IllustrationCONSUMER STATES THAT WHILE DRIVING AND WITH NO WARNING VEHICLE WILL STALL, AND IT WILL BE HARD FOR THE CONSUMER TO CONTROL THE VEHICLE. DEALER NOTIFIED.*AK
1999 Chevrolet Monte Carlo
Owner reports · Recalls · Investigations
Limited comparison data
There is not enough comparable history to draw a useful model-year comparison.
About this comparison →How this year compares
Owner complaints by model year
Compare all Monte Carlo years →Counts vary with age, sales and reporting. They are not failure rates.
What owners reported most
All reported categories
Tap a category to read its complaints. One report may name several components.
When problems were reported
Mileage at the reported incident
20–25K
625–50K
1050–75K
1575–100K
5100–150K
6150K+
44 reports with mileage · 81 unknown
NHTSA’s mileage field refers to the reported incident, not necessarily the filing date. This shows report counts, not the likelihood of a failure.
What to inspect
Issues worth paying extra attention to based on owner reports.
- Service Brakes, Hydraulic. Review the 45 owner reports in this category and discuss these concerns during a pre-purchase inspection. Read reports →
- Engine And Engine Cooling. Review the 31 owner reports in this category and discuss these concerns during a pre-purchase inspection. Read reports →
- Electrical System. Review the 10 owner reports in this category and discuss these concerns during a pre-purchase inspection. Read reports →
NHTSA owner reports · September 18, 2026 snapshot.
5 crash reports6 fire reports1 injury reports
What owners actually said
125 reportsCONSUMER STATES THAT INTAKE MANIFOLD IS CRACKED. DEALER NOTIFIED.*AK
LEFT FRONT WHEEL HUB ASSEMBLY FAILURE, TIE ROD END & ELEC SENSORS ON LH AXLE THAT HELP OPERATE ABS (WHEEL SPEED SENSORS), TORQUE CONVERTER SLIPPAGE.: LEFT FRONT TIRE WAS NOT SECURE AND WOBBLED DURING DRIVING DUE TO FAULTY HUB ASSEMBLY; ABS WHEEL SPEED SENSOR CRACKED CAUSING ABS NOT TO WORK PROPERLY; TRANSMISSION SLIPS OUT OF OVE…
Read full complaint
LEFT FRONT WHEEL HUB ASSEMBLY FAILURE, TIE ROD END & ELEC SENSORS ON LH AXLE THAT HELP OPERATE ABS (WHEEL SPEED SENSORS), TORQUE CONVERTER SLIPPAGE.: LEFT FRONT TIRE WAS NOT SECURE AND WOBBLED DURING DRIVING DUE TO FAULTY HUB ASSEMBLY; ABS WHEEL SPEED SENSOR CRACKED CAUSING ABS NOT TO WORK PROPERLY; TRANSMISSION SLIPS OUT OF OVERDRIVE UNDER NORMAL HIGHWAY DRIVING SPEEDS WHEN GEARSHIFT IS IN THE "OD" POSITION; CAR STARTS OFF IN WHAT APPEARS TO BE TOO HIGH OF A GEAR MAKING IT VERY SLUGGISH TO MOVE-DANGER TO PULL INTO TRAFFIC WITH THIS. LOCAL GM DEALER MECHANIC STATED HE HAS REPORTED THE FAULTY WHEEL SPEED SENSOR PROBLEM TO GM BECAUSE MANY VEHICLES OF THIS SAME MODEL HAVE HAD SAME PROBLEM FOR