1994 GMC 4l60e transmission shifting problems


Asked by lostsoul Jan 17, 2011 at 07:46 PM about the 1994 GMC Sierra 1500 C1500 SLT Extended Cab LB

Question type: Maintenance & Repair

I've got a 1994 GMC Sierra 4X4 5.7 I purchased from an older couple. It has been sitting a year. She said years ago they had tranny trouble; it would stay in low. She took it to a shop where she said they cleaned a switch and reset the computer.
After that it worked fine for a long time, then would intermittently have the same problem, then be fine. I got the truck and it wouldn't shift out of low.I pulled the pan, which was real clean, just a very light coating of gray. I changed the 2-3 solinoid, new fluid and filter.  I also noticed the speedometer wasn't working.  I then changed the speed pickup on the transfer case, which did not help the speedometer.
Now the truck will shift 1-2 manually, but when you put it in drive, it free wheels: nothing at all; no drag or anything.  The computer just checks code 12.  If you put it in drive, it stays in low.  If you put it in low and lift the handle, it will go into second immediately and when you move to drive---nothing.
Will a bad computer do this? there is no governor or TV cable on this tranny....any ideas?
Today I must have gotten my 20 minutes on the computer, because I got error code 16, which is vehicle speed buffer....!  I need to know where it is....don't even know what it looks like!
Thanks---Stuck in the 70's

19 Answers


it'sbehind the glove box. open the box,and take out the black liner with 4-7mm bolts. look for a white square flat box with 2plugs going into it. thats ur vsb. make note of the numbers on it, they make many different ones!

23 out of 23 people think this is helpful.

Where can I find one? Dealer in town can't get one! Have any on-line ideas?

4 out of 4 people think this is helpful.
Robert Clark

sounds to me that it is the computer going cuz i replaced mine twice already and there not cheap!!!! but its worth it now cuz since i put this second one in ive never had a problem with it!!!

4 out of 4 people think this is helpful.

my tuck is doing the same thing and ur saying its not the shift sencer or anything cuz i also changed the one on the transfer case witch done nothing for me what did u really have to do to fix the problem??

15 out of 15 people think this is helpful.

I have a 94 Chevy Silverado 5.7 2wd 4L60e transmission. I had no head lights speed odometer quit working an trans would quit shifting out of 1st gear my diagnosis was to replace solenoid s A/b 1\2 2/3. An the TCC solenoid the signals from the power control model tells it when to shift check the Orange an yellow wire on the harness that connects to your driver side fire wall. 12volts to transmission to carry proper current

6 out of 6 people think this is helpful.
You think this is helpful.

Any questions or need of repair please call 513 808 5967

1 out of 1 people think this is helpful.

I have a 94 Chevy Silverado just used trany in it and it won't shift out makes noise going up hill

2 out of 2 people think this is helpful.
Frederick Heims Jr.

I had a similar problem a few weeks ago. Speedometer stopped working and my truck stopped shifting. I changed the speedometer censor located at the on the tail end of the transmission on the driver side. I purchased it at O'Reilly for $34

1 out of 1 people think this is helpful.

If you have a trans code reader and it codes 72 have a dealer check for bad selector switch. Regular code readers like a snap-on mt-2500 can read transmission data, as where other odb2 readers will not. Specialized tools are required to accurately diagnose trans problems! Leave this to the professional trans shops or GM Trained Professionals, it will get fixed faster, and cost less in the long run. Time is money, don't waste either guessing. 40 + year veteran in automotive repair.

Reggie Gardner

am having problems after 71/2 years n i have 250,000 miles its sayn P0753-P0758 shift solenoid ssb n P1864 nodef n P1886 nodef , can sum one tell me what i need to do , its still running n shitn out n am driven it but seam like sumthing is holdn it back !!! can sum one tell me what i need to fix to get it straight ????

12 out of 12 people think this is helpful.
Dwreck Slimms

Did youver get it fixed?


I have a 94 Chevy 1500 just put a tranny in and 1 and 2 nd work good but nothing in drive

3 out of 3 people think this is helpful.

Do I have to reset computer

3 out of 3 people think this is helpful.

Somebody help please it's my 3 tranny and all same issues no drive

2 out of 2 people think this is helpful.

check fluid level .


I bought a new computer and rebuilt tranny still no drive

Michael Hummell

can my trans make engine to lose power when gets hot?


my 94 gmc 1500 is acting likr this also. its an automatic , but when i put it in drive it will not shift out of 2nd, even when i shift from first to second manually it will go from first to second gear fine, then i put it in drive or overdrive and it will not shift again. also my speed odometer is acting really funny, its flying back and forth , definately think its an electric problem

3 out of 3 people think this is helpful.

Yes that's has happen to two of my 93 Chevy Silverado 4x4 , 1 and 2 fine then free wheel in overdrive. Just change 1-2 - 3-4 solenoids first and if that doesn't work change the computer per Ebay it's the cheapest. Hope this helps JJD

Your Answer

Add photo

Related Questions

Sierra 1500
Looking for a Used Sierra 1500 in your area?
CarGurus has 61,368 nationwide Sierra 1500 listings starting at $1,000.

Search GMC Sierra 1500 Questions

GMC Sierra 1500 Experts

#1 dragonflyoffshore
Reputation 3,250
#2 John Saffrahn
John Saffrahn
Reputation 2,180
#3 Glenn Clingenpeel
Glenn Clingenpeel
Reputation 1,770
View All

Related Models For Sale

Used Ford F-150"
2,634 Great Deals out of 160,763 listings starting at $1,299
Used Dodge Ram Pickup 1500"
661 Great Deals out of 12,834 listings starting at $1,500
Used Toyota Tacoma"
497 Great Deals out of 17,306 listings starting at $1,999
Used Chevrolet Tahoe"
565 Great Deals out of 29,621 listings starting at $1,990
Used GMC Yukon"
210 Great Deals out of 7,284 listings starting at $1,950
Used Jeep Wrangler"
607 Great Deals out of 43,072 listings starting at $3,000

Used Cars For Sale

2015 GMC Sierra 1500 For Sale
52 Great Deals out of 42,643 listings starting at $21,441
2014 GMC Sierra 1500 For Sale
118 Great Deals out of 3,757 listings starting at $17,900
2013 GMC Sierra 1500 For Sale
147 Great Deals out of 3,092 listings starting at $12,356
2012 GMC Sierra 1500 For Sale
98 Great Deals out of 2,287 listings starting at $13,000
2011 GMC Sierra 1500 For Sale
97 Great Deals out of 2,125 listings starting at $10,000