2007 Yukon Denali Suspension Issues Resolved

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Seapro

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In 2015 I decided to purchase a bigger tow vehicle to tow my boat. I purchased a 2007 Yukon Denali with 144,000 miles on it. Since owning this Yukon I have been constantly having the "Check Suspension" message every time I tow or go on long distance rides. I have changed my air compressor, air shocks, compressor relay, all the auto leveling sensors and just recently the suspension control module. I finally have not gotten any suspension messages after towing my boat 20 miles. I am writing this to maybe help someone that was or is having the same problem I had. I changed the air shocks after checking if they held air and they were leaking and after changing them and starting the Yukon they did not pump up. I found that the 40 amp fuse was blown to the compressor. I replaced the fuse and the pump still did not come on so I pretty much knew the pump was dead so I replaced it and the shocks pumped up. i thought I was good to go, wrong. I towed the boat a couple of weeks later and on the way home I got the suspension message again. I started looking at every wire and sensor I could find for the suspension and I noticed a snapped leveler so I decided to change all four of them. I got another message the next time I towed the boat. I only had the electronic suspension module left to check. When I dropped the spare tire down I saw that the module had been removed off the frame and was just hanging there. I brought the module to the dealer and paid to have it checked and it was fried. I replaced the module and haven't had any problems with it since. Hope this helps if you are having the same problems.
 

Joseph Garcia

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Great writeup!

Did you do the ALC trim set recalibration (auto level control), after installing the new ESCM?
 
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Seapro

Seapro

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The module has to be programmed before it is any good. I purchased the module online and had GMFLASH program it. It is a bear disconnecting it from the harness so be careful. You can have the dealer program it on the vehicle but it is expensive.
 
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