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Chevy Silverado and GMC Sierra Electrical and Computer Issues

348 messages,  Last post on Nov 06, 2009 at 10:33 PM

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What is this discussion about? Chevrolet Silverado 1500, Chevrolet Silverado 2500, Chevrolet Silverado 3500, GMC Sierra 1500, GMC Sierra 2500, GMC Sierra 3500, Truck

#314 of 348 Re: chevy silverado 2500 1989 [johnny_t] by canayjun64 Jun 04, 2009 (3:17 am)
Replying to: johnny_t (Jun 03, 2009 4:25 pm) johnny_t.... did you tray a Haynes manual? Thet are quite good. Try this link.   http://www.haynes.com/products/year/1989/make/Chevrolet/model/Pick-Up/productID/- - 246   I've been using them fo all of my vehicle I owned and they are very helpful.
#315 of 348 Turn Signal/Back up Light 2007 Silverado by bob2007chevy Jul 28, 2009 (2:52 pm)
I have a new body style 2007 Silverado, quad cab. When I use my left blinker, my blinker and my back up light both blink. After a few moments, the blinker blinks very fast. I changed the bulbs. I have over the 35,000 miles on the truck. Any suggestions? Replies to this message: obyone (Jul 28, 2009 3:13 pm) seabeemax (Jul 28, 2009 6:24 pm) ffkc120 (Aug 17, 2009 3:09 pm)
#316 of 348 Re: Turn Signal/Back up Light 2007 Silverado [bob2007chevy] by obyone Jul 28, 2009 (3:13 pm)
Replying to: bob2007chevy (Jul 28, 2009 2:52 pm) Take it back to the dealer before your factory warranty is up. Replies to this message: seabeemax (Jul 28, 2009 6:24 pm)
#317 of 348 Re: Turn Signal/Back up Light 2007 Silverado [obyone] by seabeemax Jul 28, 2009 (6:24 pm)
Replying to: obyone (Jul 28, 2009 3:13 pm) Have you changed any wires on the pig tail
#318 of 348 2k Sierra / alarm keeps going off by whatnxt Jul 29, 2009 (5:43 pm)
The alarm in my 2000 Sierra went off and I couldn't stop it no matter what I did. I used the remote and the key to no avail since this would only stop it for a few minutes to a few hours, then it would go off again and the only way to stop the noise was to disconnect the battery. I tried for a couple of weeks to figure it out myself but was not able to resolve anything. This was in mid June   I finally took it to an alarm specialist and they checked the truck out from top to bottom and concluded that the problem was not with the aftermarket alarm the dealer had installed but with the factory alarm that came with the truck. I did not know they were separate but still functioned with the one remote. He showed me by changing the sound in the aftermarket alarm, then triggered the alarm in different ways to activate first one then the other. This was possible because the factory alarm doesn't have motion sensors, but is activated by the opening of the doors and such. By doing this I was able to distinguish the two alarms going off by their different sounds, with the factory alarm sounding the horn while the aftermarket sound was a siren. They did all this so that I could take the truck home and the next time the alarm went off I would know which one had gone off by the sound, i.e. the horn or siren. That night the alarm went off and just as he said, it was the factory alarm since the horn sounded and lights flashed. I disconnected the battery and next day called the alarm place. He said they would not be able to help me since they only worked on aftermarket alarms because the factory alarms are tied into the BCM which he thought needed to be reprogrammed in order to fix the problem. He said it was a computer problem not a physical problem (as in wiring) and for this I needed to take it to the dealer.   The following week I took the truck to the dealer and explained everything that had occurred and the information from the alarm specialist. Dealer had never heard of this problem. He said they would look into it and call me when they had any information. Next day I got a call and was told that they needed it for one or two more days. Two days later I was called and told that all physical components were okay, and that the problem was with the BCM. BCM was replaced, I took the truck home, and unfortunately, the alarm just went off last night again. Will be contacting the dealer again.   This is also an answer to post #30, #221, and #260. I will keep you informed as I find out additional information. If anybody can help, please answer. Thanks. Replies to this message: obyone (Jul 31, 2009 8:22 am) whatnxt (Jul 31, 2009 5:39 pm) obyone (Aug 01, 2009 4:02 pm)
#319 of 348 Re: 2k Sierra / alarm keeps going off [whatnxt] by obyone Jul 31, 2009 (8:22 am)
Replying to: whatnxt (Jul 29, 2009 5:43 pm) I took the truck home, and unfortunately, the alarm just went off last night again.   Which alarm?   When did you install the aftermarket alarm?   Which remote are you using?   If I'm not mistaken, the aftermarket alarm also ties into the BCM. Replies to this message: whatnxt (Jul 31, 2009 5:39 pm) obyone (Aug 01, 2009 4:02 pm)
#320 of 348 Re: 2k Sierra / alarm keeps going off [obyone] by whatnxt Jul 31, 2009 (5:39 pm)
Replying to: obyone (Jul 31, 2009 8:22 am) The factory alarm is the one that keeps going off, and the aftermarket alarm was installed when I bought the truck. I am the original owner. They are both intergrated into the remotes. The way I understand it, both are programmed to the remotes you get when you buy the truck but are still two separate alarms that can function as one. I was told by both people that worked on it that the main alarm will always be the factory one and that only the dealerships can work on them because of the programming issue, since it's tied into the BCM. Aftermarket companies do not and will not touch the BCM. This also means that if you ever need a new remote you have to get it from the dealer because it has to be programmed to that vehicle via the BCM. This leaves me and anyone else with this kind of problem at the mercy of the dealers. That is unless someone out there can help with new info. Thanks for the response. Replies to this message: obyone (Aug 01, 2009 4:02 pm)
#321 of 348 Re: 2k Sierra / alarm keeps going off [whatnxt] by obyone Aug 01, 2009 (4:02 pm)
Replying to: whatnxt (Jul 31, 2009 5:39 pm) The dealer installed the aftermarket alarm when you originally bought the truck?   Sounds like something is shorting to ground as in bad wiring.
#322 of 348 Re: Turn Signal/Back up Light 2007 Silverado [bob2007chevy] by ffkc120 Aug 17, 2009 (3:09 pm)
Replying to: bob2007chevy (Jul 28, 2009 2:52 pm) I have had many similar problems. I have a 2006 GMC sierra 1500 4x4.. and my brake lights will burn out almost every other month, along with the parking amber lights. Just the other day i was headed to work and pushed in the cigg. lighter and smoke started rolling out from under my dash. I had to pull over and let the smoke clear out. I could smell burnt rubber. then the next day, I stopped at the gas station and turned the truck off, and it wouldnt even turn off. then it said service 4x4 system, which had never been used. I drove home unhooked the battery to turn it off, still wouldnt turn off, then i unplugged fuses untill it would turn off. I took it to the dealership and talked to gmc customer service .. it now needs 1400$ worth of parts and new wiring harness. gmc tells me they cant assist in payment because there was no mechanical defect?? im not to sure how it was my fault at all, and how it wasnt a defect. hopefully this doesnt happen to your truck, i know i won;t buy another one.
#323 of 348 06 chev 250 4x4 v8-engine power reduced by grampa2 Aug 19, 2009 (4:23 pm)
truck only goes 40 km/h- light on dash says engine power reduced-truck is in great shape-what could be the problem-never heard ot this type of waring light????

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