Question about 1994 GMC Suburban

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Gmc suburban 1500 4 wheel drive 1994 is sending a

Gmc suburban 1500 4 wheel drive 1994 is sending a code 28 , and the trans shifts into all gears upon start then after warming up I lose all gears , let it cool and start again and it shifts then repeats the same problem any ideas thanks everyone

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Code 28 is transmission range pressure switch, check the fluid level and get back to me, hope this helps. Please rate my fix as i strive to be the best Thanks Ray

Posted on Dec 10, 2009

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Ive got a 2 wheel drive 85 gmc suburban 3/4ton with 454 and turbo 400. when i baught it there was a noise comin from tranny but only in first gear. it had no problems with shifting till i moved and towed a...


you can try flushing it using Seafome and replace your filter and fluid adding some trans tune with the new oil can git this things from most part stores . Hope this helps.

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On a 1994 gmc suburban recieving code 78


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Dec 10, 2009 | 1994 GMC Suburban

1 Answer

Have a 94 gmc 1500 4.3 automatic when i put it in drive it doesn't shift if i manuely shift from first to drive it will shift it doesn't have any slipping it also has overdrive that doesnt seem to work any...


Transmission does not shift automatically, only manually. Swap in a known-good PCM, check wiring, check other sensors such as VSS and TPS.

Trans shifts into gear harshly, car feels sluggish off the line
, No 1st, 4th or TCC lockup available, Manual 2nd, 3rd and Reverse are only available gears, CEL is on: Transmision is either in limp-home mode or has lost electrical power. If there are lots of error codes in the PCM, check the underhood fuse that powers the transmission, and if it pops again, look for a short in that circuit like an O2 sensor harness touching exhaust. Otherwise, check PCM codes for a particular fault in the transmission causing the PCM to put it in limp-home mode.

Car goes into gear but feels very sluggish like the brakes are dragging, but it will roll easily (starts out in 4th gear), you manually shift to 2 to get it moving, once it's moving you put it back in OD and the car shifts 3rd to 4th on its own and locks the converter at the appropriate time: ShiftB solenoid failed: Easy fix in the pan. Or a wiring problem from PCM to trans.. or PCM.

Good luck and get back to me, hope this helps.

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What model transmission is on my 92 4x4 Suburban 5.7 1500. (350)


Output shaft is generally a different lenght on the 2wd vs the 4wd.

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Transmission wont shift into 3rd gear.


I had this exact problem on my 2005 5.3L Suburban... It would shift into 1 and 2 and reverse, but not 3 and 4.

I took it into a transmission shop, and he said the 3-4 shift solenoid was burned up. Wanted 1500 to fix it. Far from home, so I have to pay it.

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