The 1991 Pontiac Sunbird has no open NHTSA recalls. Owners report 6 recurring issue clusters, led by “Seat belt buckle, latch and restraint failures.” 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.
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.
What drivers and federal regulators have officially reported about the 1991 Pontiac Sunbird.
SEAT BELTS
6 NHTSA complaints · 1994-11 → 1997-02
“VEHICLE WAS INVOLVED IN AN ACCIDENT, SEAT BELT BUCKLE BROKE DURING ACCIDENT”
“THE DRIVER SIDE SEAT BELT LATCH, THE PLASTIC COVER BROKE AND CAUSING THE RELEASE BUTTON TO BE EXPOSED AND THE BELT TO BECOME UNLATCHED”
“SHOULDER PORTION OF SEAT/LAP BELT FAILED TO RESTRAIN UPPER PORTION OF OWNER'S BODY, ALLOWING CONTACT WITH STEERING WHEEL”
SERVICE BRAKES, HYDRAULIC
3 NHTSA complaints · 1995-02 → 1997-11
“WHILE DRIVING, MADE ATTEMPT TO STOP BRAKE PEDAL WENT TO FLOOR, EXPERIENCING EXCESSIVE PREMATURE WEAR TO PADS, WITHOUT PRIOR WARNING, HAS REPLACED PADS SIX TIMES”
“DRIVERS SIDE FRONT CALIPERS WORE OUT, CAUSING ACCIDENT”
“BRAKES DID NOT SEEM TO STOP VEHICLE WITHIN A REASONABLE DISTANCE AND HAD A SOFT PEDAL”
ENGINE AND ENGINE COOLING
5 NHTSA complaints · 1997-05 → 1999-04
“CONSUMER EXPERIENCED COMPLETE FAILURE OF ENGINE COOLING SYSTEM,CAUSING THE VEHCILE TO SHUTDOWN WHICH COULD HAVE RESULTED IN AN ACCIDENT”
“ENGINE HEAD GASKET CRACKED, CAUSING THE OIL AND THE COOLANT TO MIX TOGETHER AND LEAK, MAY HAVE CAUSED FIRE OR ENGINE DAMAGES”
“THE ENGINE HAS A MALFUNCTION THAT CAUSES THE CAR TO NOT ACCELERATE VERY FAST. DEALER REPLACED FIRST ENGINE, AND NOW THE SECOND IS MALFUNCTIONING”
VEHICLE SPEED CONTROL
5 NHTSA complaints · 1995-08 → 1999-09
“HAD VEHICLE IN REVERSE & BACKING OUT OF PARKING LOT. THE THROTTLE STUCK & VEHICLE TOOK OFF”
“WHEN STARTING THE CAR THE ENGINE REVVED AND THE ACCELERATOR PEDAL JAMMED WHILE IN REVERSE AND THE CAR HIT ANOTHER VEHICLE”
“WHILE APPLYING THE BRAKES THE VEHICLE SUDDEN ACCELERATED. THIS HAPPENED SEVERAL TIMES”
LATCHES/LOCKS/LINKAGES
3 NHTSA complaints · 1995-07 → 1997-08
“THE HOOD LATCH FAILED AND THE HOOD FLEW OFF OF VEHICLE WHILE TRAVELING 55 MILES PER HOUR”
“HOOD LATCH UNFASTENED, CAUSING HOOD TO FLY BACK/INJURIES”
“DOORS COME OPEN AT HIGHWAY SPEED WITHOUT PRESSURE BEING APPLIED TO THEM”
ELECTRICAL SYSTEM
3 NHTSA complaints · 1995-07 → 1997-07
“WHILE DRIVING AT 30MPH THE VEHICLE CAUGHT ON FIRE UNDER THE DASHBOARD, BEGAN AT WIRING HARNESS”
“ENGINE COMPARTMENT FIRE UNDER THE HOOD, VEHICLE HAD BEEN DRIVEN AND PARKED, WILL PROVIDE MORE INFORMATION”
“ENGINE COMPARTMENT FIRE. (OHIO STATE POLICE REPORT)”
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.
Critical for safety and preventing major damage
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.
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.
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.
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.
Keeps your vehicle running smoothly and efficiently
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.
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.
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.
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.
Extends the life of your vehicle and improves comfort
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.
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.
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 1991 Pontiac Sunbird 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.