WHICH THE ABS CONTROL MODULE HAD BEEN REPLACED IN ERROR NOT SOLVING THE PROBLEM-VEHICLE MAKES "CLICKING" SOUND WHEN APPLYING BRAKES AND CAUSES HEADLIGHTS TO DIM AND FLASH MAKING IT APPEAR THAT I AM TRYING TO "FLASH" ANOTHER VEHICLE WITH MY HEADLIGHTS-THIS COULD PROVE TO BE EXTREMEMLY UNSAFE ESPECIALLY IF SOMEONE HAS THE BELIEF THAT MY FLASHING HEADLIGHTS ARE GIVING THEM AN OK TO MAKE A TURN OR OTHER MANEUVER, WHEN IN FACT I AM NOT.*AK
MY 1999 CHEVROLET MONTE CARLO LS, ENGINE 3100 V-6, HAS NEEDED A PARTICULARLY EXPENSIVE REPAIR TWICE. THIS REPAIR WAS TO FIX A COOLANT LEAK NEAR/ON THE INTAKE MANIFOLD GASKET. THE FIRST REPAIR (AT 52,000 MILES) WAS DONE UNDER WARRANTY, THE SECOND (AT 90,000 MILES) WAS DONE AT A LOCAL SERVICE STATION BECAUSE THE CAR WAS NO LONGE…
Read full complaint
MY 1999 CHEVROLET MONTE CARLO LS, ENGINE 3100 V-6, HAS NEEDED A PARTICULARLY EXPENSIVE REPAIR TWICE. THIS REPAIR WAS TO FIX A COOLANT LEAK NEAR/ON THE INTAKE MANIFOLD GASKET. THE FIRST REPAIR (AT 52,000 MILES) WAS DONE UNDER WARRANTY, THE SECOND (AT 90,000 MILES) WAS DONE AT A LOCAL SERVICE STATION BECAUSE THE CAR WAS NO LONGER UNDER WARRANTY. WITH THIS PROBLEM, THE COOLANT LEAKS OUT FAIRLY QUICKLY, AND COULD CAUSE AN ENGINE FIRE IF THE ENGINE GETS TOO HOT, ALSO THE COOLANT IS FLAMMABLE. THIS PROBLEM WAS THE SUBJECT OF A RECALL OF SEVERAL GM MODELS WITH 2000 TO 2002 MODEL YEAR CARS (CHEVY, PONTIAC, ETC) WITH THE 3100 AND 3800 ENGINE MODELS. HOWEVER, THE 1999 MODELS HAVE NOT BEEN RECALLED, AND MY CAR WITH I KNOW MANY OTHERS HAVE THE SAME PROBLEMS WITH THE SAME ENGINE PARTS AS THE 2000 TO 2002 MODEL YEAR CARS. I PAID THE SECOND REPAIR AT MY OWN EXPENSE OF APPROXIMATELY $825. I HAVE CALLED CHEVROLET AND THEY HAVE DENIED ANY REIMBURSEMENT FOR MY EXPENSES INCURRED FOR THE REPAIR. IS THERE ANY OTHER WAY I CAN SSEK TO HAVE THE REPAIR REIMBURSED? IN ANY CASE, SHOULDN'T THE RECALL AFFECT THE 1999 OR PREVIOUS MODELS?*AK
CONSUMER CALLED COMPLAINING ABOUT HAVING AIR BAG PROBLEMS. MANUFACTURER WAS NOT CONTACTED AT THE TIME OF THIS CALL.*AK
ON FEBRUARY 14TH 2003 I WAS INVOLVED IN AN ACCIDENT WHERE I WAS HIT FROM BEHIND. THE BACKS OF THE SEATS DO NOT LOCK IN PLACE SO WHEN HIT FROM BEHIND THE SEATBACK ALSO FLEW FORWARD WITH ME. I FEEL THIS PROBLEM WITH THE SEATBACKS MADE MY INUJURIES WORSE THAN WHAT THEY SHOULD HAVE BEEN.*AK
BRAKE PADS NEED TO BE REPLACED EVERY 3 TO 6 MONTHS. ROTORS WERE CUT AND THEN NEW ROTORS REPLACED. I LIVE IN A RURAL AREA NOT BUMPER-TO-BUMPER, CITY TRAFFIC. I ALSO DO NOT RIDE MY BRAKES. THERE SEEMS TO BE A MAJOR DEFECT IN THE MONTE CARLO BRAKE SYSTEM. I JUST HAD TO HAVE A NEW ALTERNATOR REPLACED ON MY 1999 MONTE CARLO. I …
Read full complaint
