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03-21-2008, 08:43 PM
| #1 |
| Senior Member  Join Date: Jan 2007 Location: grand junction colorado
Posts: 73
 | 04 chevy avalanche 4x4 problem ive been trying to figure out whats wrong with my moms truck the service 4 wheel drive light comes on when shes driveing it everyone in a while but only stays on for a few mins and also sometimes when she backs up you here this loud noise that sounds like thunk but goes away within a few miles and also can you connect like a scan tool to the truck to see why the service 4x4 light is on |
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03-22-2008, 12:06 PM
| #2 |
| Senior Member Join Date: Dec 2007
Posts: 250
| I knew of a guy a few years ago with a very similar problem in a Ford explorer. I was caused by the "automatic" four wheel drive staying in 4x4 on dry roads. The thump when reversing was the four wheel drive disengaging. You should be able to read error codes with a scanner like a Tech-1. Some auto stores ( I think Autozone ) will read codes for free.l |
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03-22-2008, 01:42 PM
| #3 |
| Senior Member  Join Date: Mar 2007 Location: Currently, I live in Lancaster county, Pennsylvania.
Posts: 3,039
 | Most of your large chain auto stores, Auto Zone, Advance Auto, CarQuest, NAPA and such will read it for free. However, their equipment is usually limited to just the ECU and not even all models, kind of dumb if you ask me. That truck has a push button shift for the 4wd right? Is the light indicating it is IN 4wd all the time? Or just periodically by itself? Another thing I have learned recently is that the fully automatic actuators sometimes take several miles to disengage fully. and can cause vibrations and such until it does. When was the last time she legitimately used the 4wd?
__________________ Parts have been found, tools are collecting, tensions are rising, the weather is changing...look out.... the SAS is comming!  |
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03-22-2008, 04:00 PM
| #4 |
| Senior Member  Join Date: Jun 2005
Posts: 2,329
| a buddy of mine has a silverado that was doing this, i believe the problem turned out to be the automatic 4wd servo or whatever it is that is supposed to make it kick into 4wd. basically its going off by itself and needs replacing. i think thats you're problem, but no promisses
__________________ 99 suburban xlt 96 silverado 91 wrangler (my baby  )08 Honday shadow 750 (my mistress  ) |
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03-22-2008, 08:16 PM
| #5 |
| Senior Member Join Date: Jan 2007 Location: grand junction colorado
Posts: 73
| yes it does have the auto 4x4 she only used it once a few months ago and it says its in 2wd |
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