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2003 Pontiac Montana Recalls, Problems & Maintenance

The 2003 Pontiac Montana has no open NHTSA recalls. Owners report 8 recurring issue clusters, led by “Fuel tank and filler neck gasoline leak.” 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 2003 Pontiac Montana.

Reported to NHTSA

Fuel tank and filler neck gasoline leak

FUEL SYSTEM, GASOLINE

12 NHTSA complaints · 2003-10 → 2016-04

“FUEL TANK LEAKS SEVERE WHERE FILLER TUBE ENTERS THE FUEL TANK”
— Owner report, NHTSA ODI #10454609
“I NOTICED A STRONG SMELL OF GASOLINE AFTER FILLING THE TANK. THERE WAS A LARGE PUDDLE OF GAS UNDER THE VEHICLE WITH FUEL DRIPPING FROM THE GAS TANK NEAR THE FILLER NECK”
— Owner report, NHTSA ODI #10154600
“CONSUMER STATED THAT WHILE TRAVELING IN NEW VAN FILLED IT UP WITH GAS, AND WOKE UP THE NEXT MORNING AND GAS WAS LEAKING ALL OVER THE PLACE. CONSUMER TOOK VEHICLE TO THE DEALER, WHO FOUND THAT FUEL TANK WAS CRACKED, CAUSING GAS TO LEAK”
— Owner report, NHTSA ODI #10044051

Read all complaints on NHTSA →

Intake manifold gasket coolant leak

ENGINE AND ENGINE COOLING

6 NHTSA complaints · 2005-03 → 2009-04

“INTAKE MANIFOLD LEAKING AT 60,000 MILES. DEALER WILL NOT DO ANYTHING ABOUT IT”
— Owner report, NHTSA ODI #10201961
“THIS IS MY SECOND PONTIAC MINI VAN WITH A LEAKING INTAKE MANIFOLD GASKET. THE 1994 STARTED LEAKING AT 60K MILES,MY CURRENT VAN A 2003 IS LEAKING AT 45K MILES”
— Owner report, NHTSA ODI #10156475
“PROBLEM WITH LOWER INTAKE MANIFOLD THAT HAS TO BE REPLACED DUE TO BAD DEXCOOL. DEALERSHIP WILL NOT COVER REPAIR FOR VEHICLE”
— Owner report, NHTSA ODI #10255154

Read all complaints on NHTSA →

Rocker arm bolt and valve train failure

ENGINE AND ENGINE COOLING

5 NHTSA complaints · 2006-12 → 2009-04

“AFTER SERVICE WORK WAS PERFORMED TO DIAGNOSE THE PROBLEM IT WAS FOUND OUT THAT TWO BOLTS THAT HOLD THE ROCKER ARM ASSEMBLY ON FOR CYLINDER #3 WERE IN FACT STRIPPED AND FELL OUT OF THE ENGINE HEAD”
— Owner report, NHTSA ODI #10175727
“THE MECHANIC STATED THAT IT WAS MISSING A CYLINDER AND THE ENGINE WAS LOOSE. THE ROCKER BOLT FELL OFF OF THE HEAD OF THE ROCKER ARM AND THE HEAD HAD TO BE REPLACED”
— Owner report, NHTSA ODI #10201129
“THE VALVE PULLED OUT OF ROCKER ARM MID 2008 ON #2 CAL COSTING APPROX 600.00 REPAIR AGAIN IN 2009 THE #3 CYL VALVE PULLED OUT EFFECTING ANOTHER REPAIR”
— Owner report, NHTSA ODI #10266493

Read all complaints on NHTSA →

Power sliding door closing on occupants

STRUCTURE

5 NHTSA complaints · 2004-05 → 2010-03

“THE DOOR SLIDES BACK INTO PLACE WHEN THE BUTTON IS PUSHED. IT IS SUPPOSE TO GO BACK TO AN OPEN POSITION WHEN THE DOOR TOUCHES A PERSON OR AN OBJECT”
— Owner report, NHTSA ODI #10156402
“THE PASSENGER AUTO DOOR CONTINUES CLOSING WHEN OBJECTS OR PERSONS ARE IN ITS PATH”
— Owner report, NHTSA ODI #10151415
“THE AUTOMATIC DOOR ON OUR 2003 MONTANA MINIVAN COMPLETELY CLOSED ON MY 4 YEAR OLD DAUGHTERS HAND YESTERDAY, BREAKING HER FINGER AND CAUSING BRUSING AND SWELLING”
— Owner report, NHTSA ODI #10073226

