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1998 Pontiac Bonneville Recalls, Problems & Maintenance

The 1998 Pontiac Bonneville has no open NHTSA recalls. Owners report 5 recurring issue clusters, led by “Coolant leaking into engine from intake manifold.” Every Pontiac is now 15+ years old, which changes the maintenance question from 'what mileage?' to 'how old is it?' — hoses, belts, coolant, and brake fluid age out even on low-mile cars. The G6 uses GM's Oil Life System (change oil when the message appears, at most every 12 months) with Dex-Cool coolant and either the 2.4L Ecotec four or the 3.5/3.9L pushrod V6. Parts remain cheap and plentiful through GM's shared platforms — these cars are inexpensive to keep healthy if the age-based items aren't ignored.

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No open recalls on file. NHTSA lists no unrepaired safety recalls for this year, make and model. A recall can be issued at any time, and a specific car can still have one open — check yours by VIN at nhtsa.gov/recalls.

Known issues & problems for this vehicle

What drivers and federal regulators have officially reported about the 1998 Pontiac Bonneville.

Reported to NHTSA

Coolant leaking into engine from intake manifold

ENGINE AND ENGINE COOLING

75 NHTSA complaints · 2002-07 → 2013-04

“MY UPPER INTAKE MANIFOLD LEAKS ENGINE COOLANT INTO THE COMBUSTION CHAMBERS AND INTO THE CRANKCASE. THE EGR TUBE MELTS THE UPPER PLASTIC MANIFOLD I HAVE HAD THE UPPER AND LOWER INTAKE REPLACED FOR THIS ISSUE ONCE BEFORE WITH GM PARTS AND IT HAPPENING AGAIN. IF IT NOT”
— Owner report, NHTSA ODI #10351151
“UPPER INTAKE MANIFOLD DEVELOPED A COOLANT LEAK INTO CYLINDERS. ON STARTUP, THE ENGINE HYDROLOCKED. WHEN ENGINE HYDROLOCKED, THE STARTER WAS DAMAGED AND HAD TO BE REPLACED. THE INTAKE MANIFOLD AND SPARK PLUGS HAD TO BE REPLACED. THE DEALERSHIP SAID THIS IS A COMMON”
— Owner report, NHTSA ODI #10098867
“THE CHECK ENGINE LIGHT CAME ON AND MY ENGINE LOCKED UP AND RADIATOR FLUID WAS COMING OUT OF THE HEAD GASKETS ON THE ENGINE WITH NO PRIOR WARNING. THIS IS THE SECOND TIME WITHIN 4 YEARS THAT THIS HAS HAPPENED WITH THIS CAR. *JB”
— Owner report, NHTSA ODI #10143316

Read all complaints on NHTSA →

Cracked or failed upper intake manifold

ENGINE AND ENGINE COOLING

42 NHTSA complaints · 2002-07 → 2011-06

“FOR THE SECOND TIME IN ABOUT 2 YEARS MY 98 BONNEVILLE HAD THE PLENUM CRACK WHILE SIMPLY DRIVING AT NORMAL SPEEDS. THIS ALLOWS WATER TO ENTER TOP OF MOTOR WHICH REQUIRES VEHICLE TO BE SHUT OFF IMMEDIATELY OR MOTOR WILL OVERHEAT UNTIL IT IS RUINED. THE CAR HAD ABOUT”
— Owner report, NHTSA ODI #10116418
“WHILE DRIVING AT ANY SPEED VEHICLE WAS RUNNING ROUGH. IT WAS TAKEN TO A REPAIR SHOP, AND MECHANIC DETERMINED THAT THE PROBLEM WAS A CRACK IN THE INTAKE MANIFOLD. CONSUMER WAS CONCERNED THAT THIS WAS THE SECOND INTAKE MANIFOLD REPLACED WITHIN TWO YEARS. THE MANUFACTURER”
— Owner report, NHTSA ODI #10103356
“THE INTAKE MANIFOLD GASKET (PLENUM) FAILED COSTING ME $2000 IN REPAIRS. THE GASKET HAD BEEN MADE OF A FAULTY PLASTIC BY GM IN TRYING TO CUT MANUFACTURING COSTS. THE CAR IS A 1998 PONTIAC BONNEVILLE. I PURCHASE IT WITH 49,000 MILES IN 2003 AND IT CUREENTLY HAS 62,000”
— Owner report, NHTSA ODI #10120911

