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Shift solenoids were stuck on. This could be caused by several issues. Speed sensor could be bad, throttle position sensor could be bad, etc. This is causing the car to go into "limp-in" mode. This causes the transmission to remain in 2nd gear to allow you to get to a repair shop. Have autozone clear the codes and see if it acts up again. Usually, limp-in mode can be stopped by stopping the car, turning it off, and re-starting it. Codes will remain stored in the computer until cleared by an automotive technician.
Recommend you consult with your local certified transmission mechanic. They will have code readers that can talk to the transmission and not just the general codes.
If possible remove the transmission pan for further diagnosis. Excessive debris or metal particles on the transmission pan is typically an indication of mechanical failure such as clutches, meaning a rebuild.
If it comes to a rebuild, have yours rebuilt versus a swap out. This way you'll know everything bolts up correctly and you have all the brackets, etc.
Sounds like your transmission is in limp mode. This is a fault mode in which the
transmission either loses electrical power or the PCM deactivates all of
the electronics. The transmission will default to max line pressure.
The driver will have Reverse and 3rd, with manual 2nd available by
putting the gearshift in 2 or 1 (doesn't matter). 1st, 4th, and TCC
lockup will not be available. It will not hurt the car to drive it like
this for short periods, but use manual 2nd to get the car moving, and be
aware that the trans will generate more heat than normal while
operating in limp-home mode due to increased torque converter slippage
during 2nd gear starts and no lockup in 3rd gear.
The other from what you described, trans shifts 2nd to 3rd by itself in D or OD and locks the converter : ShiftA solenoid failed. Easy fix in the pan. Or a wiring problem from PCM to trans.. or PCM.
Thank you for using fixya and have your Safari scanned for the DTC codes that would indicate what issues your transmission is having to put you in to limp mode.
Does it happen after awhile or right away? If after awhile, it sounds like the transmission is overheating and causing the truck to go into 'limp' mode.
This is called the limp mode. It means that you have a transmission problem. It goes into limp mode to protect the transmission from total failure. You need to take it to a transmission shop to perform a diagnosic test to see if it needs repair or replace
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.
Its an Allison T1000 2wd
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