Service Suspension notification on every start

[Akinshake]

2016 Yukon XL Denali 4x4.
I deleted the mangaride with a set of fox coilovers and Xingeering bypass modules. I have been getting a service suspension notification everytime I start now for a bout 2 months, ( I havent touch my suspension system in over a year). There is nothing in my suspension system that is electronic anymore. I figured this would have been a no brainer issue that it is one of my bypass modules, i mean how can it not, right? When I emailed Xingeering, they want to rent me a module to test them. Honestly, I dont want to pay the rental and shipping cost out of principal.

Any recommendations or thoughts?

Thanks guys.

 

[STORMIN08]

They are a cheap resistor more than likely....so they could indeed fail.

Why not just buy a new set, swap one at a time and then have a spare as well

 

[olyelr]

I had the exact same thing happen, also running fox/xineering modules. But, was running the factory rear shocks at the time which i new were toast. So i was not sure if it was an issue with the modules or the rear shocks. They sent me the scanner tool for diagnosing purposes, which showed an issue with one of the modules. Then they just sent new modules out free of charge.

They are a great company to work with IMO. I had no issue paying whatever small fee there was to rent the scanner tool. It is what it is.

I am not sure which is better now…the suspension code no longer popping up on every start up or the 84mph top speed limit set by the code. They are both a pain in the ass!

 

[Oh Kee Pah]

I know renting the scanning tool doesn't seem great; but, it's the easiest way to start diagnosing the problem.

I have had the Xineering GM Shock Sim resistors for over 50k miles now. Yes, there have been some failures that have been good learning experiences for me. Initial install (at local auto shop) saw the resistors get a voltage spike which fried one of the ride heights. Xineering sent me a new ride height resistor. I also think that this local auto shop broke the small plastic locking clips on several of the ride height sensors, which makes the connection between sensor and Xineering resistor not 100% solid. I've gone ahead and electrical taped around the plugged in components. I think winter weather (snow and salt and gunk) here in Maine played a role in another resistor failing. Xineering again replaced that one.

Most recently, I've been throwing a RR Ride Height Sensor code. Not always, just from time to time. Using Xineering's scan tool, and a volt meter, I was able to determine that the RR Ride Height Sensor is shot. I literally had to manufacture a new sensor rod to "hold" the sensor in a good position. Using the scan tool, I was able to read the voltages going to the RR Ride Height sensor. As I moved the sensor arm up and down I saw the voltages going up and down. Once around 2.4 volts, I cut my rod and installed. For reference, the sensor arm is now about 1 inch higher than where it should be, but I'm getting proper voltage.

Why is voltage important? The Xineering Shock Sims product rely on proper voltage to function. This is one reason why the ride height trim procedure is recommended by the company upon installation of the product. This reprograms the computer with the new ride height, but also stores the values associated with the ride height sensors.

This leads to the BIG update. I haven't seen anyone talking about it here on the TYForum, but I have been Beta testing for about 9 months now. Super impressed! Xineering's new OBDSS product is better performing, easier to install and maintain, and works great!
http://www.shocksims.com/obdss.html

This new product accomplishes the same MRC delete on our GM trucks and SUVs without using ride height or shock simulator resistors. This means that the 8 resistors on the exterior of the vehicle (plugged in underneath) are moved inside and live under the dash, plugged right in to the OBDII port. The OBDSS requires proper voltages at all 4 corners, so your OE sensors need to be functioning properly. Xineering has some neat protective plugs you can also install to keep your sensor clean from road debris. I have been really happy with how this new product has performed. I am using an OBDII splitter also, so there is an option to have the Xineeering shock sims running as well as another product (ie: AFM delete maybe)



Safe Travels!

 

[Akinshake]

They are a cheap resistor more than likely....so they could indeed fail.

Why not just buy a new set, swap one at a time and then have a spare as well

Mainly because the " Cheap " resistors cost $450 a set.

