DTC P0442 CAUSED BY EVAP VENT (SOLENOID) VALVE LEAK. GMC Truck Sonoma Pickup

SUBJECT: DTC P0442 CAUSED BY A EVAP VENT (SOLENOID) VALVE LEAK (CHECK EVAP VENT VALVE)

MODELS: 1997 CHEVROLET AND GMC C/K, M/L, S/T MODELS 1997 OLDSMOBILE BRAVADA WITH 4.3L V6 ENGINES (VINS W, X--RPOS L35, LF6)

CONDITION:

DEALERS MAY ENCOUNTER SOME VEHICLES, IDENTIFIED ABOVE, WITH AN ILLUMINATED MIL AND A STORED DIAGNOSTIC TEST CODE P0442 (EVAP CONTROL SMALL LEAK DETECTED).

THE EVAP VENT (SOLENOID) VALVE (ALSO KNOWN AS 'EVAP EMISSION CANISTER CONTROL VALVE') MAY HAVE A SLIGHT LEAK CAUSING THE DTC TO SET.

CAUSE:

THE EVAP VENT VALVE PLUNGER MAY BE TRAPPED (SOMETIMES INTERMITTENTLY) BY THE PLUNGER SPRING.

THE DTC MAY ALSO BE SET BY A SMALL LEAK IN THE EVAP SYSTEM DIAGNOSTIC CHARTS AND PROCEDURES SHOULD BE USED TO TROUBLESHOOT VEHICLES WITH KNOWN GOOD EVAP VENT VALVES.

CORRECTION:

AN IMPROVED EVAP VENT VALVE (P/N 12559015) HAS BEEN PUT INTO PRODUCTION AND RELEASED FOR SERVICE.

THE 1997 VEHICLE PRODUCTION CHANGE WAS MADE STARTING IN OCTOBER OF 1996. THE FOLLOWING VIN BREAKPOINTS HAVE BEEN ESTABLISHED:

ASSEMBLY PLANT (VEHICLE) FROM THROUGH ------------- -------- ------------------------ BALTIMORE 1997 SOP CHEV. 1GNDM19W8VB124491 (M/L VAN) GMC 1GTDL19W4VB511311

FT. WAYNE 1997 SOP CHEV. 1GBGC24R7VZ129970 (C/K) GMC 1GTEC14WXVZ509064

LINDEN 1997 SOP CHEV. 1GCNT18W4VK126500 (S/T) GMC 1GTCS1445VK502850

MORAINE 1997 SOP CHEV. 1GNDT13WXV2136801 (S/T) GMC 1GKDG13W4V2509001 OLDS. 1GHDT13W0V2689227

OSHAWA 1997 SOP CHEV. 2GCEC19W9V1134463 (C/K) GMC 2GTEC19WXV1511723

SHEREVEPORT 1997 SOP CHEV. 1GCDT19W4V8130300 (S/T) GMC 1GTCS1445V8509827

VEHICLES WITH A STORED DTC P0442, IDENTIFIED IN THE ABOVE VIN BREAKPOINTS, SHOULD HAVE THE EVAP VENT VALVE PART NUMBER CHECKED. VEHICLES WITH THE OLD EVAP VENT VALVE SHOULD HAVE THE NEW UNIT INSTALLED.

THE LAST FOUR (4) NUMBERS OF THE EVAP VENT VALVE PART NUMBER ARE STAMPED IN THE SOLENOID BODY (SEE FIGURE 1 BELOW).

(INSERT TPOL3103 HERE)

EVAP VENT VALVE REPLACEMENT SHOULD FOLLOW THE SERVICE MANUAL PROCEDURE.

IMPORTANT: THE VACUUM HOSE MUST BE PROPERLY ATTACHED TO THE EVAP VENT VALVE TO PREVENT LEAKS.

PARTS INFORMATION

COMPONENT GMSPO P/N ---------------------- --------- EVAP EMISSION CANISTER 12559015 CONTROL VALVE

PARTS ARE CURRENTLY AVAILABLE FROM GMSPO.

WARRANTY INFORMATION FOR VEHICLES REPAIRED UNDER WARRANTY, USE:

LABOR LABOR LABOR CODE OPERATION VEHICLE TIME ----- ---------------------- ------- -------- J6324 VALVE, EVAP. EMISS. C/K 0.2 HRS. CANISTER CONTROL M/L 0.3 HRS. - REPLACE S/T 0.2 HRS.

IMPORTANT: FUTURE LABOR TIME GUIDES WILL BE UPDATED.

FIGURES: 1 ATTACHMENTS: 0

FIG. 1 - EVAP VENT (SOLENOID) VALVE IDENTIFICATION

1 - LOCATION OF LAST 3 - EVAP VENT VALVE 4 NUMBERS OF P/N 4 - ELECTRICAL CONNECTOR 2 - BRACKET 5 - VACUUM HOSE

Object Number: 169170 Size: LF

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.