94 Gmc K 2500 Service Manual
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.
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FULLY ILLUSTRATED 1994 CHEVROLET TRUCK & PICKUP FACTORY REPAIR SHOP & SERVICE MANUAL CD Includes C/K Trucks, Silverado, Cheyenne,. 1994 GMC Sierra Owner's Manual. This manual was prepared to acquaint you with the operation and maintenance of your 1994.
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.
Tooloose answered 3 years ago 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. Hotrod333 answered 2 years ago I had the same problem I couldn't shift out of second and when I could my overdrive was not working so I would burn through the gas i and couldn't figure it out. But I finally looked at where the wiring went into the Trans and found out the 4x4 linkage was to close to the wiring so every time I locked 4x4 in it would hit the wiring and push the plug in the transmission causing it to leak.
You have to clean out the plug going into your Trans I used wd-40, probably not the best thing but that's all I saw and then blow some air into it and lwt it dry unplug the battery for 30 mins and worked just fine. I don't not know why that 4x4 linkage is so close to the wiring ont the trans though. Oh yeah I have a 97 gmc k2500 350 4l80e.
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Original GMC Truck Factory Repair Manuals, written for GM Service Technicians and Dealer Shop Mechanics.
94 Gmc K1500 Transmission
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94 Gmc Sierra
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