AHC adjustable height control adjust/trick (1 Viewer)

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Sep 7, 2018
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Arizona
Numerous threads mention lowering the adjustable height control AHC to trick the height sensors to put more air in the air springs and raise the vehicle. I crawled under to do this a few days ago to try and keep the GX in a higher setting to seal off the leak on the rear passenger side until new air springs get here next week. It didn't seem to do anytbing and was still setting on bump stops, however the harsh bucking in the rear suspension seemed to dissipate, but I wasnt totally satisfied. I crawled under tonight and pushed the AHC sensors up, and that ended up lifting the GX and solved the problem. (Sealed/closed the crack in the airspring by inflating it a bit more closing the leak on itself). So for future users a little bit of info and an image of the AHC control sensor of which I loosened the bolt and slid it up to increas the ride height by tricking the air compressor to add more air.

Two notes:
1. Perhaps I was misunderstanding when I read others pushed theirs "down" to achieve a rear lift?
2. When I started I noticed the AHC sensors on mine where not even close to being at the same setting to each other.


20181208_230919_zpsuon9s0na.jpg
 
Last edited:
Just did the same thing recently. Mine were also set in completely different positions. I maxed out both adjusters and added washers under the brackets as well. Sits about 1.25” higher in normal position now and also stopped leaking overnight as well. Paired with 2” top hat spacers in the front it sits pretty level now.
 
Are you guys saying that the AHC system on a GX is utilizing air and not AHC fluid?
 
AHC only affects the rear axle and uses airbags (air not anything hydraulic) and is standard on all 1st gen GXs. The hydraulic system on the GX is KDSS which uses hydraulic disconnects on the sway bars (which are massive on these) so you get flat on road handling and 4" more articulation offroad than a standard GX and was optional or standard on the sport trim. Most do not have KDSS
 
Hmmmmm, ok thanks for the info
 
Here’s my picture of the bracket he is mentioning, and spacer that I just put in to get some additional lift. It was easier for me to get a piece of steel in there than find 1/4” worth of washers.

4A066CD8-AD43-4B02-8590-E9DE254DF006.jpeg
 
Cool, pics always help!!
 

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