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Go Back   Hummer Forums by Elcova > Hummer H2 Discussion Forums > Technical Discussion and Customizing your H2

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  #1  
Old 01-14-2009, 04:18 PM
fbodyguy99@hotmail.com fbodyguy99@hotmail.com is offline
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Default Re: Rear Air Suspension Problems

Ok this is the deal i have a 2003 hummer h2 i used to like it now its getting on my nerves with the damn sensors i have a tech 2 i bought so it pulled these codes up in the history first one is
1 C0631 RIGHT REAR POSITION SENSOR
2ND IS C0712 LEVEL CONTROL COMPRESSOR RELAY CIRCUIT I LOVE A PART NUMBER FOR THAT SO I CAN BUY IT 3RD THE MOST FAMOUS ANNOYING ONE IS CO711 LEVEL CONTROL AIR PRESSURE SENSOR STAYS ON ALL THE TIME AND LIGHT FOR HEIGHT CONTROL FLASHES NON STOP
AND MY RIGHT IS 3.65 SENSOR VOLTS
LEFT IS 2.53 SENSOR VOLTS THE LEFT ONE GOES UP N DOWN LIKE CRAZY WITH THE SCANNER WHILE DRIVING SO WHAT SHOULD I DO FIRST PLEASE Do you guys think i need air bags too or just fix the sensors
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Old 01-14-2009, 08:02 PM
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HUMTECH HUMTECH is offline
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Default Re: Rear Air Suspension Problems

I would start by replacing the relay. It is located below the brake master cylinder on the 03 model year just above the frame rail(dont know the part #). Then try to clear all codes. On level ground with the engine running check your level sensor data again, they should read between 2.5 and 3.5 volts, any lower or higher and they are not in the proper range when sitting still and level. If the right one still is reading high you can try to adjust it but will likely need to be replaced. If you do replace it you will then require a trim height learn procedure.
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Old 03-23-2009, 08:25 PM
agood1 agood1 is offline
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Default Re: Rear Air Suspension Problems

How often should the compressor kick on? Mine comes on every 5-10 minutes.....I can't really tell if it is because of a leak, or that it is just doing it's job.
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