dippin-dave-420
Newbie
someone on reddit told me it's the NP243 t-case , when i decoded the vin on a chevy website it said NP241 but i read online the 243 is just an electric 241 and since i have the push button im guessing it is the 243. options i have are 2hi 4hi and 4lo. nothing else "auto 4x4" etc. had a bad snow about 6 months ago hi went out first then hard to get into 4lo to get back home. once i did it's never came out since and ive tried ALOT by pushing that button with auto trans in neutral slowly rolling under 3mph like my manual says for both the manual floor shift and the push button i have. stuck a wire in the 13th pin on the obd 2 connector plug and grounded it to that nearby bolt under the dash i saw a guy on youtube using to test his and the truck goes from flashing all the lights when i turn the ignition to the run position , to flashing no lights at all if that wire is connected. bought a obd 2 blue tooth scanner called the elm 337 and while it works on my moms honda it doesnt on my GMC truck. dont know if it reads 4x4 codes or not anyway.
how do i go about figuring out if it's the front actuator the t-case actuator or the t-case encoder motor when im not able to get the switch to flash anything? when i press 2hi or 4hi while rolling under 3mph the tccm just clicks a bunch of times under the dash and the 2hi or 4hi light flashes then after a few seconds it goes back to the 4lo light and stops clicking. i dont here a click under the front end no more and also obviosuly dont hear the clunk of the t-case underneath me in the driver seat a second after now either.
any help is much appreciated. i havent been able to drive my truck in a long long time and it's my only vehicle.
how do i go about figuring out if it's the front actuator the t-case actuator or the t-case encoder motor when im not able to get the switch to flash anything? when i press 2hi or 4hi while rolling under 3mph the tccm just clicks a bunch of times under the dash and the 2hi or 4hi light flashes then after a few seconds it goes back to the 4lo light and stops clicking. i dont here a click under the front end no more and also obviosuly dont hear the clunk of the t-case underneath me in the driver seat a second after now either.
any help is much appreciated. i havent been able to drive my truck in a long long time and it's my only vehicle.