The 1999 Buick Regal, built on GM's W-body platform with the 3800 Series II V6 (or supercharged variant), is generally reliable but has a few expensive common failures related to the intake manifold gaskets, transmission issues, and supercharger-specific problems on GS models.
Lower Intake Manifold Gasket Failure (3800 V6)
Common · high severity
Typical onset: 80,000-120,000 mi
Symptoms: Coolant loss with no visible external leaks, White smoke from exhaust on cold starts, Milky oil or oil in coolant reservoir, Overheating or coolant smell from vents
Fix: Replace upper and lower intake manifold gaskets, flush cooling system, change oil. Critical to catch early before coolant dilutes oil and damages bearings. 6-8 hours labor.
Estimated cost: $800-1,400
4T65-E Transmission Failure
Common · high severity
Typical onset: 100,000-150,000 mi
Symptoms: Harsh or delayed 1-2 shift, Slipping between gears under load, Shuddering during lockup around 40-50 mph, Metal shavings in pan during fluid change
Fix: Transmission rebuild or replacement required. The 4T65-E suffers from worn clutches and valve body issues, especially behind the supercharged engine. 8-12 hours for R&R and rebuild.
Estimated cost: $1,800-3,200
Supercharger Coupler Failure (GS Model)
Occasional · medium severity
Typical onset: 90,000-130,000 mi
Symptoms: Loud grinding or rattling noise from front of engine, Loss of power and boost, Rubber debris found in supercharger snout, Check engine light with boost-related codes
Symptoms: Power steering fluid leaking near firewall, Low fluid level requiring frequent top-ups, Whining noise from pump when turning, Stiff steering when cold
Fix: Replace high-pressure power steering hose from pump to rack. Hose degrades where it bends near the engine mount. 1.5-2 hours labor.
Estimated cost: $250-450
Front Hub Bearing Failure
Occasional · medium severity
Typical onset: 90,000-120,000 mi
Symptoms: Humming or growling noise that increases with speed, Noise changes when turning left or right, ABS light may illuminate intermittently, Wheel play detectable when jacked up
Fix: Replace complete hub bearing assembly. Common on W-body cars due to bearing seal design and exposure to road salt. 2-3 hours per side.
Estimated cost: $300-500 per side
Coolant Elbows and Plastic Connector Failures
Common · medium severity
Typical onset: 70,000-110,000 mi
Symptoms: Coolant leaking from plastic elbows at throttle body or heater core, Steam from engine bay, Rapid coolant loss, Overheating in traffic
Fix: Replace brittle plastic coolant elbows and connectors with updated parts or aluminum aftermarket upgrades. Often multiple fail at once. 1-2 hours labor.
Estimated cost: $150-350
Owner tips
Change Dexcool coolant every 3-4 years regardless of mileage — extended intervals cause intake gasket degradation
Service transmission fluid every 50,000 miles with full pan drop and filter change to extend 4T65-E life
Inspect supercharger coupler at 80,000 miles on GS models and upgrade to aftermarket coupler preemptively
Replace all plastic coolant elbows as preventive maintenance around 80,000 miles before they strand you
Solid buy if the intake gaskets and transmission have been serviced — avoid high-mileage examples without service records, especially supercharged GS models with transmission concerns.
AI-assisted summary drawn from NHTSA recall data, our labor-times database, and platform knowledge. Not a substitute for a pre-purchase inspection on a specific vehicle.
Fitment notes: Side post terminals standard for GM vehicles of this era
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Control Modules — 1999 Buick Regal
Every control module on the 1996-2004 Buick Regal — where it lives, replacement time, and what it takes to program a replacement. Modules marked dealer / factory tool won't work after a part swap alone — budget for programming.
Body Control Module (BCM)2.0 hr R&Rdealer / factory tool +0.8 hr▸ programming details
📍 Behind instrument panel, left of steering column above fuse block
🔧 Tech 2 + TIS2000/SPS
⚠️ Controls lighting, door locks, retained accessory power, theft deterrent. VIN and option configuration required.
📍 Center instrument panel, integrated with radio head unit
🔧 Tech 2
⚠️ Theft deterrent radio requires unlock code from VIN. Some models integrate HVAC controls.
Aftermarket tool coverage varies by software version and vehicle build — treat "aftermarket tool" rows as "usually possible" and verify against your tool maker's coverage list before promising a customer. Spot a wrong location or hour? Tell us — corrections ship fast here.
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 · 09V116000
2009-04-08 · EA07008
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: 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.
