The 2003 Pontiac Grand Prix has no open NHTSA recalls. Owners report 7 recurring issue clusters, led by “Engine gasket and oil leaks.” 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 2003 Pontiac Grand Prix.
ENGINE AND ENGINE COOLING
13 NHTSA complaints · 2004-12 → 2019-04
“THE CONTACT STATED THAT OIL WAS DRIPPING INTO THE RADIATOR AND CAUSED THE VEHICLE TO SHAKE VIOLENTLY WITHOUT WARNING”
“I PURCHASED A 2003 PONTIAC GRAND PRIX ON 9/19/03 WITH 12429 MILES ON THE 3100 SFI 6 CYL ENGINE, AND NOW AT 65,550 MILES, THE MANIFOLD GASKET IS LEAKING AND FILLING THE RADIATOR WITH OIL”
“3.1L INTAKE MANIFOLD GASKET LEAK”
ELECTRICAL SYSTEM
11 NHTSA complaints · 2010-06 → 2016-04
“I HAVE A 2003 GRAND PRIX SE AND EVERYTIME I TURN MY AC/HEATER ON MY HEADLIGHTS GO OFF, ITS 80+ DEGREES IN THE SUMMER TIME”
“WHEN I TURN ON THE BLOWER SWITCH, THE BLOWER DOESN'T WORK AND THE HEADLIGHTS GO OUT”
“THE CONTACT WAS ABLE TO REMOVE THE KEY FROM THE IGNITION WHILE THE VEHICLE WAS STARTED; HOWEVER, THE VEHICLE COULD NOT BE TURNED OFF WITH THE KEY IN THE IGNITION”
POWER TRAIN
3 NHTSA complaints · 2009-04 → 2011-06
“I BOUGHT A 2003 GRAND PRIX WITH IN THE FIRST YEAR I HAD TO REPLACE THE TRANSMISSION THEY CHARGED ME 1300.00”
“ALSO THE TRANSMISSION SHIFTS HARD OCCASIONALLY WHEN GOING FROM FIRST TO SECOND GEAR”
“THEN AT 68000 MILES THE TRANSMISSION WAS SLIPPING AND HAD TO BE REBUILT AT A COST OF $3000.00 (SEVERAL PART ALONG WITH TORQUE CONVERTER)”
ENGINE
35 NHTSA complaints · 2007-03 → 2026-05
“WHILE DRIVING APPROXIMATELY 55 MPH, MASSIVE FLAMES IGNITED FROM UNDERNEATH THE HOOD OF THE VEHICLE”
“THE ENGINE OIL DRIPPED INTO THE MANIFOLD AND CAUGHT FIRE. THE CAR IS TOTALED NOW”
“THE VEHICLE WAS TOWED TO THE DEALER WHERE IT WAS DIAGNOSED THAT OIL WAS DRIPPING ONTO THE EXHAUST MANIFOLD”
VEHICLE SPEED CONTROL
4 NHTSA complaints · 2005-05 → 2017-09
“WHILE DRIVING APPROXIMATELY 25 MPH, THE ACCELERATOR PEDAL WAS DEPRESSED AND BECAME STUCK”
“WHILE DRIVING OVER 55 MPH, THE ACCELERATOR PEDAL WOULD ERRONEOUSLY DEPRESS, CAUSING THE SPEED TO INCREASE”
“WHILE DRIVING APPROXIMATELY 30 MPH, THE DRIVER ATTEMPTED TO APPLY THE BRAKES, BUT THE VEHICLE ACCELERATED INSTEAD”
SERVICE BRAKES, HYDRAULIC
8 NHTSA complaints · 2002-04 → 2015-12
“THE CONTACT STATED THAT WHILE DRIVING 35 MPH, THE BRAKES FAILED TO RESPOND WITHOUT WARNING”
“DURING WET WEATHER THE BRAKES ON A 2003 PONTIAC GRAND PRIX REFUSED TO ENGAGE”
“THE CONTACT STATED THAT THE ABS AND TRAC WARNING LAMPS ILLUMINATED”
SEATS
3 NHTSA complaints · 2005-06 → 2013-02
“I NOTICED WHEN I ENTERED THE VEHICLE TO START IT UP THAT THE DRIVER SEAT WAS EXTREMELY WARM WHICH WAS STRANGE BECAUSE THE CAR SAT OVERNIGHT AND IT IS WINTER”
“THE CONSUMER SUFFERED A BURN INJURY FROM THE CAR SEAT HEATER IN THE 2003 PONTIAC GRAND PRIX”
“2003 PONTIAC GRAND PRIX CAR SEAT HEATER MALFUNCTIONED”
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.
Occupant deaths in fatal crashes (FARS)
150 crashes 1990–2024
How the 150 occupant deaths break down
105
driver deaths
44
passenger deaths
1
not recorded by seat
150
occupant deaths
Crash years covered: 1990–2024 This model year first appears in 2002 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.
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.
6
complaints mentioning a crash
38
complaints mentioning a fire
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 2003 Pontiac Grand Prix 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.