Rear Suspension Low Due to Failed Air Compressor on Buick Rainier

On vehicles equipped with rear air springs, the air compressor may fail causing the rear suspension to sit low.

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Average mileage: 104,645 (10,000–196,572)
4 model years affected: 2004, 2005, 2006, 2007
306 people reported this problem
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Viewing 1 - 20 of 185 problem details
2004 Buick Rainier 146,000 mi,
Looks like I will have to having mine replaced because the back is sagging badly. Does anyone know how much this cost?
2006 Buick Rainier 80,000 mi,
2004 Buick Rainier 108,000 mi,
Went to leave work one day and the tailend of my car was almost sitting on the ground. When I crank the car up you can actually hear the air compressor come on and it pumps the car right back up. It didn't happen again for several weeks but now it is starting to happen more often but still very random.
2004 Buick Rainier 125,000 mi,
Everytime I turn my Rainier off the rear suspension system leaks air and the back of my truck lowers all the way to the ground. Cannot drive it like that and more and more often it takes longer and longer before it will rise back up. Havent had it repaired and afraid to get estimate. Unemployed and income very limited. HELP!!!!
Air Ride & Electrical Issues! My wife loves this vehicle and it was trouble free until recently. As other posts state, the rear of the Rainier will sit down if not driven for a couple days. I suspect a slow leak in a line or fitting and a liberal application of 'Snoop' may identify it... have yet to find the gumption to get under the vehicle. Also, the electical issues have started. First the A/C controls malfunctioned and where replaced, and now the guage cluster is giving erroneous readings - or none at all. The speed reads low or 0, the oil pressure pegs high, and the gas level is questionable. So far the digital 'miles to empty' idication has remained functional. If anyone knows of a recall or a way to get GM to recognize this as their problem, please let me know.
2005 Buick Rainier 74,000 mi,
Just another major problem that needs to be fixed. Did GM plan for all their systems to fail or should this whole model be recalled as a lemon!
2004 Buick Rainier 125,000 mi,
Every 2 or 3 days my car will have sagged overnight, sometimes it will raise once I start the ignition and other times it will stay sagging for the entire day. It is very irritating because the truck will drive so raggedy.
2005 Buick Rainier 123,000 mi,
My air ride compressor went out, wish they made a way you could manually air up til repair.
2004 Buick Rainier 125,000 mi,
Rear end of SUV keeps dropping and upon a restart will lift up, only to fall while driving.
2004 Buick Rainier 36,000 mi,
Haven't fixed it yet. In fact I only recently became aware that the air compressor was not coming on when I started the car. (The compressor does activate when I turn it on to use it as a tire inflater.)
2006 Buick Rainier 93,000 mi,
My rear compressor went out. I haven't had it fixed yet since it's going to be 875$ any suggestions...if people are having this issue why isn't it a recall?
2004 Buick Rainier 92,000 mi,
ive had the same problems out of my vehicle and im shock that buick and or gm have not owned up to their defects. however when the vehicle is working properly its a beautiful ride. First you have the wiring harness failure then the rear suspension, the ac blows strong depending on how fast you are going and the rear lights goes on and off when they want too. Im thinking about filing a lawsuit against gm for not owning up to their consisting failure with this buick rainier. Do i have anyone willing to join me in my quest?
Feels like I'm riding a roller coaster, and I can't drive up anything too steep because bottom scrapes. Seemed like it went down and then never came back up
2004 Buick Rainier 110,000 mi,
Having rear air bags replaced with a coil spring conversion kit. No more problems.
2005 Buick Rainier 115,000 mi,
My 05 Buick Rainier takes spells of sagging in the rear end. Sometimes it will go for days without sagging and then it will drop at random drop within a few hours. This leads me to believe it is a valving issue in the compressor. If it was a faulty shock, it would do it all the time. Many are told that the shocks are the problem, but after replacing them, it happens again. It happens to randomly to be a permanent leak in a shock. Gm should fess up and recall these compressor's because over time the valving gets sticky or corroded and does not work properly. Many dealers have scammed people into replacing the entire rear suspension because of this and that is wrong. Come on GM, man-up and fix the problem.
2007 Buick Rainier 100,020 mi,
The same issues as the others. Almost every night the rear end lowers but then raises when the engine is started. Once a few weeks ago, we picked up family from the airport and the extra rear passengers and luggage the rear end lowered while driving and we had to go very slow because there was no suspension.
2004 Buick Rainier 104,000 mi,
the back end of the vehicle sits low upon parking and bumps back up when i warm it up
2005 Buick Rainier 130,000 mi,
leaking air bags in rear and compressor sometimes does not work in cold weather.
2006 Buick Rainier 115,000 mi,
every time we shut car off, the air system deflates. when you start the car you have to wait for the air system to inflate, or you fell every bump in the road, the ride is terrible. have not looked at it yet, not sure what the problem is.
2004 Buick Rainier 130,000 mi,
Back end is really low to the ground rises when it wants to.