My Transmission does not move either forward or reverse...

www.fixya.com/cars/t3327109-isuzu_bighorn_automatic_transmission

5 answers
Nov 1, 2009 - Hi, i have got Isuzu Bighorn 3.1D 1993 model. ... When it slips it cant move even if yourave up the engine or even you you put in D1,D2,L.. ... Not check levels first. ... oil gets to hot and it also raises the heat-gauge, engine runs to hot. .... permission from Fixya Ltd. © 2005-2015, Fixya, Ltd. or it's affiliates. My 3.1 diesel Isuzu bighorn automatic transmission
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I recently tried the DIY service and repair manuals from a website and it actually helped me repair transmission problem in my jcb 3cx site-master. it wont move forward or reverse, engine is good both solenoids for forward and reverse work.
I don't have much technical knowledge but I just followed it step-wise, and works perfect! got it from www.reliable-store.com
All the best

hi paula
what year?
what country?
what model bighorn, bighorns vary by country.?
what engine?
what transmission , auto or stick shift?

the word gear , is no clue.
if not sure, send photo of truck then of the shifter

sounds like car needs service, no?

pump in transmission

When this light blinks it indicates a problem exists with the electronically controlled transmission, have it scanned for the fault code that is store in the control module.

This is an indication that the forward clutch pack has failed in the transmission or that the clutch pack has low hydraulic pressure from an internal fluid leak or a defective check ball. Pull the pan off the bottom of the transmission, if it is really full of dark sludge you will need to replace/repair the transmission.

Change your gearbox oil, and clean out the oil strainer.
Should help.

( On some models, you have to remove the gearbox oil pan to clean the strainer )

Problem is the detent springs for 4/5 gear have gone weak .
If you are handy its take the top off the gearbox from inside the car and you will see the plug then the springs and balls .
If not its a transmission shop job.

does it feel like its in 2 gears at once and dragging. what was the original trans problem(why you changed it)

My Torque on demand and 4 hi/low flashed for a couple days then stopped on it's own. There is a sensor somewhere under the truck that gets dirty from I was told.