BRAKE PADS NEED TO BE REPLACED EVERY 3 TO 6 MONTHS. ROTORS WERE CUT AND THEN NEW ROTORS REPLACED. I LIVE IN A RURAL AREA NOT BUMPER-TO-BUMPER, CITY TRAFFIC. I ALSO DO NOT RIDE MY BRAKES. THERE SEEMS TO BE A MAJOR DEFECT IN THE MONTE CARLO BRAKE SYSTEM. I JUST HAD TO HAVE A NEW ALTERNATOR REPLACED ON MY 1999 MONTE CARLO. I AM VERY UNSATISFIED AND WILL DEFINITELY NOT BUY ANOTHER GM PRODUCT. *JB
I HAVE A 1999 MONTE CARLO THAT WAS PURCHASED IN MID 1999. EVER SINCE I PURCHASED IT AND IT RAINS, THE WIPERS FREEZE IN THE MIDDLE OF MY WINDSHIELD. THIS MAKES IT VERY DIFFICULT TO DRIVE WHEN IT REALLY RAINS OR EVEN NIGHT TIME RAINY WEATHER. OVER THE PAST YEAR OR SO, NOW IT EVEN DOES IT WHEN IT SNOWED OUT. THIS HAS HAPPENED WELL …
Read full complaint
I HAVE A 1999 MONTE CARLO THAT WAS PURCHASED IN MID 1999. EVER SINCE I PURCHASED IT AND IT RAINS, THE WIPERS FREEZE IN THE MIDDLE OF MY WINDSHIELD. THIS MAKES IT VERY DIFFICULT TO DRIVE WHEN IT REALLY RAINS OR EVEN NIGHT TIME RAINY WEATHER. OVER THE PAST YEAR OR SO, NOW IT EVEN DOES IT WHEN IT SNOWED OUT. THIS HAS HAPPENED WELL OVER 10 TIMES IN THE PAST 4 YEARS THAT I HAVE OWNED THIS VEHICLE. I HAVE TAKEN IT IN TO SEVERAL CHEVY DEALERSHIPS AND THEY ALL SAY THE SAME THING "NOTHING SEEMS TO BE WRONG HERE. JUST KEEP AN EYE ON IT AND LET US KNOW IF WE CAN HELP YOU WITH ANYTHING ELSE..." I FEEL THAT THEY JUST DON'T WANT TO LOOK AT MY CAR, SEEING THAT I AM FEMALE. I GET THIS IMPRESSION BECAUSE THEY ONLY TOOK ABOUT 5 MINUTES TO LOOK AT IT AND CAME TO THAT CONCLUSION. IS THERE ANYTHING THAT I CAN DO, SEEING NOW THAT MY CAR IS WAY OUT OF WARRANTY. *AK
THE DEALERSHIP REPLACED THIS SUNROOF WHILE THE VEHICLE WAS STILL UNDER WARRANTY. THE TRACK IS BROKEN AGAIN. THE DEALERSHIP CAN'T REPAIR IT AGAIN BECAUSE IT IS OUT OF WARRANTY. CHEVROLET REFUSES TO ACKNOWLEDGE A PROBLEM WITH THE SUNROOF. THE GUY THAT OWNS THE PLACE WHERE I AM HAVING IT REPAIRED SAYS HE HAS REPLACED HUNDREDS OF T…
Read full complaint
THE DEALERSHIP REPLACED THIS SUNROOF WHILE THE VEHICLE WAS STILL UNDER WARRANTY. THE TRACK IS BROKEN AGAIN. THE DEALERSHIP CAN'T REPAIR IT AGAIN BECAUSE IT IS OUT OF WARRANTY. CHEVROLET REFUSES TO ACKNOWLEDGE A PROBLEM WITH THE SUNROOF. THE GUY THAT OWNS THE PLACE WHERE I AM HAVING IT REPAIRED SAYS HE HAS REPLACED HUNDREDS OF THEM ON THE MONTE CARLO. CHEVROLET USED A PLASTIC TRACK INSTEAD OF A METAL TRACK AND THAT IS WHY THEY BREAK. IT IS A MINIMUM OF A $1300 CHARGE TO REPLACE THIS SUNROOF. CHEVROLET COULD HAVE USED AN ALUMINUM TRACK AND HAVE AVOIDED THIS FINANCIAL DRAIN ON THE CONSUMER. *TT
INTAKE MANIFOLD GASKET LEAK, 1999 CHEV MONTE CARLO. NOTICE LOW RADIATOR COOLANT AT ABOUT 50M, PROBLEM GOT WORSE AND FOUND THAT DEXCOOL COOLANT WAS LEANKING TO THE OUTSIDE OF THE ENGINE FROM THE INTAKE MANIFOLD.