STEERING · 09E005000
2009-02-17
DORMAN IS RECALLING 979 STEERING KNUCKLES, DORMAN P/NOS. 697-902 AND 697-903, SOLD UNDER DORMAN'S "OE SOLUTIONS<SUP>TM</SUP>" BRAND NAME, AND NAPA P/NOS. 7-8502 AND 7-8503 WHICH WERE SOLD FOR REPLACEMENT USE ON THE VARIOUS VEHICLES LISTED ABOVE. A POTENTIAL MATERIAL OR DESIGN DEFECT COULD RESULT IN THE STEERING KNUCKLE BREAKING IN THE HUB AREA.
Consequence: A BROKEN STEERING KNUCKLE COULD RESULT IN LOSS OF STEERING CONTROL AND A POSSIBLE CRASH WITHOUT WARNING.
Remedy: DORMAN WILL NOTIFY OWNERS AND REPLACE THE DEFECTIVE STEERING KNUCKLES FREE OF CHARGE AND REIMBURSE THE REPAIR FACILITY OR OWNER FOR LABOR. THE RECALL BEGAN ON FEBRUARY 23, 2009. OWNERS MAY CONTACT DORMAN'S TOLL-FREE HOTLINE AT 1-800-523-2492 AND PRESS 5.
STEERING · 08E063000
2008-10-17
DORMAN PRODUCTS IS RECALLING 3,900 INTERMEDIATE STEERING SHAFTS DORMAN PART NOS. 425-151, 425-152, AND 425-153, (SOLD UNDER DORMAN'S "OE SOLUTIONS" BRAND NAME), BALKAMP #'S 7-3057, 7-3058, 7-3059 (SOLD UNDER THE "NAPA" BRAND NAME), AND PLATINUM PARTS #'S 2425151, 2425152, AND 2425153 MANUFACTURED DURING THE MONTH OF SEPTEMBER 2007. THESE REPLACEMENT STEERING SHAFTS CAN BE USED ON THE VEHICLES LISTED ABOVE. THE WELD CONNECTING THE INNER TUBE TO THE OUTER TUBE MAY BE DEFECTIVE.
Consequence: IF THE WELD FAILS, LOSS OF STEERING COULD RESULT, POSSIBLY RESULTING IN A VEHICLE CRASH.
Remedy: DORMAN WILL NOTIFY OWNERS AND REPLACE THE STEERING SHAFTS FREE OF CHARGE. THE RECALL BEGAN ON OCTOBER 16, 2008. OWNERS MAY CONTACT DORMAN TOLL FREE AT 1-800-523-2492.
ENGINE AND ENGINE COOLING · 08V118000
2008-03-12 · EA07008
GM IS RECALLING 207,542 MY 1997-2003 BUICK REGAL AND PONTIAC GRAND PRIX VEHICLES EQUIPPED WITH A 3.8L SUPERCHARGED V-6 ENGINE. THESE VEHICLES HAVE HIGHER FRONT ROCKER COVER GASKET TEMPERATURES, CREATING THE POTENTIAL FOR EARLIER DEGRADATION OF THE FRONT ROCKER COVER GASKET AND EVENTUAL OIL SEEPAGE.
Consequence: CERTAIN UNDERHOOD FIRES MAY BE CAUSED BY DROPS OF ENGINE OIL, FROM SEEPAGE OR SPILLAGE, BEING DEPOSITED ON THE EXHAUST MANIFOLD THROUGH HARD BRAKING. IF THE MANIFOLD IS HOT ENOUGH AND THE OIL RUNS BELOW THE HEAT SHIELD, IT MAY IGNITE INTO A SMALL FLAME AND, IN SOME INSTANCES, THE FIRE MAY SPREAD TO THE PLASTIC SPARK PLUG WIRE CHANNEL AND BEYOND.