Read all complaints on NHTSA →

Fuel pressure regulator recall reimbursement

FUEL SYSTEM, GASOLINE

19 NHTSA complaints · 2003-09 → 2008-01

“'RECALL CAMPAIGN' CONCERNING 19998 PONTIAC BONNEVILLE FUEL PRESSURE REGULATOR. *BF THE CONSUMER HAD THE FUEL PRESSURE REGULATOR REPLACED PRIOR TO THE RECALL BEING ISSUED BECAUSE THE ENGINE CAUGHT ON FIRE. THE CONSUMER SUBMITTED THE REQUEST FOR REIMBURSEMENT, HOWEVER HE”
— Owner report, NHTSA ODI #10113442
“INTAKE MANIFOLD AND FUEL PRESSURE REGULATOR FAILURE. *BF THE RECALLED COMPONENT FAILED PRIOR TO NOTIFICATION. THE CONSUEMR PAID TO HAVE THE VEHICLE REPAIRED. AFTER RECEIVING THE RECALL THE CONSUMER REQUESTED REIMBURSEMENT BUT WAS ONLY OFFERED A PARTIAL REFUND. *NM”
— Owner report, NHTSA ODI #10097459
“CONSUMER DISAPPOINTED WITH REIMBURSEMENT FOR 1998 PONTIAC BONNEVILLE. THE FUEL PRESSURE REGULATOR WAS REPLACED. *BF RECALL CAMPAIGN: 04V090000. THE RECALL IS RELATED TO THE FUEL PRESSURE REGULATOR LEAK. THE TEMPERATURE GAUGE WAS FLUCTUATING WHILE THE VEHICLE WAS BEING”
— Owner report, NHTSA ODI #10111695

Read all complaints on NHTSA →

Engine compartment fire or explosion

ENGINE AND ENGINE COOLING

20 NHTSA complaints · 2003-01 → 2015-09

“CONSUMER STARTED THE VEHICLE, WENT INTO THE HOUSE TO LET THE VEHICLE WARM, UPON RETURNING THE VEHICLE WAS ON FIRE. RECENTLY A RECALL 04V090000 WAS RECEIVED INDICATING A POSSIBLE FIRE. *AK”
— Owner report, NHTSA ODI #10087849
“CONSUMER HEARD A LOUD BANG WHILE DRIVING ON THE HIGHWAY. HE PROCEEDED OFF THE HIGHWAY, OPENED THE HOOD OF THE VEHICLE, AND FIRE STARTED IN THE ENGINE COMPARTMENT, WHICH ENGULFED INTO FLAMES. WITHIN SECONDS CONSUMER CALLED THE FIRE DEPARTMENT, WHO INDICATED THAT THE”
— Owner report, NHTSA ODI #10090009
“THE FUEL PRESSURE REGULATOR LEAKED GASOLINE; ALLOWING FUEL TO ENTER THE INTAKE MANIFOLD THROUGH A VACUUM LINE. A SPARK IGNITED THE EXCESS FUEL CAUSING AN EXPLOSION AND RUPTURING THE MANIFOLD. THE BLAST HIT THE CAR IN FRONT OF ME SO HARD THEY THOUGHT THEY HAD BEEN”
— Owner report, NHTSA ODI #10056533

