Question about 1999 GMC Sonoma

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4 wheel drive will not go in high but will go in low

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  • mecincle Dec 17, 2008

    gmc sonoma extended cab 4x4 6cyl. will operate in 2wd and 4low, but when attempting to shift on fly from 2hi to 4hi, nothing happens. When stopping and putting in neutral, pressing 4lo button, both 4lo and 4hi flash momentarily then 4lo light stays on. Still stopped and in neutral, when pressing 4hi (from 4lo), 2 and 4hi lights flash momentarily and then 2hi light shows (not 4hi). Doesn't seem to be a way to get into 4hi. how to fix and estimated costs for parts & labor, and comments on level of difficulty for amateur mechanic (has rebuilt engine before--except for machining)

  • bobandlorrie Feb 23, 2009

    I have the same problem and I tried pulling the 4x4 and courtesy fuses but it still won't engage. Is the 4x4 and ATC fuse the same?

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This worked for me on my 2003 Sonoma. Thanks alot Mike!

Posted on Dec 24, 2008

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Try to reset the 4x4 computer. Pull both the ATC fuse and the courtesy lamp fuse for at least one minute then reinstall both fuses. Cycle the key on and off five times. Please rate.

Posted on Dec 12, 2008

3 Suggested Answers

  • 99 Answers

SOURCE: 4 wheel low works but 4 wheel high does not.

sounds like the encoder on the side of the trans on the drivers side

Posted on Nov 30, 2008

  • 62 Answers

SOURCE: 4 wheel drive on my jimmy won't engage

try disconecting the battery to reset service light may not solve the problem but should allow u to put truck into 4 wheel

Posted on Dec 20, 2008

  • 1 Answer

SOURCE: I have a 2003 Yukon

My 2003 yukon xl does the exact same thing. Sorry that I do not have a solution, but I figure its the same reason the daytime running lights always burn-out. The SUV in general has be an absolute POS and I will never buy another.

Posted on Nov 11, 2009

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4 wheel low works but 4 wheel high does not.


sounds like the encoder on the side of the trans on the drivers side

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