Question about 1998 Chevrolet Suburban
98 K2500 4L80E 7.4Ltr. you can drive all day under 40 mph no problems OD works good. over 40 for 5 to 6 miles and will drop out of OD won't shift back in. come to a stop an hard shift 1st to 2nd, 2nd to 3rd. shut engine off for 10 min. and works great again. had fluid and filters changed, both shifting solnodes replaced. any input?
Fluid Change has nothing at all to do with a fix
Nothing at all & on a worn trans can cause slipping
In your case I assume a shop gave it a try
The hard shifts tell you the valve body needs cleaning
I would first look at all body data related to the trans,whatever
your truck has TCM Module whatever
I would check all bulletins at a repair shop in their data base
I would have a mechanic ride with you to look at the trans
with the scan tool on it & watch the speed sensor & any
external sensors you may have for correct data
No also check the brake switch
Does it go into Lock-up in most gears (brake sw )
Posted on Jul 27, 2013
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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 most likely the first signs of transmission failure. There's not much you can do aside from getting it rebuilt. This should be a 700 R4 they're a pretty easy transmission to rebuild, however you want to do it sooner than later. Many of the parts can be re-used IF you don't let it go too long. I've rebuilt hundreds of these and I'm here to tell you that I'd rather not destroy 500-600 dollars worth of hard parts if I don't have to.
Posted on Nov 09, 2009
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