S Starts fine, but wont shift from 1st to 2nd; let off gas & shifts to Drive, bot will not shift into Overdrive.
Check the fluid level. You may want to consider having the transmission flushed. (I recommend BG Products flush system.) Properly flushing the trans removes any varnish the may have built up causing erratic behavior.
SOURCE: slight miss in engine, hard shift from 1st to 2nd long 2nd gear
Check both O2 sensor(s) and catalytic coverter.. P0420 means catalyst below threshold. Also check the sensor at the transmission and solenoid.
SOURCE: 1998 chevy k1500 4x4 4
first of all your truck is already in first gear when your going down the road....lol
SOURCE: Transmission won't shift!
Does it just not shift up to 3rd or when it shifts to 3rd it is just like neutral?
SOURCE: 4L60E Shifts fine in 1st, 2nd, & 3rd but will not shift into OD
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.
SOURCE: My 4L60E transmission will not shift into reverse or overdrive.
Needs rebuilt... www.TransmissionGarage.com
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You can try flushing the transmission, but many years of working on 4L60E's has shown me that it's time for a rebuild.
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