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I stopped buying used ones they are all take outs like yours with worn keys. If all else is good on yours sometimes you can get a rebuild kit for the keys. There are a few different part numbers that are all wtec3 keypads. As long as they look the same and the connector is the same they all seem...

Did you put a multimeter on the fuel solenoid contacts with the dash switch on? Outer terminal is positive. Go from the outer terminal to chassis to see if it's a bad ground. Fuel solenoid comes on with 24v power relay. Could be on a breaker though. To access codes the trans control needs to be...

Swap the keypad. It's not hard to do.

You can take the keypad out and take it apart it's small torx screws. Look for visible damage. Low voltage bad grounds will cause all kinds of trans issues so of you are having relay chattering on start and you have a bad ground or other electrical issue at the panel I would fix that first. I...

In n, press and hold arrow up and arrow down at the same time for 3 seconds. I have seen a lot of bad keypads. Water drips in around the running lights above the windshield. Had one that would put itself in drive without being touched. Lucky for me the parking brake worked well. Would have been...

Hold up and down arrows it will go into diag mode and display numeric error codes. Usually it will do 1 then a code one digit at a time then 2 and the next code. Wtec 3 will prevent engagement with a fluid level that's low enough to not be able to operate or cause damage.

You will def get an error with no fluid in the trans

The wtec3 does a "continuity" test on the trans solenoids before engaging. Its less forgiving than the wtec2 control. Had one with a few nicks in the cab to trans harness was making the wtec3 control error. It came up with bad solenoid codes, since it saw abnormally high resistance in the test...

They go from the batt box to the polarity box under the spare tire then along the frame and up into the cab and bolt to the backside of the panel lugs. Bad batts can cause the same issue. I have seen someone leave a ground off the starter and that happen also.

Ground to cab panel or ground connection at battery. Run a temp ground from batts to panel binding post.