Official recalls
315V701000 · Engine And Engine Cooling:engine; Engine And Engine Cooling:exhaust System:manifold/header/muffler/tail Pipe
Oct 26, 2015
General Motors LLC (GM) is recalling certain model year 1998-1999 Chevrolet Lumina and Oldsmobile Intrigue, 1997-2004 Buick Regal and Pontiac Grand Prix, 2000-2004 Chevrolet Impala, and 1998-2004 Chevrolet Monte Carlo vehicles. The affected vehicles were previously repaired under recalls 08V-118, 09V-116, and 15V-201 to address the possibility that engine oil may drip onto the hot exhaust manifold.
Consequence & remedy
Consequence: Engine oil that drips onto the hot surface of the exhaust manifold may result in a fire.
Remedy: The remedy applied under recalls 08V-118, 09V-116, and 15V-201 did not adequately remove the safety risk. Under the improved remedy, dealers will replace the engines front valve cover and gasket. Vehicles that are covered by recalls 08V-118, 09V-116, or 15V-201 that have not yet received the original remedy will instead receive the improved remedy under the original recall number. The recall began on February 19, 2016. Owners may contact Chevrolet customer service at 1-800-222-1020, Buick customer service at 1-800-521-7300, Oldsmobile customer service at 1-800-442-6537 and Pontiac customer service at 1-800-458-8006. GM's number for this recall is 15757. Note: Until the improved remedy has been applied, owners are advised to park their vehicle outside since the fire risk exists even when the vehicle is unattended.
Additional source detail variants (2)
Engine And Engine Cooling:exhaust System:manifold/header/muffler/tail Pipe
General Motors LLC (GM) is recalling certain model year 1998-1999 Chevrolet Lumina and Oldsmobile Intrigue, 1997-2004 Buick Regal and Pontiac Grand Prix, 2000-2004 Chevrolet Impala, and 1998-2004 Chevrolet Monte Carlo vehicles. The affected vehicles were previously repaired under recalls 08V-118, 09V-116, and 15V-201 to address the possibility that engine oil may drip onto the hot exhaust manifold.
Consequence: Engine oil that drips onto the hot surface of the exhaust manifold may result in a fire.
Remedy: The remedy applied under recalls 08V-118, 09V-116, and 15V-201 did not adequately remove the safety risk. Under the improved remedy, dealers will replace the engines front valve cover and gasket. Vehicles that are covered by recalls 08V-118, 09V-116, or 15V-201 that have not yet received the original remedy will instead receive the improved remedy under the original recall number. The recall began on February 19, 2016. Owners may contact Chevrolet customer service at 1-800-222-1020, Buick customer service at 1-800-521-7300, Oldsmobile customer service at 1-800-442-6537 and Pontiac customer service at 1-800-458-8006. GM's number for this recall is 15757. Note: Until the improved remedy has been applied, owners are advised to park their vehicle outside since the fire risk exists even when the vehicle is unattended.
