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hi guys! i have a 05gmc 3500 dually i have reverse only no forward gears at all-trans fluid all ok! prindle flashes in forward gears and message is range selection inhibited ! no codes!! tried nsub switch no different! HELP PLEASE!!! :)
 

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bubba;1583275; said:
hi guys! i have a 05gmc 3500 dually i have reverse only no forward gears at all-trans fluid all ok! prindle flashes in forward gears and message is range selection inhibited ! no codes!! tried nsub switch no different! HELP PLEASE!!! :)
When you say you "tried' the NSBU switch, what do you mean? Replaced it? Who's instructions did you follow? Are you sure you kept the shaft lined up correctly?

What're you using to pull codes?

If you put the shifter in the position which should be "D", what happens?
 

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As asked above, did you installed the new NSBU with the tranny in neutral? The new switch comes in the neutral position, held in this position by the metal clip that is removed after installation.
Also, I believe if you had issues with the old NSBU and set a code, you may have to clear this code.
Eric or Mike L. could answer this.
Search "NSBU", and do some reading.
 
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