 

[Akinshake]

I had the exact same thing happen, also running fox/xineering modules. But, was running the factory rear shocks at the time which i new were toast. So i was not sure if it was an issue with the modules or the rear shocks. They sent me the scanner tool for diagnosing purposes, which showed an issue with one of the modules. Then they just sent new modules out free of charge.

They are a great company to work with IMO. I had no issue paying whatever small fee there was to rent the scanner tool. It is what it is.

I am not sure which is better now…the suspension code no longer popping up on every start up or the 84mph top speed limit set by the code. They are both a pain in the ass!

What code limited you at 84mph? Ive got a blackbear tune so hopefully that should never be an issue for me. I would be furious is something i did to "fix" an issue limited me like that.

 

[Akinshake]

I know renting the scanning tool doesn't seem great; but, it's the easiest way to start diagnosing the problem.

I have had the Xineering GM Shock Sim resistors for over 50k miles now. Yes, there have been some failures that have been good learning experiences for me. Initial install (at local auto shop) saw the resistors get a voltage spike which fried one of the ride heights. Xineering sent me a new ride height resistor. I also think that this local auto shop broke the small plastic locking clips on several of the ride height sensors, which makes the connection between sensor and Xineering resistor not 100% solid. I've gone ahead and electrical taped around the plugged in components. I think winter weather (snow and salt and gunk) here in Maine played a role in another resistor failing. Xineering again replaced that one.

Most recently, I've been throwing a RR Ride Height Sensor code. Not always, just from time to time. Using Xineering's scan tool, and a volt meter, I was able to determine that the RR Ride Height Sensor is shot. I literally had to manufacture a new sensor rod to "hold" the sensor in a good position. Using the scan tool, I was able to read the voltages going to the RR Ride Height sensor. As I moved the sensor arm up and down I saw the voltages going up and down. Once around 2.4 volts, I cut my rod and installed. For reference, the sensor arm is now about 1 inch higher than where it should be, but I'm getting proper voltage.

Why is voltage important? The Xineering Shock Sims product rely on proper voltage to function. This is one reason why the ride height trim procedure is recommended by the company upon installation of the product. This reprograms the computer with the new ride height, but also stores the values associated with the ride height sensors.

This leads to the BIG update. I haven't seen anyone talking about it here on the TYForum, but I have been Beta testing for about 9 months now. Super impressed! Xineering's new OBDSS product is better performing, easier to install and maintain, and works great!
http://www.shocksims.com/obdss.html

This new product accomplishes the same MRC delete on our GM trucks and SUVs without using ride height or shock simulator resistors. This means that the 8 resistors on the exterior of the vehicle (plugged in underneath) are moved inside and live under the dash, plugged right in to the OBDII port. The OBDSS requires proper voltages at all 4 corners, so your OE sensors need to be functioning properly. Xineering has some neat protective plugs you can also install to keep your sensor clean from road debris. I have been really happy with how this new product has performed. I am using an OBDII splitter also, so there is an option to have the Xineeering shock sims running as well as another product (ie: AFM delete maybe)



Safe Travels!

Thanks for all the good info. Looks like my only option is to pay for the rental. I was really hoping there was an easier option. But I will update when I get it figured out.

 

[olyelr]

What code limited you at 84mph? Ive got a blackbear tune so hopefully that should never be an issue for me. I would be furious is something i did to "fix" an issue limited me like that.

The service suspension code limits the speed.

 

[Akinshake]

The service suspension code limits the speed.

Really? I just went on a 700 mile trip and i could have sworn that i was over 84mph several times. I do have a black bear tune though so i dont know if that effects it.

 

[olyelr]

Really? I just went on a 700 mile trip and i could have sworn that i was over 84mph several times. I do have a black bear tune though so i dont know if that effects it.

Probably does. All i know is when the wifes service suspension code came on the rig quit going over 84 mph.

 

[Big Mama]

Aren’t there resistors much cheaper than $450? Agreed the scan tool is the way to go versus just throwing parts at it but I just bought shocks with resistors for less than that.

 

[Akinshake]

So heres the update.

I had Xineering send me the SCM scanner.

