ATF leaking. Found nothing abnormal.
- Checked the Harness from the TCM going up to the Engine Block, nothing abnormal.
- Checked EBCM connectors & harness, nothing abnormal
- Checked FPCM connectors & harness, nothing abnormal
- Replaced 120 Ohm Terminating Resistor (Twice)
- Checked ECM connectors & harness, nothing abnormal
- Checked BCM Connectors, nothing abnormal
- Checked harness on top of engine, nothing
- Using a DLC Break-out box, I have 60 ohms on PIN 14 (CAN High), but haven't been able to test when it acts up.
- I can talk to most modules with my scan tool when the CAN bus is online, if I plug it in just after the bus went down, I cant communicate and have to wait until the bus
reboots to clear the codes and get back on the road. I used to be able to clear the codes "on the fly" while driving but it seems like its taking the bus longer to reboot
as time goes on.
Just ordered new Positive and Negative battery cables, and the Hood ground (not sure why the hood needs a ground)
Could the VCIM module be bad?
The truck is pretty much babied since I've had it, I change the oil myself every 2-3k (fear of AFM issues).
Any help is much appreciated. I'm running out of ideas.
OK so I've searched like crazy and find similar issues but never the exact same or a fix so here we go I have a 2006 chevy Silverado with rear drum brakes I have baer eradi speed front brakes basically it's just a larger bracket and rotor with stock caliper and also the truck is lowered with Springs and spindle in the front .I noticed my brakes squeaking the other day so I checked the brakes and noticed the drivers pads were almost completely gone where the passengers look new and now that I'm really paying attention I notice that the truck pulls to the left when hard braking ..the temperatures are much hotter on the driver side and more brakedust I thought for sure it would be the after market calipers or lines so I went out and got brand new OEM calipers and lines and bled.. it the 1st couple stops it seemed OK and then I gave it a hard stop and the AbS did its thing and now it's back to the way it was I'm not sure if it was the ABS that did it or just the fact that it was a hard stop and I warmed up the brakes..but back to square one wondering if its the brake pressure modulator valve idk need help
I just replaced the front bearings on both sides of my 99' Silverado Z71. But now the brakes are giving me issues. When im going slow is where i have the issues. It feels as if they lock up and all you hear is kinda like a bad power steering noise. the pads are almost new. I dont know what this could be. Can anyone help.
I am currently replacing the entire brake system on my 1995 GMC Safari SLX 2WD after my brakes failing after a brake fluid flush/change in which I found motor oil or something of the sort in the master cylinder, My only problem is finding a new ABS Unit, Kelsey Hayes RWD Antilock brake system. I was just wondering if i can fit an ABS from a newer vehicle or another vehicle from similar years because it is ridiculous trying to locate the same one. I know the GMC astro and GMC safari vans between the years 1988-1995 have the same unit but surely another unit will still do the same job without any problems.
Also is it actually necessary to replace the ABS unit because of oil damage to rubber components because im not sure on if oil will contaminate the ABS.
Any help would be much appreciated !
I just purchased a 2013 2500hd with the 6.0 from a dealership last week with 84k miles on it.
Tonight I started it and the service traction control light came on with the message on the info center. That's weird but then the doors started locking and unlocking themselves, the gauges kept going on and off, the engine would surge under any throttle so bad I couldn't drive faster than 55mph and the CEL came on.
I took a video of what it is doing.
The engine codes I got were pending and they are
Has anyone dealt with anything like this before?
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