Question about 1993 Chevrolet C1500
2000 gmc 4x4
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Posted on Jan 02, 2017
The EMC detected and problem so it's in limp mode, As long as it's in limp mode the 4th and OD will not activate. Take care not to burn up the transmission by running it hard while your in the limp mode.
Your going to have to get the truck scanned to clear any codes and why there are DTC codes. Auto Zone scan for free and most auto shops charge $10.00 to $20.00 to scan sine they want the business.
If you want to clear the codes your self you can put the ignition to the run position and pull the ECM (Batt) fuse out for 20 sec and place it back in then start the truck. It may stall but let it, just start it again and this would have cleared all the DTC code history.
The transmission should be running fine unless there is a problem and the service engine light will be on again and you'll be in limp mode still with an updated DTC in the ECM.
Good luck and hope this helps.
Posted on May 26, 2009
This is a very common problem. First off, is the trans just going neutral when it attempts to shift to 3rd? If so, most likely the 3-4 clutches are burnt up. If it is not attempting to upshift, may be electrical. Check the condition of your fluid, if it smells burnt, or is discolored, this is an indication of internal failure, you can also remove the pan, and check for contamination. Should also have the truck checked for codes, this can be done for free at Auto Zone. But been my experience, once you lose 3rd and 4th, most likely culprit is the 3-4 clutches, at which point you will need some type of overhaul.
Posted on Dec 03, 2009
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