Read all complaints on NHTSA →

Headlight moisture and brake light bulb burnout

EXTERIOR LIGHTING

11 NHTSA complaints · 2006-11 → 2015-01

“FRONT HEADLIGHT HAD LOTS OF MOISTURE ON THE INTERIOR, WHICH CAUSED THE BULB TO BURN OUT. I NEEDED TO REPLACE THE ENTIRE HEADLIGHT UNIT, A $240 PART”
— Owner report, NHTSA ODI #10292543
“HEAD LIGHTS FILL UP WITH MOISTURE AND BLOWS HEADLIGHT BULBS OUT WHILE DRIVING”
— Owner report, NHTSA ODI #10291811
“BRAKE LIGHT BULBS CONTINUALLY BURN OUT. THE BOTTOM OF THE BULBS ARE MELTED WHEN REMOVED”
— Owner report, NHTSA ODI #10174272

Read all complaints on NHTSA →

Air bag deployment without a collision

AIR BAGS

4 NHTSA complaints · 2007-10 → 2015-01

“A 2003 PONTIAC MONTANA WAS IN A PARKING LOT. PEOPLE SITTING IN DRIVER'S SEAT AND FRONT PASSENGER SEAT. THE IGNITION WAS ON BUT THE CAR WAS STILL IN PARK. WITHOUT ANY WARNING, BOTH SIDE AIR BAGS DEPLOYED, CAUSING SOFT TISSUE INJURY TO DRIVER'S LEFT LOWER RIB CAGE”
— Owner report, NHTSA ODI #10361651
“THEN REALIZED THAT BOTH SIDE AIRBAGS HAD DEPLOYED. I SHUT THE ENGINE OFF WONDERING IF SOMEONE HIT ME IN PARKING LOT BUT THAT WAS NOT THE CASE. THEY DEPLOYED FOR NO REASON”
— Owner report, NHTSA ODI #10453728
“BOTH SIDE CURTAIN AIRBAGS(INSIDE SEAT) DEPLOYED WITHOUT A VEHICLE ACCIDENT OR COLLISION.. BOTH MY WIFE AND I WERE STRUCK WITH THE AIRBAGS”
— Owner report, NHTSA ODI #10670171

Read all complaints on NHTSA →

Air bags not deploying in a crash

AIR BAGS

5 NHTSA complaints · 2004-03 → 2022-05

“2004 PONTIAC MONTANA ROLLED OVER TWICE IN A VERY SERIOUS ACCIDENT IN ATLANTA, GEORGIA. IT WAS HIT FROM THE PASSENGER'S SIDE BY ANOTHER CAR. NO AIRBAGS, FRONT OR SIDE, DEPLOYED”
— Owner report, NHTSA ODI #10065831
“DURING A VEHICLE COLLISION/ROLL OVER AT 55 MPH FRONT AIR BAGS DID NOT DEPLOY. CONSUMER SUSTAINED MINOR FACE INJURIES”
— Owner report, NHTSA ODI #10064602
“I ENDED UP HITTING THE STEERING WHEEL WITH MY CHEST. NOT ONLY WAS MY SEATBELT INEFFECTIVE, BUT THE AIRBAG DID NOT OPEN”
— Owner report, NHTSA ODI #11150848

Read all complaints on NHTSA →

Engine stall with loss of power while driving

ELECTRICAL SYSTEM

4 NHTSA complaints · 2003-12 → 2008-11

“2003 PONTIAC MONTANA STALLED WHILE DRIVING. THE VEHICLE LOST ALL POWER INCLUDING STEERING AND BRAKES”
— Owner report, NHTSA ODI #10049103
“MONTANA KEEPS CUTTING OFF WITHOUT A WARNING AND IT WILL STOP DEAD IN TRAFFICE WITH OUT A WARNING”
— Owner report, NHTSA ODI #10068314
“WHILE DRIVING APPROXIMATELY 5-10 MPH, THE VEHICLE STALLED AND LOST ALL POWER”
— Owner report, NHTSA ODI #10249816

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.

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 Montana 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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