Engine And Engine Cooling:engine
General Motors LLC (GM) is recalling certain model year 1998-1999 Chevrolet Lumina and Oldsmobile Intrigue, 1997-2004 Buick Regal and Pontiac Grand Prix, 2000-2004 Chevrolet Impala, and 1998-2004 Chevrolet Monte Carlo vehicles. The affected vehicles were previously repaired under recalls 08V-118, 09V-116, and 15V-201 to address the possibility that engine oil may drip onto the hot exhaust manifold.
Consequence: Engine oil that drips onto the hot surface of the exhaust manifold may result in a fire.
Remedy: The remedy applied under recalls 08V-118, 09V-116, and 15V-201 did not adequately remove the safety risk. Under the improved remedy, dealers will replace the engines front valve cover and gasket. Vehicles that are covered by recalls 08V-118, 09V-116, or 15V-201 that have not yet received the original remedy will instead receive the improved remedy under the original recall number. The recall began on February 19, 2016. Owners may contact Chevrolet customer service at 1-800-222-1020, Buick customer service at 1-800-521-7300, Oldsmobile customer service at 1-800-442-6537 and Pontiac customer service at 1-800-458-8006. GM's number for this recall is 15757. Note: Until the improved remedy has been applied, owners are advised to park their vehicle outside since the fire risk exists even when the vehicle is unattended.
09V116000 · Engine And Engine Cooling
Apr 8, 2009
GENERAL MOTORS IS RECALLING 1,497,516 MY 1997-2003 BUICK REGAL, MY 1998-2003 CHEVROLET LUMINA, MONTE CARLO AND IMPALA, MY 1998-1999 OLDSMOBILE INTRIGUE, MY 1997-2003 PONTIAC GRAND PRIX VEHICLES EQUIPPED WITH A 3.8L V6 NATURALLY ASPIRATED ENGINE. SOME OF THESE VEHICLES HAVE A CONDITION IN WHICH DROPS OF ENGINE OIL MAY BE DEPOSITED ON THE EXHAUST MANIFOLD THROUGH HARD BRAKING.
Consequence & remedy
Consequence: IF THE MANIFOLD IS HOT ENOUGH AND THE OIL RUNS BELOW THE HEAT SHIELD, IT MAY IGNITE INTO A SMALL FLAME AND MAY SPREAD TO THE PLASTIC SPARK PLUG WIRE CHANNEL AND BEYOND INCREASING THE RISK OF AN ENGINE COMPARTMENT FIRE.
Remedy: DEALERS WILL REPLACE THE ENGINES FRONT VALVE COVER AND FRONT-VALVE-COVER GASKET WITH NEW PARTS OF AN IMPROVED DESIGN AND REMOVE THE ENGINES PLASTIC COVER AND PLASTIC OIL-FILL-TUBE EXTENSION, FREE OF CHARGE. THE RECALL IS EXPECTED TO BEGIN DURING MAY 2016. OWNERS MAY CONTACT CHEVROLET AT 1-800-630-2438, OLDSMOBILE AT 1-800-630-6537, AND PONTIAC AT 1-800-620-7668 OR HTTP://WWW.PONTIAC.COM OR HTTP:WWW.GMOWNERCENTER.COM.
02V329000 · Air Bags:frontal
Dec 9, 2002
ON CERTAIN PASSENGER, SPORT UTILITY VEHICLES AND MINI VANS, SOME OF THESE VEHICLES HAVE A PASSENGER AIR BAG THAT WAS MANUFACTURED WITHOUT A CHECK VALVE PIN. AN AIR BAG WITHOUT THE CHECK VALVE PIN COULD PRODUCE INCREASED PRESSURE AT THE ONSET OF THE AIR BAG DEPLOYMENT AND REDUCED PRESSURE AFTERWARD.
