1998 GMC Sierra TSBs

FOUR WHEEL DRIVE INOPERATIVE AND THE 4WD SERVICE LIGHT WILL ILLUMINATE.

SERVICE ENGINE SOON LIGHT AND P0300 WHEN TOWING, CRUISING UPHILL OR ON HARD ACCELERATION.

ENGINE COOLANT LEAK AT INTAKE GASKET.

MALFUNCTION INDICATOR LAMP ON WITH A P0300 SET AND A MISFIRE.

RATTLE NOISE IN ENGINE.

RATTLE NOISE IN ENGINE.

MALFUNCTION INDICATOR LAMP ON WITH A P0300 SET AND A MISFIRE.

DIAGNOSIS OF CRACKED OR BROKEN TRANSMISSION CASE.

SOME VEHICLES WILL NOT MOVE WHEN 4-WHEEL DRIVE IS REQUESTED, NOISE, SHUDDER, POOR PERFORMANCE, TRANSMISSION / TRANSFER...

DIAGNOSTIC INFORMATION FOR INTERMITTENT TRANSMISSION DOWNSHIFT, SLIP, BUSY/CYCLING TCC OR NOISY COOLING FAN.

4L60E, 4L65E FORWARD AND LOW REVERSE WAVED STEEL CLUTCH PLATE APPEARANCE CHANGE.

4L60-E AUTOMATIC TRANSMISSION OIL PUMP FIRST AND SECOND DESIGN IDENTIFICATION.

REDUCED STEERING EFFORT (DIAGNOSE/REPLACE STEERING WHEEL POSITION SENSOR).

REPLACEMENT OF CONNECTOR WHEN REPLACING FUEL TANK MODULE/FUEL PUMP MODULE.

4WD INOPERATIVE AND DIAGNOSTIC TROUBLE CODE (DTC) U1026 ATC FUSE OPEN.

INSTALLING A FUSE JUMPER HARNESS TO CORRECT A SHORT CIRCUIT IN THE ELECTRIC OUTSIDE REARVIEW MIRROR SWITCH.

ELECTRIC OUTSIDE REARVIEW MIRROR SWITCH SHORT CIRCUIT.

ANTILOCK BRAKE (ABS) ACTIVATION AT LOW SPEEDS ON VARIOUS MODELS INCLUDING THE 1995 AND 1996 ENVOY.

ANTILOCK BRAKE (ABS) ACTIVATION AT LOW SPEEDS.

SUPPLEMENT TO BULLETIN 99-06-04-047A FOR FUEL SYSTEM CLEANING.

SPRING SLAP NOISE FROM THE REAR OF THE GMT 400 SERIES TRUCK.

POOR PERFORMANCE FROM A STOP IN 2WD, AUTO OR 4WD HI.

SLIPS IN 4-WHEEL DRIVE, NOISE, VIBRATION, LEAKS, HOT ODOR.