INOPERATIVE OR ERRATIC SPEEDOMETER. GMC Truck Safari

SUBJECT: INOPERATIVE OR ERRATIC SPEEDOMETER AND/OR VEHICLE SHIFTS DOWN INTO SECOND GEAR OR WILL NOT SHIFT OUT OF SECOND GEAR (REPLACE CONNECTOR C240)

MODELS: 1993-94 CHEVROLET AND GMC TRUCK M/L VAN WITH 4L60E TRANSMISSION (RPO M30)

THIS BULLETIN IS BEING REVISED TO CORRECT THE PARTS INFORMATION. PLEASE DISCARD CORPORATE BULLETIN NUMBER 46-82-03 (SECTION 8 - CHASSIS/BODY ELECTRICAL).

CONDITION:

SOME OWNERS MAY EXPERIENCE INOPERATIVE OR ERRATIC SPEEDOMETER, WHICH COULD RESULT IN SETTING A DIAGNOSTIC TROUBLE CODE 24 OR 72; THE VEHICLE SHIFTING DOWN INTO SECOND GEAR, WHICH MAY SET A DIAGNOSTIC TROUBLE CODE 24; OR THE VEHICLE WILL NOT SHIFT OUT OF SECOND GEAR, WHICH COULD RESULT IN A DIAGNOSTIC TROUBLE CODE 72.

CAUSE:

MOISTURE IN THE INSTRUMENT PANEL HARNESS C240 CONNECTOR.

CORRECTION:

THIS CONNECTOR IS LOCATED ON THE PASSENGER SIDE KICK PANEL (FIGURE 1). DETERMINE SOURCE OF MOISTURE AND INSTALL PROPER SEAL TO PREVENT RECURRENCE OF MOISTURE INTRUSION. REPLACE C240 CONNECTOR WITH CONNECTORS (P/N 12117270 AND 12125675) AND TERMINALS (P/N 12045773). USE SILICONE GREASE ON TERMINALS TO PREVENT CORROSION. PROPER PROCEDURES FOR REPLACEMENT OF CONNECTORS AND TERMINALS WILL BE FOUND IN M/L SERVICE MANUAL #NATP-9443, SECTION 8A-2. BE CERTAIN TO LABEL WIRES PRIOR TO REPLACING CONNECTORS, TO ASSURE PROPER LOCATION IN NEW CONNECTORS.

SERVICE PARTS INFORMATION

P/N DESCRIPTION QTY

12167122 CONNECTOR 1 12125675 CONNECTOR 1 12045773 TERMINAL (PACKAGE OF 10) 1

PARTS ARE CURRENTLY AVAILABLE FROM GMSPO.

WARRANTY INFORMATION

FOR VEHICLES REPAIRED UNDER WARRANTY, USE:

LABOR OP DESCRIPTION LABOR TIME N6360 I/P WIRING AND/OR CONNECTOR-REPAIR USE PUBLISHED N6270 ENGINE WIRING AND/OR CONNECTOR-REPAIR LABOR OPERATION TIME

FIGURES: 1

CAPTIONS: FIGURE 1 - I/P HARNESS-TO-ENGINE HARNESS CONNECTOR

Object Number: 82818 Size: FS

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.