Should the check engine light come on if the transmission isn't shifting?


Asked by 92GMCBeast Feb 23, 2020 at 03:14 PM about the 1992 GMC C/K 2500 Series

Question type: Maintenance & Repair

My transmission isn't shifting while driving.
Shouldn't this cause a code? My check engine light
didn't come on. It comes on and goes off like it
should at start up. I ask because from what I've
read online is to find out the code to get the
problem. Will it give a code if the lights not on? It
takes a OBD1

3 Answers


OBD 1 is nothing like OBD 2, it may have stored some codes so you should check but don’t be surprised if nothing is there. Back then a lot of things could cause shifting problems, vacuum leaks, internal pressure loss, plugged screen, improperly set throttle linkage, TCM problems, shift solenoids, etc.

1 people found this helpful.

OBDi you won't pull any transmission codes, as back in 1992 the transmissions were hydraulically controlled not electronic. Time to take the truck into the transmission shop.

1 people found this helpful.

The Beast is back. I was able to use my paperclip and get a code 24 (Vehicle speed sensor), even though the check engine light wasn't on. This sensor is located on the transfer case on 4x4 and on the transmission on 2wd. It's been replaced and now she's happy.

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