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, ALONG WITH THE 1-3-5 SPARK PLUG WIRE RETAINERS, FREE OF CHARGE. THE RECALL IS EXPECTED TO BEGIN DURING MAY 2016. , FREE OF CHARGE. THE RECALL IS EXPECTED TO BEGIN DURING MAY 2016. UNTIL THE REMEDY IS COMPLETED, GM STRONGLY RECOMMENDS THAT OWNERS OBSERVE THE FOLLOWING IMPORTANT PRECAUTIONS (1) THAT OWNERS DO NOT PARK THEIR VEHICLE IN A GARAGE, CAR PORT, OR OTHER STRUCTURE; (2) IF OWNERS NOTICE A BURNING ODOR, THEY SHOULD HAVE THEIR DEALER INSPECT THE VEHICLE. THE DEALER WILL INSPECT THE VEHICLE WITHOUT CHARGE; (3) USE PREMIUM FUEL (91 OCTANE OR HIGHER) IN THE VEHICLE AS RECOMMENDED IN THE VEHICLE'S OWNER MANUAL. OWNERS MAY CONTACT BUICK AT 1-866-608-8080 OR PONTIAC AT 1-800-620-7668, OR THROUGH THEIR WEBSITE AT <A HREF=HTTP://WWW.GMOWNERCENTER.COM>HTTP://WWW.GMOWNERCENTER.COM</A> .
EXTERIOR LIGHTING:HEADLIGHTS · 04V375000
2004-08-10
CERTAIN PASSENGER VEHICLES DO NOT CONFORM TO THE REQUIREMENTS OF FEDERAL MOTOR VEHICLE SAFETY STANDARD NO. 108, "LAMPS, REFLECTIVE DEVICES, AND ASSOCIATED EQUIPMENT." SOME OF THESE VEHICLES DO NOT MEET THE OVERHEAD SIGN ILLUMINATION REQUIREMENTS.
Consequence: LESS ILLUMINATION MAY REDUCE THE ABILITY OF THE DRIVER TO READ OVERHEAD SIGNS WHEN DRIVING AT NIGHT.
Remedy: DEALERS WILL INSTALL NEW LOW BEAM HEADLAMP BULBS IN BOTH OF THE HEADLAMP ASSEMBLIES. THE RECALL BEGAN ON SEPTEMBER 8, 2004. OWNERS SHOULD CONTACT BUICK AT 1-866-608-8080.
NOTE: IF THE BULB NEEDS REPLACEMENT IN THE FUTURE, GM BULB NUMBER 89024715 IS AVAILABLE FROM A DEALER, OR THE EQUIVALENT SYLVANIA BULB IS 9006HP, WITH ORANGE LETTERING ON THE BULB.
EXTERIOR LIGHTING:HEADLIGHTS · 99V356000
1999-12-17
VEHICLE DESCRIPTION: PASSENGER VEHICLES. THESE VEHICLES DO NOT CONFORM TO THE REQUIREMENTS OF FMVSS NO. 108, "LAMPS, REFLECTIVE DEVICES, AND ASSOCIATED EQUIPMENT." THE VERTICAL HEAD LAMP ADJUSTING DEVICE MAY NOT BE CALIBRATED PROPERLY.
Consequence: DRIVER VISIBILITY MAY BE IMPAIRED INCREASING THE RISK OF A CRASH.
Remedy: OWNERS WILL BE PROVIDED WITH AN OWNER'S MANUAL INSERT CONTAINING INSTRUCTIONS FOR OPTICALLY AIMING THE HEADLAMPS.
SERVICE BRAKES, HYDRAULIC:ANTILOCK/TRACTION CONTROL/ELECTRONIC LIMITED SLIP · 99V170000
1999-07-09
SOME OF THESE VEHICLES WITH THE KEY IN THE "ON" POSITION, EXHIBIT A CONDITION IN WHICH THE ANTILOCK BRAKE SYSTEM (ABS) MOTOR SHORTS TO ITS CASE AND GROUNDS THROUGH A FLEXIBLE BRAKE FLUID PIPE.
Consequence: THIS SHORT CAN CAUSE EXTREME HEATING OF THE FLEXIBLE BRAKE PIPE WHERE IT CAN MELT A NEARBY FLEXIBLE PLASTIC FUEL HOSE, WHICH COULD RESULT IN AN UNDERHOOD FIRE.
Remedy: DEALERS WILL INSTALL A GROUND CABLE FROM THE ELECTRONIC BRAKE CONTROL MODULE (EBCM) TO THE ENGINE COMPARTMENT BODY RAIL.
Vehicle Info — 1999 Buick Regal
Performance
Horsepower
200hp
Torque
230lb-ft
Wiper blades
1997-2004 generation (W-body); sedan body style has no rear wiper
Size-standard part numbers — verify your connector type before buying. Rear blades are model-specific; check the package's vehicle list.
Fuel economy figures are EPA data via fueleconomy.gov (median across matching trims). Performance figures are compiled estimates for the 1999 Buick Regal 3.8L V6 and can vary by trim.
🔧 Built by master technician Chris Hackleman · Master Technician · 20+ years.