INFORMATION ON TRANSFER CASE ENCODER MOTOR DAMAGE. GMC Truck S15 Pickup

SUBJECT: INFORMATION ON TRANSFER CASE ENCODER MOTOR DAMAGE WHEN ACTIVATED OFF VEHICLE

MODELS: 1992-94 CHEVROLET AND GMC T TRUCKS EQUIPPED WITH NP 233 ELECTRIC SHIFT TRANSFER CASE (RPO NP1)

IF THE ENCODER MOTOR IS ENERGIZED OR ACTIVATED WHEN IT IS NOT ATTACHED TO THE TRANSFER CASE, THE SHIFT MOTOR INTERNAL TO THE ENCODER WILL NOT HAVE A POSITIVE STOP AND DAMAGE TO THE INTERNAL GEARS MAY RESULT.

TO PREVENT DAMAGE, DO NOT ENERGIZE OR ACTIVATE THE ENCODER MOTOR WHEN IT IS NOT PROPERLY ATTACHED TO THE TRANSFER CASE. FOR DIAGNOSIS OF THE TRANSFER CASE, REFER TO SECTION 7D TRANSFER CASE IN THE APPROPRIATE S/T SERVICE MANUAL, DIAGNOSIS OF THE TRANSFER CASE.

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GENERAL MOTORS BULLETINS ARE INTENDED FOR USE BY PROFESSIONAL TECHNICIANS, NOT A "DO-IT-YOURSELFER". THEY ARE WRITTEN TO INFORM THOSE TECHNICIANS OF CONDITIONS THAT MAY OCCUR ON SOME VEHICLES, OR TO PROVIDE INFORMATION THAT COULD ASSIST IN THE PROPER SERVICE OF A VEHICLE. PROPERLY TRAINED TECHNICIANS HAVE THE EQUIPMENT, TOOLS, SAFETY INSTRUCTIONS AND KNOW-HOW TO DO A JOB PROPERLY AND SAFELY. IF A CONDITION IS DESCRIBED, DO NOT ASSUME THAT THE BULLETIN APPLIES TO YOUR VEHICLE, OR THAT YOUR VEHICLE WILL HAVE THAT CONDITION. SEE A GENERAL MOTORS DEALER SERVICING YOUR BRAND OF GENERAL MOTORS VEHICLE FOR INFORMATION ON WHETHER YOUR VEHICLE MAY BENEFIT FROM THE INFORMATION.