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Chevy Silverado and GMC Sierra Electrical and Computer Questions



  • gmcustsvcgmcustsvc Posts: 4,057
    Hey bigman55434,

    You're still within your warranty. If this happens again or is a continued concern, have your dealership check into it.

    Amber N.
    GM Customer Care
  • lromjuelromjue Posts: 2
    Wshield washer stopped working. Pump motor runs but only makes loud SQUEELING noise. No water to Wshield. I guess the motor should be replaced.

    How do I get this fix? Can I do it myself. NE trouble shooting to be done first.

    Thanks, larry
  • Thanks Amber. After owning several newer GMC trucks, I have come to expect occasional weird electrical or computer related issues. These trucks are so dependent on computers, that I swear they "lock up" once in a while and need to be "rebooted" by restarting the truck. Like the time I backed out of my driveway, put the truck in drive, and it went nowhere. No throttle, no forward, no reverse, nothing. I had to restart the truck and then operation was normal again. This was on my 2011 Sierra 1500. Can we go back to the days of no computers in vehicles?
  • gmcustsvcgmcustsvc Posts: 4,057

    That is very strange what happened to your '11 Sierra. Computers in vehicles however is "the world we live in". If you happen to have any other concerns or just need to run an issue by me, do not hesitate to do so.

    Amber N.
    GM Customer Care
  • Yes, I agree that computers are a necessity in the world we live in. I just wish that GM software engineers would spend a little more time debugging their software. It is a little disconcerting at times when you know you are driving a vehicle powered by the equivalent of Windows Vista.
  • shopdog97shopdog97 Posts: 151
    A good friend of mine has a 2003 Silverado with the 5.3 V-8 and the other morning his check engine light came on for what he says is the first time and he bought the truck new, only has a little over 60K on it now. I used my code scanner and found 2 codes set. One is PO446 for which the explanation given is "Evaporative Emission Control System Vent Control Circuit Malfunction", and the other is PO452- "Evaporative Emission Control System Pressure Sensor Low Input". Is there anyone who has had these codes come up? What was/is the solution? Where is the location of these components in question? He says the truck runs just fine in his opinion, where I feel a slightly rough running engine. He told me when I asked him if he ever had the truck tuned up and he said NO! Original plugs and wires still in there after 10 years? Anyway if anyone can make a suggestion on this issue, I'd deeply appreciate it. Thanks!!
  • denhamdenham Posts: 76
    The vent control valve may stick open or closed when the computer cycles
    when engine is started. This control valve is at the fuel tank rear of the fuel inlet, and a bit difficult getting at. I have had this problem and it is because of dirt, dust and age. I have removed and cleaned a number of these after the customer has done spent big bucks and the light come back on!
  • chzzzitchzzzit Posts: 2
    I have a 2011 GMC Sierra 3500HD and I am having trouble with the headlights. They won't come on. I changed the bulbs, fuse and the switch. My marker lights and high beams still work. My headlights do not. Any ideas?
  • I had a very similar problem with my 2001 gmc sierra 2500. First signs of a problem was intermittent stalling. After a long drive all the gauges went haywire a couple of times. To get home I had to constantly feed it gas with my right foot and brake with my left. Took some advice from this site that the problem was in the ignition switch and it was. I have a repair manual for my truck and changed it myself. Saving $400-$500 bucks. Remove the old switch and the attached wiring harnesses and bring them with you as you may have several types to choose from depending on the number of pins yours has. The number of pins is really the number of wires leading to the module that has to be unbolted to be removed. Definitely buy a repair manual with pictures. Had some problems getting it to turn over after reinstalling everything. There is a trick to installing lock cylinder(found on Autozone repair site). When reinstalling ignition switch into lock cylinder prep the cylinder by sticking screwdriver into cylinder hole(in side of column) and turn internal latch clockwise and let it snap back(like the key would when starting) then seat the new switch in place. This little tip took me two hours to figure out. The rest was fairly easy. disconnect negative cable at all times except when trying to turn over engine. hope this helps.
  • lt_dlt_d Posts: 1
    I have a 2000 Chevy Silverado Z-71 5.3 litre. I've been having an intermittent problem with the dash lights blinking and when this occurs then the truck won't idle without pressing the accelerator. When this first started it was only the 4wd indicator lights that would all light up and blink. The last time this happened the 4wd indicator lights were blinking, the park brake light blinked, the abs light light blinked etc.. , and about every five seconds I would hear a click and all the gauges would fall to zero and then another click and they would work again. This problem only occurs at start up and when it happens then the truck will not idle without pressing the accelerator, and eventually the truck won't start again even when pressing the accelerator. I can disconnect the battery and then reconnect and it clears the problem. It happens randomly and usually works fine for weeks before it happens again.

    I thought that it might be a bad ground. However, since I can disconnect/reconnect the battery and it clears out the problem, I'm thinking it may be a computer related problem. Has anyone else seen this problem or know what I should check? Thanks in advance for any suggestions.
  • Hey all you out there. What do you think about a Dealer putting in 12 Qt of oil in in your 2013 Silverado 5.3 with 5000 miles on it and you drive it almost 40 miles before you see all the smoke coming out the tail pipe. How much damage did it do to my motor.
  • I own an '07 Silverado and about once per week when I am starting from a complete stop the transmission stays in low gear and the speedometer stays on "0" (even though the truck is moving). I have to come to a complete stop, nothing else, then everything works fine for another week or two. You never know when this is going to happen, but it has been going on for months now. I left with a local Chevy dealer for a week and they drove it, checked everything, and could find nothing wrong. Of course, as soon as I picked the truck back up it happened again that same day. It has to be some sort of electrical problem, but no one can figure it out. Any suggestions or similar problems to guide me in the right direction?
  • Just bought a 2006 Silverado 4.8, 2wd 1500.

    All of a sudden Saturday night, all 4 little gauges quit, and the ABS, Seat belt, and Battery lights came on. The power windows and interior lights with the door open also quit at the same time.

    This morning I cleaned the ground on the frame under the driver door and on the front driver side under the head lights.

    Anything else I can check? Is it the Dash? Is it the BCM? Is it still a ground?

    I have mechanical skills, just need to know where to look!!

  • nschevdrivernschevdriver New Glasgow NSPosts: 1
    I recently encountered the problem with the truck going bonkers and all lights on the dash lighting up, door locks going on their own and vehicle down shifting, then won't start at all (as if battery dead). Dealer replaced trailer brake and fuel pump modules. That solved issue for a few hours and then same issue and had to get towed for the 2nd time. I had a mechanic clean all the grounding points on the frame and the cab mount and so far there hasn't been an issue. As mentioned in a previous post, the ground on the frame under the driver's door was in poor shape and needed cleaned and tightened up. Crossing my fingers so far so good!
  • king80king80 Posts: 1
    My 2001 GMC light is on code reader at Auto Zone says misfire on coil1,3,5,7 and cylinder misfire on 7 bit there are no actual misfires except on 7 about once a day when the engine is cold. Sometimes I can go weeks with no misfires on 7. What could be causing this?
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