Could you tell me where the transfer case control module (TCCM) is in a new body style truck. Might also be called ATC or auto trac control.

 

Could it be called the encoder motor? I broke that part on my autotrac transfer case on my 99 Z71. Its the gear sensor and shift motor unit for the autotrac case. It was expensive. Its part #33 on the pic below:



(1) Input Shaft Seal
(2) Input Gear Bearing Outer Retaining Ring
(3) Adapter Stud
(4) Front Vehicle Speed Sensor
(5) Vent
(6) Clutch Lever Pivot Pin
(7) Front Case Half
(8) Location Pin
(8) Location Pin
(9) Input Gear Bearing
(10) Input Gear Bearing Retaining Ring
(11) Annulus Gear
(12) Annulus Gear Retaining Ring
(13) Clutch Lever Pivot Pin
(14) Front Output Shaft Bearing Retaining Ring
(15) Front Output Shaft Front Bearing
(16) Bracket
(17) Access Hole Plug
(18) Right Vehicle Speed Sensor
(19) Case Half Bolt
(20) Rear Bushing
(21) Rear Output Shaft Seal
(22) Fill Plug
(23) ID Tag
(24) ID Tag Screw
(25) Drain Plug
(26) Rear Case Half
(27) Front Output Shaft Rear Bearing
(28) Wear Clip
(29) Left Vehicle Speed Sensor
(30) Control Actuator Lever Bearing
(31) Control Actuator Lever Retaining Ring
(32) Encoder Motor Insulating Spacer
(33) Encoder Motor
(34) Encoder Motor Bolt
(35) Encoder Motor Location Pin
(36) Front Output Shaft Seal
(37) Front Output Shaft Bearing Retaining Ring

 

well, im dont even have the autotrac case anymore. I replaced it with a np241. Im trying get get the service 4x4 light off. I was thinking if i pulled the plug on whatever sends the error code to the DIC, then it would turn off.

 

parish8 had the same issue. He pulled off part #33 from above, plugged it into the harness, then tied it up the the frame. Light went off and it thinks its doing something when its not.

 

Get nelson to put you another tune together with the VIN from a truck that came with the manual transfer case instead of the autotrac. Then it wouldn't be looking for the encoder signal.

My SS with the AWD case shows up as a manual 4wd in the PCM.

 

He already tuned it with a 2wd tune.

 

doesnt he still have a front actuator still in though? Thats unplugged on mine as well.

 

I think he does.

He was getting a 4wd light that turned off when he plugged in that encoder to the harness. Of course, you could have different causes for the same light.

 

my cause is because I dont have any of teh stock 4wd stuff left!