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Chevy Silverado and GMC Sierra Trailer and Towing Questions



  • barrailbarrail Posts: 27
    does your brake controller have diferent settings that allow gradual braking? I would start with that. could the brake drums on the trailer be warped?
  • Barrail - Thanks for the reply - the brake controller is a built-in system by Chevy - it allows for adjustments in half increments - 1.0, 1.5, 2.0, and so on. Unlike the Prodigy unit on my former truck, this system doesn't have a 'boost' option. As far as the drums/rotors are concerned, that had crossed my mind, but I haven't checked these yet. Would this be the kind of thing that wouldn't be noticed unless I was trailering a heavy load?
  • Hi Doonster i assume you are talking about when attatched with your air.? I just purchased a brand new 2011 dually have two compressors feeding one tank and when tapping the brake pedal can dump two thirds of my air. it just caused me a major incident that shunted my 43 ft trailer and locked it up coz of insufficient air. They first thought the bleeder valve got it home without towing and has not fixed the problem. Have you found a solution ?
  • Hello doonster,

    I can ask our technical assistance center this information if you like. On my end, I need to provide the last 8 digits of a vehicle's VIN when I do this. If you're willing to provide that information, please email it to me at the address listed in my profile.

    GM Customer Service
  • Problem fixed. With two compressors supplying
    air to tank u need a priority valve otherwise
    the float lever will flick from one valve to other
    and dump air I used a protek valve. As well the air hose
    must be atleast 2 metres curled up between them.
    Works like a charm .
  • What was your solution? I have the exact same problem.
  • my problem was no trailer brake lights,and maybe a turn signal was out. After exhausting my limited abilitys, I took it to my local mechanic and his son dropped what he was doing to look up the wiring schematics on some web site he subscribed to. the fuses were all good, and everything on the truck worked. the problem was only on the trailer harness. sorry for the long explaination, but the resolve was an faulty relay on the back of the fuse box under the dash, easily accessable by pulling of the dash board. hope this helps.
  • To jhayes:

    Sorry it has taken me so long to respond - To be honest with you, I have no clue regarding your response to my trailering problem (that's not your fault - it's mine). When you mention the air boost system in your 2011, compressors, etc. I am totally in the dark - Does my 2008 even have a system like this? How would I know? Please advise - I am a Dope. Sincerely, Doonster.
  • I have a 2003 2500 6L. I have noticed that while pulling my boat in trailer mode it does not seem to downshift correctly. When going uphill it stays in the high gear and I lose about 10mph. If I take my foot off the accelerator and then back on again it will downshift but otherwise will not.

    Any ideas? I use the towing mode and the light comes on the dash to show that OD is disabled.
  • mdetrevillemdetreville Posts: 2
    edited April 2012
    This question is for gmcustsvc:

    My 1998 GMC Sierra's VIN is 2GTEC19MXW152296456. From that can you tell me what the rear axle ratio is, and/or what the towing capacity of my truck should be? Thanks...
  • Never mind... it's in the glovebox..
  • gmcustsvcsarahgmcustsvcsarah Posts: 1,964
    Glad you found it, mdetreville. I did pull your VIN up in our systems here, though, and see that you have an open safety recall on your vehicle (pertains to the electrical outside rear view mirror switch). I just wanted to make sure you knew it was there, and if we can help you get an appointment set up to take are of that, let us know via email (

    All the best,
    GM Customer Service
  • steverstever YooperlandPosts: 39,971
    A reporter would like to speak to someone who recently bought a used large truck or large SUV. If you have purchased a used large truck or SUV in the past 6 months, and you are willing to discuss your decision with a reporter, please email no later than 1 p.m. Pacific/ 4 p.m. Eastern Wednesday, April 18, 2012 with your daytime contact information.

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