Consequence & remedy
Consequence: THIS COULD INCREASE THE SEVERITY OF INJURY TO A PERSON WHO WAS NOT PROPERLY RESTRAINED AND WHO WAS CLOSE TO THE PASSENGER AIR BAG AT THE TIME OF DEPLOYMENT. IT COULD ALSO REDUCE THE AB8ILITY OF THE AIR BAG TO PROTECT A RESTRAINED FRONT SEAT PASSENGER.
Remedy: DEALERS WILL INSPECT AND, IF NECESSARY, REPLACE THE PASSENGER AIR BAG. OWNER NOTIFICATION BEGAN DECEMBER 16, 2002. OWNERS WHO TAKE THEIR VEHICLES TO AN AUTHORIZED DEALER ON AN AGREED UPON SERVICE DATE AND DO NOT RECEIVE THE FREE REMEDY WITHIN A REASONABLE TIME SHOULD CONTACT CHEVROLET AT 1-800-222-1020, PONTIAC AT 1-800-762-2737, OLDSMOBILE AT 1-800-442-6537, OR SATURN AT 1-800-553-6000, PROMPT #3.
Model-level recall history does not show whether a particular VIN is affected or has received a repair. Check a VIN with NHTSA ↗
NHTSA investigations
1EA02030 · Engine Compartment Fires
Opened Oct 22, 2002 · Closed Mar 9, 2004
Status: closed (inferred from source dates) · Fuel System, Gasoline; Fuel System, Gasoline:delivery; Fuel System, Gasoline:delivery:hoses, Lines/piping, And Fittings
EA02-030 IS CLOSED WITH GMEA02-030 IS CLOSED WITH GM?S ACTIONS IN 03V-473 AND 04V-090 RECALLING APPROXIMATELY 529,000 MY 1998-99 C- AND H-BODY VEHICLES EQUIPPED WITH DEFECTIVE FUEL PRESSURE REGULATORS.THESE VEHICLES WERE EQUIPPED WITH PLASTIC INTAKE MANIFOLDS THAT ARE UNABLE TO CONTAIN PRESSURES THAT OCCUR IN SOME BACKFIRE EVENTS AND DEFECTIVE FUEL PRESSURE REGULATORS WITH LEAKING DIAPHRAGMS THAT CAN PROVIDE A SOURCE OF FUEL TO PRODUCE A COMBUSTIBLE AIR-FUEL MIXTURE IN THE MANIFOLD.THE CLOSING OF THIS INVESTIGATION DOES NOT CONSTITUTE A FINDING BY ODI THAT NO SAFETY DEFECT EXISTS IN THE VEHICLES THAT ARE NOT INCLUDED IN GM?S RECALLS.ODI WILL CONTINUE TO MONITOR THE INCIDENCE OF MANIFOLD RUPTURES AND RELATED FIRES IN OTHER MY 1995-2002 GM PASSENGER CARS EQUIPPED WITH THE SUBJECT INTAKE MANIFOLD.FOR ADDITIONAL INFORMATION, SEE THE ATTACHED CLOSING REPORT.
