1997 gmc k1500, np243 transfer case. new accuator, new dash switch, new encoder motor. Still no 4 wheel hi, 2wheel hi and 4 wheel low working - no...

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hello, how are you today?

Does the encoder motor sound like its trying to shift into 4wd? and are the lights on the switch illuminated?

okay, one thing i would try to do is 'reset' the transfer case control module by unplugging it for a few minutes, and reconnecting.

it may be possible that you have a binding transfer case, so we might need to try to shift it manually. The transfer case module will

be located in the dash to left of the instrument panel cluster. Ive had a few lock up on me in the past and just needed reset after an

encoder motor replacement. i will also try to locate a picture or diagram of the transfer case control module

By your description the wiring may be ok becuase the encoder motor is "trying" to operate.

okay, have you actually disconnected the tccm and reconnected it? it really sounds like an issue in that sort, and just want to rule that out

and simple and ineffective as that may sound...

Thats awesome Ron, i can respect that, im getting into dirt track racing actually this year following.

i know how frustrating the brains and wiring of some of these vehicles can be. Just let me know what you come up with sir and

ill exhaust every resource i have available to help you get this 4wd issue resolved! Thank you

Dear Ron Rice,

It was a pleasure helping you with you 4 wheel drive issue today.

Here is summary of the resolution

Issue identified:

4wd high and low inoperative, 4wd high light stays flashing

Solution implemented:

Disconnect transfer case control module for 2+ minutes, check connections and reconnect then retest 4wd operation.

If issue resurfaces:

Recommend replacing Transfer Case Control Module, and checking connector pins for integrity.

Thank you Ron!

Hi Ron , first off I would remove the transfer case fuse for 3 minutes, then cycle the ignition 5 times with a 5 second delay between clicks.If that does not do anything mechanically wise I would say to look for anything unusual under the car, loose bolts, bad wiring ect. The transfer case control modules in the k1500's have been known to have bad connections at the control box . One other thing I would double check is the actuator as in my experience they aren't the most reliable pieces in cars. I hope this advice has and hopefully will help you with your issues.