Read all complaints on NHTSA →

Engine stalling while driving

ENGINE

7 NHTSA complaints · 2002-09 → 2014-07

“TL* THE CONTACT OWNS A 1998 PONTIAC BONNEVILLE. THE CONTACT STATED THAT WHILE DRIVING 65 MPH, THE VEHICLE STALLED WITHOUT WARNING. THE CONTACT WAS ABLE TO RESTART THE VEHICLE AND IT WAS TAKEN TO A DEALER. THE TECHNICIAN DIAGNOSED THAT THE ENGINE NEEDED TO BE REPLACED”
— Owner report, NHTSA ODI #10557467
“I WAS DRIVING ON THE NEW YORK THRUWAY AND ALL OF A SUDDEN, MY CAR SHUT OFF. I HAD TO POWER STEER, NO POWER BRAKES, THE FUEL GAUGE READ NO FUEL AND THE BELLS WENT OFF. I HAD TO TRY TO GET TO A SAFE PLACE AND RESTART MY CAR. THIS HAS HAPPENED MANY MORE TIMES. I CAN BE”
— Owner report, NHTSA ODI #10608590
“WHILE DRIVING VEHICLE STALLED. VEHICLE SHUT DOWN, AND WAS TOWED. THE INTAKE MANIFOLD WAS FOUND TO BE DEFECTIVE.*AK”
— Owner report, NHTSA ODI #10095065

Read all complaints on NHTSA →

Issues on other model years

Source: NHTSA Office of Defects Investigation (ODI). Complaint data refreshed Sep 20, 2026. Investigation data refreshed Sep 20, 2026.

We display NHTSA's record with attribution; we don't editorialize on what these complaints mean for any specific vehicle.

Raw data + downloads for this vehicle →

Essential maintenance

Critical for safety and preventing major damage

Engine Oil & Filter (Oil Life System)

Every 5,000 mi

Change when the Oil Life System calls it, and at least every 12 months. On engines this age, many mechanics suggest a practical 5,000-mile ceiling — aging seals and PCV systems contaminate oil faster.

Estimated cost — typical U.S. ranges

Dealer

~$120–$160

Shop

~$85–$115

DIY

~$25–$55

Full synthetic costs more than conventional. 5-quart 0W-20 + filter is the typical bill.

Tire Rotation

Every 7,500 mi

Rotate every 7,500 miles. Check tire date codes too — sidewall age (6+ years) retires tires on old cars before tread wear does.

Estimated cost — typical U.S. ranges

Dealer

~$85

Shop

~$60

DIY

Free

Often free at the shop where you bought the tires — worth asking before paying.

Brake Inspection

Every 7,500 mi

Inspect pads, rotors, and especially brake hoses and hard lines at every service — line corrosion is a real failure mode on 15-year-old northern cars.

Estimated cost — typical U.S. ranges

Dealer

~$85

Shop

~$60

DIY

Free

Most shops do this free as a courtesy with any service. Don't pay separately if you can avoid it.

Brake Fluid

Every 24,000 mi

Replace every 2 years. Decade-old fluid is the hidden cause of soft pedals and seized calipers on aging GM sedans.

Estimated cost — typical U.S. ranges

Dealer

~$180–$200

Shop

~$125–$140

DIY

~$10–$25

DOT 3 or 4 — match the cap. Vacuum bleeders make this a one-person DIY.

Important maintenance

Keeps your vehicle running smoothly and efficiently

Automatic Transmission Fluid (4T45-E / 4T65-E)

Every 45,000 mi

Drain-and-fill every 45,000 miles with Dexron VI. On high-mile units that have never been serviced, prefer repeated drain-and-fills over a pressure flush.

Estimated cost — typical U.S. ranges

Dealer

~$330–$500

Shop

~$235–$355

DIY

~$60–$180

Some sealed transmissions have no dipstick — fill is precise and best left to a shop. Many drivers can still DIY drain-and-fill.

Spark Plugs

Every 100,000 mi

Iridium plugs at 100,000 miles on the G6's engines. Replace wires/boots on the pushrod V6 at the same time — they're brittle at this age.

