4WD will not shift into 4Hi

10

Asked by May 11, 2016 at 03:24 PM about the 2002 GMC Sonoma SL Ext Cab 4WD

Question type: Maintenance & Repair

Will shift into 4Lo and then into 4Hi, but not directly to 4Hi.  Have disconnected battery cable for 5 min to reset TCCM - same symptoms.  Seems like if it were vacuum line issue, it would not shift to 4Lo???

1 Answer

10

Will attempt to clarify my issue and question: 2002 GMC Sonoma with 3-button shift on dash - 2Hi, 4Hi, 4Lo Was able to shift directly from 2Hi to 4Hi, but stopped working last year. It can still shift from 2Hi to 4Lo (while stopped and in neutral) Once in 4Lo it can then shift into 4Hi Also have to be stopped and in neutral to shift from 4Hi back to 2Lo, then from 2Lo to 2Hi. It has basically lost the ability to shift on the fly. My question - DOES THIS SOUND LIKE A KNOWN ISSUE WITH THE TCCM? Research shows the most common problems to be vacuum lines, vacuum actuator or TC vacuum switch (ball stuck). My logic is that if the problem was with the vacuum system - it would not shift to 4Lo (or anything) --- maybe this is not good logic? I hate to just start changing parts and hope I find it. I'm unemployed at the moment and can't afford to pour lots of money into this truck. Special thanks to ANYONE for helping me out with some advice or benefit of their experience.

1 of 1 people found this helpful.

Your Answer

GMC Sonoma Experts

  • #1
    parkle
    Reputation
    700
  • #2
    Mike Bonnell
    Reputation
    480
  • #3
    James Mayfield
    Reputation
    320
View All

Related Models For Sale

Used Chevrolet S-10
13 Great Deals out of 1,239 listings starting at $1,550
Used Ford Ranger
195 Great Deals out of 5,544 listings starting at $1,800
Used GMC Sierra 1500
1,153 Great Deals out of 64,213 listings starting at $999
Used Chevrolet Silverado 1500
2,570 Great Deals out of 173,272 listings starting at $1,000
Used Toyota Tacoma
653 Great Deals out of 45,099 listings starting at $2,500
Used Ford F-150
3,135 Great Deals out of 219,092 listings starting at $1,200
Used Dodge Dakota
87 Great Deals out of 3,637 listings starting at $1,295
Used Nissan Frontier
448 Great Deals out of 23,767 listings starting at $1,500
Used Dodge Ram 1500
435 Great Deals out of 11,068 listings starting at $2,000
Used Toyota Tundra
668 Great Deals out of 34,265 listings starting at $1,500
Used Ford Explorer Sport Trac
57 Great Deals out of 1,813 listings starting at $3,000
Used GMC Yukon
581 Great Deals out of 20,783 listings starting at $2,695
Used Jeep Grand Cherokee
1,026 Great Deals out of 71,591 listings starting at $1,195

Used Cars For Sale

2003 GMC Sonoma SL Ext Cab 4WD For Sale
6 listings starting at $4,357

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.