Question about 2003 GMC Envoy

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Liftgate hydraulics stopped working 2003 GMC Envoy SLT

Service Engine Soon came on yesterday morning. Heard about gas cap issue and tightened cap. Stayed on. I had an appt this morning and opened my liftgate to get stuff out. Came out of my appt, started my Envoy, and the Service Engine Soon had turned off. Got to the grocery store and the liftgate hydraulics won't work. Is it all electrical?

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  • bobbi3 Jul 19, 2008

    I had checked the fuses under the back seat and replaced the one for Liftgate Module 2. I am just now seeing that there is a Liftgate Module/Driver Seat Module. I'll go look at that. Any other fuses I should look at or do I have to take them all out? I replaced the one as it looked like it might be broken on the side but not sure and if it was bad, that would cover both situations. It did not help.

  • bobbi3 Jul 19, 2008

    There is an electric motor? All I see are two hydraulics - and I have to lift it. The hydraulics just help - and they are not doing that any more. The window part of the liftgate - the hydraulics are fine. Of course, the window and the bigger overall hatch are two separate hydraulics. Am I missing something? Everything else is working fine. And I think all the tail lights are fine...I will check that out. I know the top light is ok in the back window. The electronic lock works, the wiper - the washers never have worked but have never looked at that for the rear window as I didn't care. Anything else I can look at? My ambient temp sensor stopped working about 2 months ago. I guess with 158,800 she is entitled to start having a couple of problems.

  • bobbi3 Jul 19, 2008

    Thank you. So it was just a coincidence that the Service Engine Soon went off and the hydraulics went out. Full moon stuff I guess.

  • Anonymous Mar 15, 2014

    i have an 03 gmc envoy slt. the"service engine soon" light stays on, car stalls frequently.

  • Anonymous Mar 17, 2014

    Liftgate on 2007 gmc envoy does not lock?

  • Anonymous Mar 17, 2014

    Liftgate on 2007 gmc envoy does not lock?

  • Anonymous Mar 20, 2014

    my truck has had the service engine light on for a while but today it started flashing wile driving it?
    what can the problem be?

  • Anonymous Mar 26, 2014

    service engine soon light came on

  • Anonymous Mar 26, 2014

    the hydraulic lifegate is hard to open and won't stay open, is this something i can fix?

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  • 2,028 Answers

Yes this is electrical. Start by checking the fuses.

Posted on Jul 19, 2008

  • 3 more comments 
  • Ryan Rogers
    Ryan Rogers Jul 19, 2008

    It could be that the electric motor on the gate has froze up.

  • Ryan Rogers
    Ryan Rogers Jul 19, 2008

    This is a common occurrence with GMC. I have a Cadillac with the same motor for the automatic trunk. This little motor has froze and burned up twice in the last four years.

  • Ryan Rogers
    Ryan Rogers Jul 19, 2008

    O.k. I thought this was the model with the electric liftgate that you can open and close with the remote. These hydraulics are manual, eventually they wear out. You can get replacements at any autoparts store for around $30. Sorry for the misunderstanding, just replace them and you'll be good.

  • Ryan Rogers
    Ryan Rogers Jul 19, 2008

    There may be a sensor for the hydraulics, but I doubt it, they usually don't put a sensor with the manual hydraulics. Anymore there is so many little things that can cause the engine light to go off. You might take it to an Autozone if you have one in your area. I know that they will do a code check on your vehicle at no charge.

  • Ryan Rogers
    Ryan Rogers Jul 19, 2008

    Oh, you're welcome.

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