I just bought a 97 tahoe 1500 around 170k on it. When i test drove it everything was good 4wd was working but did have some other issues. After about a week p1870 code came up so ended up replacing the transmission valve body. Also had code for bank 2 sensor 1 o2 sensor replaced it. Replaced all fluids in trans, front diff, rear diff, transfer case, fuel filter, air filter and serpentine belt/tensioner. Previous owner just had plugs wire and distributor cap done and intake manifold replaced around 3000 miles ago.
After all the work i did on the the truck i went for test drive and found that the 4wd was not working. No lights come on when i turn on the ignition and no service 4wd light comes on. I checked the fuses with a meter and they were good and did the reset procedure where you turn ignition off and on 5 times. No change in symptoms and still no lights on 2wd 4wd hi 4wd lo on start or while running.
To me this seems like the TCCM has completely failed as i am not getting any codes or lights on dash.
Anyone have any experience with this 4wd system have any advice for me? All help is greatly appreciated
:help:.
After all the work i did on the the truck i went for test drive and found that the 4wd was not working. No lights come on when i turn on the ignition and no service 4wd light comes on. I checked the fuses with a meter and they were good and did the reset procedure where you turn ignition off and on 5 times. No change in symptoms and still no lights on 2wd 4wd hi 4wd lo on start or while running.
To me this seems like the TCCM has completely failed as i am not getting any codes or lights on dash.
Anyone have any experience with this 4wd system have any advice for me? All help is greatly appreciated
:help:.