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 out of 1 people think this is helpful.

Your Answer

Add photo

Related Questions

  • 4x4 Problems 5 answers

    Driving in the snow the other day and I went to put it in 4x4 but it did not engage. Indicator lights were not lit on any selection as well (2hi, 4hi, 4lo). Pulled fuse to check for problems and didn'...

    1994 GMC Sonoma 2 Dr SLS 4WD Extended Cab SB

    -

    Maintenance & Repair

  • 4wd not working 3 answers

    Hi, My 4wd on my gmc sonoma 2000 hasn't been working since I bought it and I decided to try it out and fix it. I changed the actuator and the cable. As soon as I start the truck the actuator sucks ...

    2000 GMC Sonoma SLS Ext Cab Short Bed 4WD

    -

    Car Customization

  • 2002 Yukon sle won't go in 4hi, 11 answers

    I have changed the axle actuator, transfer case switch, 4wd switch on dash, 4wd fuse, atc fuse are good, Not sure what to do next

    2002 GMC Yukon SLE 4WD

    -

    Maintenance & Repair

  • Electronic 4x4 shift? 2 answers

    I have a 1997 Yukon with 225000KMS. I bought the truck with the 4x4 not working and i am trying to diagnose the problem so i can buy the right parts for it and take the right course of action. It...

    1997 GMC Yukon SLT 4WD

    -

    Maintenance & Repair

  • My 2005 GMC Sierra 1500 Hd has 4WD issues. I can change from 2wd to 4Low but I cannot slect and change into 4Hi.

    I cannot change to 4HI . I can change from 2Hi to 4Low and reverse. Also if I select Auto4WD, I cannot change out of it until I turn off the ignition and then turn it back on again.

    2005 GMC Sierra 1500 SLT 4WD Crew Cab SB

    -

    Maintenance & Repair

Search GMC Sonoma Questions

GMC Sonoma Experts

#1 parkle
parkle
Reputation 670
#2 Mike Bonnell
Mike Bonnell
Reputation 460
#3 James Mayfield
James Mayfield
Reputation 310
View All

Related Models For Sale

Used Chevrolet S-10
8 Great Deals out of 1,355 listings starting at $1,595
Used Ford Ranger
186 Great Deals out of 6,019 listings starting at $1,750
Used Ford F-150
2,253 Great Deals out of 209,704 listings starting at $1,499
Used Chevrolet Silverado 1500
1,750 Great Deals out of 170,133 listings starting at $1,800
Used GMC Sierra 1500
796 Great Deals out of 67,165 listings starting at $2,700
Used Toyota Tacoma
502 Great Deals out of 39,894 listings starting at $1,995
Used Dodge Dakota
114 Great Deals out of 3,883 listings starting at $1,000
Used Nissan Frontier
341 Great Deals out of 26,849 listings starting at $2,400
Used Dodge Ram 1500
448 Great Deals out of 11,375 listings starting at $700
Used Toyota Tundra
501 Great Deals out of 34,165 listings starting at $3,000
Used GMC Jimmy
261 listings starting at $2,495
Used Chevrolet Blazer
1,142 listings starting at $700
Used Ford Explorer Sport Trac
55 Great Deals out of 1,845 listings starting at $2,200

Used Cars For Sale

2003 GMC Sonoma SL Ext Cab 4WD For Sale
5 listings starting at $2,995