NHTSA lists 2 safety recalls and 158 owner complaints for the 2004 Buick Rainier. Most complaints involve electrical system (83) and exterior lighting (21). The EPA rates it 15–16 mpg combined.
ON CERTAIN TRUCKS AND SPORT UTILITY VEHICLES, THE DRIVER WISHING TO SIGNAL A TURN BY MOVING THE DIRECTIONAL SIGNAL LEVER, (UP OR DOWN) MAY CAUSE THE FRONT MARKER/TURN LIGHTS AND REAR TURN LIGHTS TO FLASH IN A MANNER SIMILAR TO HAZARD WARNING, RATHER THAN FLASHING ON THE DESIRED SIDE ONLY.
ON CERTAIN SPORT UTILITY VEHICLES, VIBRATION AND HEAT MAY CAUSE THE TAIL LAMP/STOP LAMP BULB TO LOOSEN IN ITS SOCKET. IF THIS OCCURS, THE BULB MAY FLICKER AND EVENTUALLY BECOME INOPERATIVE.
Complaints are unverified owner reports to NHTSA and are not normalized for sales volume. One complaint can cite several components.
“LOW BEAM LIGHTS GO OUT WHEN RIGHT TURN SIGNAL IS APPLIED AND RETURNS TO CENTER POSITION. A/C COOLING FAN DOES NOT COOL COMPRESSOR ENOUGH TO RUN A/C AT LOW SPEEDS CAUSING PRESSURE TO BUILD UP IN FERON RECEIVER. CAR IS AT IDLE OR LOW SPEED.”
“TL* THE CONTACT OWNS A 2004 BUICK RAINIER. THE CONTACT STATED THAT THE HEADLIGHTS TURNED OFF INTERMITTENTLY WITHOUT WARNING. THE CONTACT STATED THAT THE HEADLIGHTS REMAINED OFF FOR APPROXIMATELY SIX MINUTES. WHEN THE LIGHTS TURNED BACK ON, THE LIGHTING WAS DIM. THE VEHICLE WAS TAKEN TO J.D. BYRIDER (5101 NEW BERN AVE, RALEIGH, NC 27610) WHERE THEY REPLACED THE REPLACED THE HEADLIGHT DRIVER MODULE ON TWO DIFFERENT OCCASIONS, BUT THE FAILURE RECURRED. THE MANUFACTURER WAS NOT CONTACTED. THE VEHICLE WAS NOT REPAIRED. THE FAILURE MILEAGE WAS 150,471.”
“I WAS MAKING ON U-TURN ON A MAJOR HIGHWAY, I CAME TO A COMPLETE STOP. THEN I CONTINUED TO PROCEED, MY BACK TIRES WAS STUCK. THEY STARTED SLIDING ON THE ROAD, THEY WOULD NOT TURN. DRIVING STRAIGHT FORWARD IS FINE. ONLY MAKING TURN AND PARKING ISVERY DIFFICULT. I HAD IT CHECKED BY A MECHANIC, HE SAID THAT MY TRUCK IS STUCK IN 4WD. ALSO MY CV JOINT SEAL HAS A LEAK.”
Towing, payload and dimensions aren’t in the EPA or NHTSA data, so we don’t list them.
| Version | City | Hwy | Comb. | Fuel / yr | CO₂ g/mi |
|---|---|---|---|---|---|
| Rainier 2WD Auto 4-spd, 6 cyl, 4.2 L · Rear-Wheel Drive | 14 | 19 | 16 | $4,000 | 555 |
| Rainier 2WD Auto 4-spd, 8 cyl, 5.3 L · Rear-Wheel Drive | 14 | 18 | 16 | $4,000 | 555 |
| Rainier AWD Auto 4-spd, 6 cyl, 4.2 L · 4-Wheel or All-Wheel Drive | 14 | 19 | 16 | $4,000 | 555 |
| Rainier AWD Auto 4-spd, 8 cyl, 5.3 L · 4-Wheel or All-Wheel Drive | 13 | 17 | 15 | $4,300 | 592 |
| Item | Miles | Time | Note |
|---|---|---|---|
| Engine oil & filter | 5,000–10,000 mi | 6–12 months | Follow the oil-life monitor if fitted |
| Tire rotation | 5,000–7,500 mi | Every oil change | Check pressure monthly |
| Engine air filter | 15,000–30,000 mi | 1–2 years | Sooner in dusty areas |
| Cabin air filter | 15,000–25,000 mi | 1–2 years | |
| Brake fluid | — | 2–3 years | Absorbs moisture over time |
| Coolant | 60,000–100,000 mi | 5–10 years | Long-life coolants last longer |
| Spark plugs | 60,000–100,000 mi | — | Iridium/platinum plugs at the long end |
| 12V battery | — | 3–5 years | Heat shortens battery life |
2 safety recalls as of Oct 28, 2026, according to NHTSA. Recall repairs are free at a dealer. Check your VIN to see whether your car is included and whether the repair was done.
Owners filed 158 complaints with NHTSA. The most-cited components are electrical system (83), exterior lighting (21), power train (15). Complaints are unverified owner reports and aren't adjusted for how many cars were sold.
The EPA rates the 2004 Buick Rainier at 15–16 mpg combined, depending on engine and drivetrain (4 versions rated).