STEERING WHEEL/WHEEL & TIRE VIBRATION AT HIGHWAY SPEEDS. Pontiac Grand Am 1999

SUBJECT: STEERING WHEEL/WHEEL + TIRE VIBRATION AT HIGHWAY SPEEDS (REPLACE WHEELS - RPO PYO)

MODELS: 1999 PONTIAC GRAND AM SE WITH RPO PYO (16" ALUMINUM WHEELS)

BUILT PRIOR TO VIN BREAKPOINTS:

LANSING PLANT "C" - XC501542 LANSING PLANT "M" - XM722507

CONDITION:

SOME CUSTOMERS MAY COMMENT ON VIBRATION IN THE STEERING WHEEL AND/OR THE VEHICLE MAY EXHIBIT A WHEEL AND TIRE IMBALANCE WHEN OPERATED AT HIGHWAY SPEEDS.

CAUSE:

THIS CONDITION MAY BE CAUSED BY THE WHEEL NOT BEING CORRECTLY LOCATED DURING THE MACHINING PROCESS.

CORRECTION:

IDENTIFY AND REPLACE SUSPECT WHEEL ASSEMBLIES WITH NEW WHEELS (P/N 12368948), FOLLOWING THE INSPECTION/IDENTIFICATION PROCEDURE NOTED BELOW AND SERVICE PROCEDURE IN THE APPLICABLE SERVICE MANUAL.

1. REMOVE WHEELS FROM VEHICLE FOR INSPECTION.

2. LOCATE ON THE INBOARD OR BACK OF WHEEL BETWEEN THE MOUNTING HOLE'S TWO CIRCLES:

- ONE CIRCLE WILL CONTAIN THE MONTH AND YEAR PRODUCED INFORMATION (SEE FIGURE 1, SAMPLE 1).

- ONE CIRCLE WILL CONTAIN THE SHIFT AND DAY PRODUCED INFORMATION (SEE FIGURE 1, SAMPLE 2).

3. LOCATE "USA" STAMPED ON THE WHEEL WEB, FOLLOWED BY A ONE DIGIT NUMBER AND THEN A SINGLE LETTER. IF THE LETTER IS "M" AND THE WHEEL WAS PRODUCED ON OR BEFORE MAY 1, 1998, REPLACE THE WHEEL.

PARTS INFORMATION:

P/N DESCRIPTION ============== =======================================

12368948 WHEEL ASSEMBLY - 16" ALUMINUM

PARTS ARE CURRENTLY AVAILABLE FROM GMSPO.

WARRANTY INFORMATION:

FOR VEHICLES REPAIRED UNDER WARRANTY, USE:

LABOR OPERATION LABOR OPERATION NUMBER DESCRIPTION TIME =============== ================================= ===============

E0420 WHEEL - R + R OR REPLACE 0.7 HR

ADD: TO REPLACE EACH ADDITIONAL WHEEL 0.3 HR

THIS TIME IS UPDATED FROM THE CURRENT LABOR TIME GUIDE. THE NEXT UPDATE OF THE LABOR TIME GUIDE WILL CONTAIN THIS CHANGE.

FIGURES: 01 ATTACHMENTS: 00

Object Number: 484711 Size: SH

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.