Additional source detail variants (3)
Fuel System, Gasoline:delivery
EA02-030 IS CLOSED WITH GMEA02-030 IS CLOSED WITH GM?S ACTIONS IN 03V-473 AND 04V-090 RECALLING APPROXIMATELY 529,000 MY 1998-99 C- AND H-BODY VEHICLES EQUIPPED WITH DEFECTIVE FUEL PRESSURE REGULATORS.THESE VEHICLES WERE EQUIPPED WITH PLASTIC INTAKE MANIFOLDS THAT ARE UNABLE TO CONTAIN PRESSURES THAT OCCUR IN SOME BACKFIRE EVENTS AND DEFECTIVE FUEL PRESSURE REGULATORS WITH LEAKING DIAPHRAGMS THAT CAN PROVIDE A SOURCE OF FUEL TO PRODUCE A COMBUSTIBLE AIR-FUEL MIXTURE IN THE MANIFOLD.THE CLOSING OF THIS INVESTIGATION DOES NOT CONSTITUTE A FINDING BY ODI THAT NO SAFETY DEFECT EXISTS IN THE VEHICLES THAT ARE NOT INCLUDED IN GM?S RECALLS.ODI WILL CONTINUE TO MONITOR THE INCIDENCE OF MANIFOLD RUPTURES AND RELATED FIRES IN OTHER MY 1995-2002 GM PASSENGER CARS EQUIPPED WITH THE SUBJECT INTAKE MANIFOLD.FOR ADDITIONAL INFORMATION, SEE THE ATTACHED CLOSING REPORT.
Fuel System, Gasoline:delivery:hoses, Lines/piping, And Fittings
EA02-030 IS CLOSED WITH GMEA02-030 IS CLOSED WITH GM?S ACTIONS IN 03V-473 AND 04V-090 RECALLING APPROXIMATELY 529,000 MY 1998-99 C- AND H-BODY VEHICLES EQUIPPED WITH DEFECTIVE FUEL PRESSURE REGULATORS.THESE VEHICLES WERE EQUIPPED WITH PLASTIC INTAKE MANIFOLDS THAT ARE UNABLE TO CONTAIN PRESSURES THAT OCCUR IN SOME BACKFIRE EVENTS AND DEFECTIVE FUEL PRESSURE REGULATORS WITH LEAKING DIAPHRAGMS THAT CAN PROVIDE A SOURCE OF FUEL TO PRODUCE A COMBUSTIBLE AIR-FUEL MIXTURE IN THE MANIFOLD.THE CLOSING OF THIS INVESTIGATION DOES NOT CONSTITUTE A FINDING BY ODI THAT NO SAFETY DEFECT EXISTS IN THE VEHICLES THAT ARE NOT INCLUDED IN GM?S RECALLS.ODI WILL CONTINUE TO MONITOR THE INCIDENCE OF MANIFOLD RUPTURES AND RELATED FIRES IN OTHER MY 1995-2002 GM PASSENGER CARS EQUIPPED WITH THE SUBJECT INTAKE MANIFOLD.FOR ADDITIONAL INFORMATION, SEE THE ATTACHED CLOSING REPORT.
Fuel System, Gasoline
EA02-030 IS CLOSED WITH GMEA02-030 IS CLOSED WITH GM?S ACTIONS IN 03V-473 AND 04V-090 RECALLING APPROXIMATELY 529,000 MY 1998-99 C- AND H-BODY VEHICLES EQUIPPED WITH DEFECTIVE FUEL PRESSURE REGULATORS.THESE VEHICLES WERE EQUIPPED WITH PLASTIC INTAKE MANIFOLDS THAT ARE UNABLE TO CONTAIN PRESSURES THAT OCCUR IN SOME BACKFIRE EVENTS AND DEFECTIVE FUEL PRESSURE REGULATORS WITH LEAKING DIAPHRAGMS THAT CAN PROVIDE A SOURCE OF FUEL TO PRODUCE A COMBUSTIBLE AIR-FUEL MIXTURE IN THE MANIFOLD.THE CLOSING OF THIS INVESTIGATION DOES NOT CONSTITUTE A FINDING BY ODI THAT NO SAFETY DEFECT EXISTS IN THE VEHICLES THAT ARE NOT INCLUDED IN GM?S RECALLS.ODI WILL CONTINUE TO MONITOR THE INCIDENCE OF MANIFOLD RUPTURES AND RELATED FIRES IN OTHER MY 1995-2002 GM PASSENGER CARS EQUIPPED WITH THE SUBJECT INTAKE MANIFOLD.FOR ADDITIONAL INFORMATION, SEE THE ATTACHED CLOSING REPORT.