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Chevy Silverado and GMC Sierra Electrical and Computer Questions



  • canayjun64canayjun64 Posts: 34
    Thanks barnowl3... Humm I guess I'll have to see if a bulletin comes out indicating a contradiction to what they said. So far nothing out there for the 2009 models.

    Like you said, it helps to provide the info.

  • I have a 2003 Chevy 1500 with 148,300 miles (owned since new)....Has been a Great truck.....recently the message display will go from english to french to will get stuck on hours used or trip...sometimes the trip will reset will let me set it on english and it will stay sometimes... Anybody got a clue???????????? Thanks Roger
  • barnowl3barnowl3 Posts: 70
    Sounds like you need to have the gauge cluster replaced. The erratic gauges and speedo issues are part of the bulletin and lawsuit. If you get there before 70,000 miles they'll cover it. Between 70 and 80,000 miles, you only get the parts for free and may need to send the info in to get the credit. The lawsuit covers you from 70,000 to 80,000 miles.

    I have also had the radio cut out normally on my '03. The first time the dealer put in some kind of software update. It has happened 1 or 2x since then and just seems to correct itself.

    The other problems may be related to your gauge cluster, get that fixed first and before it is not covered.
  • kb52kb52 Posts: 1
    The a/c, heater electronic display flashes on and off and I have no control of the temperature. The display unit has been replaced once, with the same symptoms. The condensor coil was replaced and the system re-charged when the problem started. I understand the display had to be removed in order to have access underneath the dash. Any ideas on to how to repair this would be greatly appreciated by both me and my mechanic!!
    Thanks, Kenneth
  • canayjun64canayjun64 Posts: 34
    kb52...I had a similar issue with my 94 Concorde. It turned out to be a cold solder on the display control. By banging the display slightly, I was able to re-gain control of the temperature temporarily. It was a bit tricky to find but with the help of a magnifying glass, I was able to locate the problem and fix it.

    Who might be just that. Good luck!
  • johnny_tjohnny_t Posts: 1
    I have a old but well kept silverado from -89 it is a 6.2 diesel, and everything is working just smoothly. the "service car soon" lamp is lit, and i would like to know what the warning lamps indicates. therefore i am looking for a owners manual on the internet, but seem to find only for newer models. anybody know where to find this? i actually bought the heyes manual, but cannot locate it there,
  • canayjun64canayjun64 Posts: 34
    johnny_t.... did you tray a Haynes manual? Thet are quite good. Try this link. - 246

    I've been using them fo all of my vehicle I owned and they are very helpful.
  • 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?
  • obyoneobyone Posts: 8,054
    Take it back to the dealer before your factory warranty is up.
  • seabeemaxseabeemax Posts: 5
    Have you changed any wires on the pig tail :sick:
  • whatnxtwhatnxt Posts: 3
    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.
  • obyoneobyone Posts: 8,054
    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.
  • whatnxtwhatnxt Posts: 3
    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.
  • obyoneobyone Posts: 8,054
    The dealer installed the aftermarket alarm when you originally bought the truck?

    Sounds like something is shorting to ground as in bad wiring.
  • ffkc120ffkc120 Posts: 1
    :sick: 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.
  • grampa2grampa2 Posts: 5
    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????
  • himiehimie Posts: 4
    I have a 2003 2500 Sierra with factory alarm thatbis going off in the middle of the nigh. I was wondering if you ever came up with a solution to your problem.
  • grampa2grampa2 Posts: 5
    disconnedted battery for a few minutes, it must have reset.try e-mail the alarm company and ask them, they usually try to help???
  • idaho3idaho3 Posts: 1
    Anyone know how to turn the tire pressure monitor off. I have changed wheels and tires. I do not what to unmount the original wheels to get the tire pressure senders
  • himiehimie Posts: 4
    I disconnected my battery for about 10 hrs. After reconnecting it my factory alarm went off like it did previous times in the middle of the nite. Took about 1 hr after being reconnected before it went off again. Anybody know who to contact about a factory alarm. GMC dealers want $100 to check it out. Trying to save some money if it is something simple.
  • I have a 2004 SS and the left turn signal won't work sometimes. It won't light up any of the lights even the dash and is very sparatic. Won't ever do it when it's in the shop. I have already but in a new turn signal switch which changed nothing. Sometimes you can hear a really clicking really fast.
  • vhdvhd Posts: 2
    Does anyone know how to over ride the system so that the DVD player will play on the riding screen while the truck is in drive..
    Agin this is a very important question so i can watch football while my wife is driving!!

    Seirra Danali 2009
  • I have a 2003 GMC SIERRA PU. Security Alarm will go off anytime. I have tried to disconnect the battery and for a period of time, but still sounds off anytime. Has anybody had this problem and how did you fix it?
  • I have a 2001 chevrolet silverado 1500 and my lights just like yours comes on and stays on I personally have a relative that works at the dealer ship and he too put my truck on a dianostic machine and it gave two codes.The machanic said it was a computer module that went bad so I read your story and I wanted to share it with you....maybe it could be the same problem. Write back to me at Shane
  • I have the same problem, it is in your tilt steering column not the fuses or headlights, I have not broken it down yet to find the answer that is why I looked to here to see if anyone had similar problems, if you raise your tilt all the way up they should come on intermittently, I am not sure if it is a wire degraded from the strain of being bent back & forth or it has some type of contacts since the travel is extensive, but I have had to jar the steering column sometimes to get it to temporarily work, I hope this at least points you in the right direction, I will let you know if I find the permanent fix, is seems it is a common problem with that design & is used in numerous GM vehicles
  • My 2001 Chevy 2500 HD 6.0 liter is misfiring on #'s 2,4,6,8 cylinders and if I understood it correctly it is all on the passenger side. It just happened over night. It came up on the computer as being one of three things. Intake gasket, bad plugs or wires. Had the gasket replaced and drove it home about 7 miles and it ran fine. Sat for two days started it up and it was misfiring again with the service engine light flashing as before. I do have a bad catalytic converter that has been rattling for about 4 months, I don't know if that has any bearing on the problem or not. Thanks for any help.
  • While driving the truck last weekend my dash was reading "Right Door Ajar". My lights were also staying on. A couple times I couldn't get my inside lights to turn off after the alarm sounded until I disconnected my battery. So I took it into the dealership and told them what was going on. They said my switch in the right door was tested and said it was bad, It cost me $427 for parts and labor. It has been 5 days and the alarm has not sounded, and it was happening alot if I had the battery connected. Keeping my fingers crossed.
  • 2007 Siverado 1500HD battery dies when truck is not used for more than 3-4 days, I have had the dealer do many tests and no real answers, the battery has been changed out twice, the truck is optioned up pretty good, so there are a lot of draw functions on it, but the parasitic draws are not out of line according to the dealer, I would like to use a bigger better battery, but the space won't allow this....any one had this problem???, the truck is well maintained, and had about 21K on it
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