Estimated cost — typical U.S. ranges

Dealer

~$285–$390

Shop

~$200–$275

DIY

~$25–$100

Iridium plugs cost more but last 100k+ miles. V6/V8 access varies wildly — some are tough.

Serpentine Belt & Tensioner

Every 60,000 mi

At this age, replace the belt AND tensioner as a pair on any evidence of cracking or noise — a weak tensioner eats new belts.

Estimated cost — typical U.S. ranges

Dealer

~$195–$235

Shop

~$135–$165

DIY

~$20–$50

DIY-friendly if you can reach the tensioner. Inspect for cracks rather than swap on a strict mileage interval.

Engine Air Filter

Every 30,000 mi

Replace every 30,000 miles — a cheap, 5-minute job on the G6.

Estimated cost — typical U.S. ranges

Dealer

~$60–$95

Shop

~$45–$70

DIY

~$15–$40

5-minute job on most cars; the airbox lid usually has clips, no tools needed.

Recommended maintenance

Extends the life of your vehicle and improves comfort

Coolant Replacement (Dex-Cool)

Every 100,000 mi

Dex-Cool is rated 5 years / 150,000 miles — but on cars this old the interval is effectively 'every 5 years.' Check for intake and water-pump seepage while it's drained; use Dex-Cool only, never mixed with green coolant.

Estimated cost — typical U.S. ranges

Dealer

~$285–$330

Shop

~$200–$235

DIY

~$25–$60

Use the manufacturer-specified coolant — wrong color/chemistry can damage the cooling system.

Battery & Charging System Test

Every 25,000 mi

Test the battery and alternator annually. Parasitic drains from aging body modules are common on this era of GM — a healthy battery masks them until it doesn't.

Estimated cost — typical U.S. ranges

Dealer

~$225–$390

Shop

~$160–$280

DIY

~$130–$250

Most auto-parts stores test and install batteries free with purchase. Skip the dealer markup.

Fatal crash history & reported problems

Occupant deaths in fatal crashes (FARS)

129 crashes 1990–2024

How the 129 occupant deaths break down

94

driver deaths

35

passenger deaths

129

occupant deaths

Crash years covered: 1990–2024 This model year first appears in 1998 crashes. Older models have had more years on the road to appear in these crashes, so a higher count here does not by itself mean a vehicle is less safe.

FARS counts every occupant death in a fatal crash, whatever the cause — it does not mean the vehicle was at fault or defective. Counts are not adjusted for how many of each vehicle are on the road. How to read this number

FARS 2024 data is an annual report file. NHTSA revises these records when the final file is published, so this count can change.

Why we show driver deaths too

Every vehicle has exactly one driver seat, so driver deaths line up fairly when you compare one model to another. Occupant deaths include passengers, so a three row SUV can show a higher number than a two seat car simply because it carries more people.

Both figures are plain counts, not rates. A rate would need to know how many of each vehicle are on the road, and that registration data is not public, so we do not publish rates or scores of any kind.

IIHS publishes driver death rates using this same driver only idea, paired with a registered vehicle years denominator we do not have. Their rates and these counts answer different questions, so do not read either number here as a safety rating.

Owner-reported problem signals

Separate from the federal fatality data above: complaints owners filed with NHTSA about this year and model. These are reports of problems, unverified, and are counted here only as signals.

12

complaints mentioning a crash

40

complaints mentioning a fire

Reviewed known issues for this vehicle

Typical U.S. ranges. Actual quotes vary by shop, parts choice, and vehicle condition.

How we estimate: Dealer = OEM parts × 1.4 + labor × $165/hr. Shop = parts + labor × $115/hr. DIY = parts only.

This maintenance schedule for the 1998 Pontiac Bonneville reflects Pontiac's published service intervals and the GM Oil Life System system. Your actual service needs may vary based on driving conditions, climate, and vehicle usage. Always consult your owner's manual for model-specific recommendations.

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