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Chevy Silverado and GMC Sierra Electrical and Computer Questions



  • 340mopar340mopar Posts: 1
    I came across your article on Edmunds and am curious about your fuel regulator. When running my AC in my 98 Silverado, NOT ALWAYS, the engine will begin to surge and act like it is running out of fuel. The engine then dies, and will not restart until the engine cools completely down, then it is ok, until the next time, Was this what your vehicle was doing? Would appreciate any help.

  • Hi oregonmarine. My 2001 GMC Sierra is having similar problems. My Automatic transmission will not shift unless you do it manually and I have no power to the tach, speedometer and my transmission indicator on the dash (PRND321) will not lite up. The gas gauge and the temp gauge also does not work. Then the next day, everything works perfectly. Then it goes back to not working again. Then back to working perfectly. Did you ever find out what is causing these issues? Please, Can anyone help?
  • pat110pat110 Posts: 1
    edited April 2010
    I purchased this truck over a year ago and have had significant problems with GMC's PASSCODE system, but have seemed to work those issues out. Now the when you shut down the truck and return to start it cold, no electrical power -no lights, no gauges, no interior lights, nothing. Here's the interesting part, if you hook-up jumper cables, (no need to jump the vehicle or even involve another car), the whole electrical systems springs back to life and the truck starts normally and runs fine only to have to do it again to start it next time. I've read a number of the previous posts, but I know my battery is good (tested, new), there is no abnormal power draw from the starter, my repair manual is hinting to the ignition switch, but am asking for any advice. Thanks
  • denhamdenham Posts: 76
    Have you checked your battery cable ends? From what I read this may well be your problem were the wires go in the cable end.
  • chevyk9chevyk9 Posts: 3
    I have a 09 chevy silverado. the cluster lights on the insturment panel stay on all the time while the truck is running. is this normal or something that i need to look into getting fixed? i thought the lights are suppose to be on only when the truck lights or on at night but they are on all the time. can some help???
  • paul707paul707 Posts: 1
    can anyone please tell me how to replace this thing!
  • gmcustsvcgmcustsvc Posts: 4,001
    I am from GM Customer Service. If you have automatic lights the instrument cluster will stay on. If you turn the lights off the instrument cluster lights will go off. Thank you,
    Mariah GM Customer Service
  • yosh1995yosh1995 Posts: 2
    UPDATE: For anyone that is having the issue described above with the turn signals and cruise control here is an update on my 2006 2500HD. I took it to the dealer and they fixed the issue by replacing the "multi-function switch on the column"....they replaced the turn signal switch. Costs was $348.00 for the diagnosis, parts, and labor to fix it. Not too bad. Sometimes its better to just take it to the dealer rather than wasting hours and and money replacing the wrong parts to track down an electrical issue!
  • akjbmwakjbmw Posts: 231
    In addition to what "gmcustsvc" said about the automatic lights staying on, you may notice that the dash lights will change brightness dependant on the light sensor at the center forward area of the dash. Mine works fine as long as I don't cover the sensor and cause a low light condition that makes the dash lights stay bright.
  • chevyk9chevyk9 Posts: 3
    In response to GM cusserv. I have turned off the lights to the vehicle and the cluster instrument lights still stay on. The sensor at the center area of the dash is never covered. This is driving me crazy.
  • gmcustsvcgmcustsvc Posts: 4,001
    Hello ChevyK9,
    I am going to research the lights to see if the vehicle is operating as designed. I will get back with you shortly to let you know what I have found. Thank you,
    Mariah GM Customer Service
  • steve302steve302 Posts: 1
    truck runs and starts great. runs good for 1st 20 mins of day. then radio goes off and on, wipers are slow and turn signals interfere with radio also engine hesitates and stalls. all things seem to be related. no one can solve my problem and the stalling is getting worse. after it stalls it does start up but as soon as its in drive it may stall again, any ideas appreciated
  • chevyk9chevyk9 Posts: 3
    Okay. I will wait to see what you say. Thanks
  • mrmremrmre Posts: 1
    had a local shop change out the distributor cap, and double check the computer for timing issues. The only codes that show is an oxygen sensor and 2 codes for the EGR valve.

    Since replacing the distributor cap and fixing timing issues the truck runs smooth and accelerates fine; however, after some extended driving, especially driving over 40 up to 50mph, the truck will accelerate by itself.

    The acceleration and changing of gears are smooth. The engine does not lag or feel like it misses a beat. After some time this issue goes away, but upon placing the truck in park the RPMs will shoot to 3000.

    My shop has disconnected the EGR valve(for a trail run) and asked if I notice the acceleration issue come back. Well it has, but this time it goes away rather than staying.

    Any advice or insight is appreciated.
  • obyoneobyone Posts: 8,065
    Have your throttle position sensor and idle air controller checked out.
  • whatsup3whatsup3 Posts: 2
    I have a 2001 Silverado 1500 5.3 L. Instrument panel lights are going crazy. Some times all the guages work and somtimes none of them work. Checked all fuses nothing blown. Anybody have any ideas on what's going on with these guages? Any ideas would be appreciated. :mad:
  • obyoneobyone Posts: 8,065
    GM had a bunch of defective clusters and had a limited recall on them. I'd try and check with a dealer if yours was covered under it.
  • whatsup3whatsup3 Posts: 2
    Thanks obyone,I will check with a Gm dealer about a recall.
  • bigmick11bigmick11 Posts: 1
    Does anyone know where the lighting control module is on a 2003 GMC Sierra?
  • I had to replace the whole gaslines on our 2003, due to rot!!!! Please have yours checked, as you could be losing gas or even be flammable!!!!
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