2009 GMC Yukon front suspension clunk

Tiny
SAEED.ALMEQ
  • MEMBER
  • 2009 GMC YUKON
  • 61,000 MILES
Hi
i have a yukon denali they come with autoride suspension as you know im having a front clunk when I go to speed bumps +car is not comfortable any more on high way its solid as a rock on high way, ride can break my back now but when I disconnect the connectors on the front shock the ride became smooth with no clunks?

i replaced new shocks infront
replaced worn bushes
(ride is very good when I disconnect front shocks connector )
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Thursday, July 25th, 2013 AT 2:56 AM

7 Replies

Tiny
HMAC300
  • EXPERT
Have it scanned for codes to see what'swrong with thesystem.
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Thursday, July 25th, 2013 AT 6:00 AM
Tiny
SAEED.ALMEQ
  • MEMBER
No code is there
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Thursday, July 25th, 2013 AT 3:15 PM
Tiny
HMAC300
  • EXPERT
You need a pro type scanner not an auto parts it won't read it
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Thursday, July 25th, 2013 AT 5:17 PM
Tiny
SAEED.ALMEQ
  • MEMBER
Hi
I bought a pro scanner and scanned all systems in the car but no codes found?
I got into suspension module and read data. Found that speed signal is very high like I'm driving 100km it will show around 180km?
What should I do? Should I replace suspension module?
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Thursday, January 16th, 2014 AT 1:05 PM
Tiny
HMAC300
  • EXPERT
If you have a pro scanner you should be able to pull a code I don't think you do I think you got one from an auto parts store which arent' the same. Check these sensors in front for being bent or a rod broken then see if you can pull a code and you have to know if it has Z95 option or not. Which should be on glove box door. See pic you will have one of these on each wheel area.
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Thursday, January 16th, 2014 AT 6:07 PM
Tiny
SAEED.ALMEQ
  • MEMBER
I have rpo z55 not z95 and I'm using launch x431 scan tool
I can read live data from suspension module. Iv checked all sensors of suspension all good.
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Friday, January 17th, 2014 AT 2:21 AM
Tiny
HMAC300
  • EXPERT
Then check bushing for a front end problem like in control arm bushings or worn ball joints etc. If you are getting no codes then it 's another problem like I described with the sensor disconnected/bent arm or like that.
If the system is functioning abnormally, performing the ALC Trimset recalibration procedure may correct the condition. When a system component has been replaced, ALC Trimset calibration must be performed. In the scan tool Special Functions menu, select ALC Trimset and follow the screen prompts to perform the procedure. Once the process has been completed, the system should be fully functional.
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Friday, January 17th, 2014 AT 7:42 AM

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