Transfer Case Problem Code Co306

[LtE-36]

Gm Tech,

The dealer said my transfer case encoder motor is bad and threw code CO306 internal failure.All the wiring was checked and they insist the only fix is replacement.

I have located a rebuilt motor, do I just disconnect the pigtail and the three bolts and replace it?

Will it clear the code on its own like replacing an ABS module?

I just wanted to know what I was gettin into.

Thanks

Jim

[bobcat5544]

You will still have to get the code cleared out of the computer.

 

Transfer Case Encoder Motor Replacement

 

Removal Procedure

 

Remove the transfer case shield. Refer to Transfer Case Shield Replacement .

Remove the front propeller shaft. Refer to Propeller Shaft Replacement - Front in Propeller Shaft.

Disconnect the transfer case switch electrical connector (2).

Disconnect the encoder motor electrical connector (7).

Remove the encoder motor bolts.

Remove the encoder motor.

Remove the actuator insulator gasket.

If replacing the encoder motor, remove the locating pins from the old motor.

 

Installation Procedure

 

Important:

 

• If the encoder motor is being replaced because it is defective, ensure that the transfer case is in the neutral position. Manually shift the transfer case at the shift shaft, using a crescent wrench if necessary.

 

• When installing the encoder motor, ensure that the encoder motor is indexed correctly and the motor is flat against the transfer case before tightening the bolts.

 

• A if NEW encoder motor does NOT come with locating pins.

 

Install the locating pins to the NEW encoder motor.

Position a NEW actuator insulator gasket to the transfer case.

Install the encoder motor.

 

Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

 

Install encoder motor bolts.

Tighten

Tighten the bolts, in the sequence shown, to 20 N·m (15 lb ft).

Connect the encoder motor electrical connector (7).

Connect the transfer case switch electrical connector (2).

Install the front propeller shaft. Refer to Propeller Shaft Replacement - Front in Propeller Shaft.

Install the transfer case shield. Refer to Transfer Case Shield Replacement .

[LtE-36]

You will still have to get the code cleared out of the computer.

 

Transfer Case Encoder Motor Replacement

 

Removal Procedure

 

Remove the transfer case shield. Refer to Transfer Case Shield Replacement .

Remove the front propeller shaft. Refer to Propeller Shaft Replacement - Front in Propeller Shaft.

Disconnect the transfer case switch electrical connector (2).

Disconnect the encoder motor electrical connector (7).

Remove the encoder motor bolts.

Remove the encoder motor.

Remove the actuator insulator gasket.

If replacing the encoder motor, remove the locating pins from the old motor.

 

Installation Procedure

 

Important:

 

• If the encoder motor is being replaced because it is defective, ensure that the transfer case is in the neutral position. Manually shift the transfer case at the shift shaft, using a crescent wrench if necessary.

 

• When installing the encoder motor, ensure that the encoder motor is indexed correctly and the motor is flat against the transfer case before tightening the bolts.

 

• A if NEW encoder motor does NOT come with locating pins.

 

Install the locating pins to the NEW encoder motor.

Position a NEW actuator insulator gasket to the transfer case.

Install the encoder motor.

 

Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

 

Install encoder motor bolts.

Tighten

Tighten the bolts, in the sequence shown, to 20 N·m (15 lb ft).

Connect the encoder motor electrical connector (7).

Connect the transfer case switch electrical connector (2).

Install the front propeller shaft. Refer to Propeller Shaft Replacement - Front in Propeller Shaft.

Install the transfer case shield. Refer to Transfer Case Shield Replacement .

Thanks Bobcat

I replaced the motor no problems except one screw in the rear , the easist to get to had some bunged up threads, Icleaned them and it went in and tightened up, it probably will be a problem should the motor fail again. The t- case is made from some poor choice of metals IMO. My 4wd service light is off and Iam back enjoying my HD!!!!

Jim