Had multiple codes.
C0575-0D Left Front Shock Sig Perf
C0575- 1A Left Front Shock Sig Perf
c0625- 06 Left Rear Pos Sensor Short to Ground
C0630- 06 Right Rear Pos Sensor Short to ground
c0660- 05 No Description on File
c0711- 00 No Description on File

xineering sent me a new left front shock simulator.

They said the c0660 is Level control Exhaust Valve Circuit Malfunction and C0711 is Level control air pressure sensor malfunction. They said these are unrelated to the bypass kit and they are both going to trigger the suspension light even after i install the replacement shock simulator.

Well luckily, after plugging the new sensor in and doing the trim height procedure, everything is looking good with no additional codes. When i cleared the codes originally, the codes came back immediately so hopefully this truly fixed the problem.

We shall see. I am going to put some weight in the back this weekend so we will see if anything comes back. I am not sure the compressor is still working, i haven't heard it come on lately but not under weight, maybe it doesn't need to. I still have the factory compressor hooked up but i plumbed it to airlift helper bags. Not sure it works perfect but i haven't had much if any sag under normal loads.

 

[Akinshake]

after a 250 mile round trip, No codes or messages. I did hear my compressor kick on and turn off so i am assuming everything is working. I probably should hook up the scan tool one more time before i return it, but it appears that the replacing the front left sensor that was bad has fixed all my issues.

 

[olyelr]

Heck yea!

 

[Akinshake]

So my service suspension light is coming back on at every start. Compressor is not kicking on. Now, i did delete the rear air shocks for the Fox shocks. However, i did kinda hybrid adapt the factory compressor and ride height sensors to work with airlift bags i added.

I am assuming the setup i concocted only worked for a while because it wasnt ideal for the compressor. Well, i dont want to repeat the same mistake, so i will most likely just run manual air valve to the bags and added and subtract air as needed as i dont tow enough for it to be a huge issue.

Is there a good way to delete the air compressor, mainly the service air suspension light from coming on every start up?

thanks

 

[olyelr]

So my service suspension light is coming back on at every start. Compressor is not kicking on. Now, i did delete the rear air shocks for the Fox shocks. However, i did kinda hybrid adapt the factory compressor and ride height sensors to work with airlift bags i added.

I am assuming the setup i concocted only worked for a while because it wasnt ideal for the compressor. Well, i dont want to repeat the same mistake, so i will most likely just run manual air valve to the bags and added and subtract air as needed as i dont tow enough for it to be a huge issue.

Is there a good way to delete the air compressor, mainly the service air suspension light from coming on every start up?

thanks

Hmmmm, im not sure how…but i bet there is a way.

Personally I think i would get the compressor working again. I have dreamt about doing that very setup before and always thought it would be pretty slick as hell.

 

[Akinshake]

Hmmmm, im not sure how…but i bet there is a way.

Personally I think i would get the compressor working again. I have dreamt about doing that very setup before and always thought it would be pretty slick as hell.

I thought the same thing too. If the compressor just went out on its own, id be ok with replacing it. but i am concerned that it was my set up that caused failure so id be fighting this battle forever... i will probably bypass the compressor for now, i am about to pull a trailer with a truck on it for 1400miles. just dont want to sag the entire way.

 

[Big Mama]

I wonder if you can use the resistors that come with aftermarket air ride bypass shocks? I changed to these last year. My compressor went out a few months back but it took me a while to notice that it wasn’t coming on at start up. I never had a suspension light come on.

 

[Oh Kee Pah]

I would suggest giving Xineering a call. Click for: Xineering's "Shock Sims" website
Will, or owner Max, should be able to help you get going in the right direction.
Their knowledge of the MRC is very solid, as well as the DTCs associated with the suspension system.

I'm currently working with Max at Xineering to chase a faulty Ride Height Sensor wire.
Ball is in my court to get some voltage readings coming from my RR Ride Height wiring, but I'm yet to get under the Tahoe and mess around with things this spring.

 

[dbaudo1]

I realize this is an old thread but can someone tell me which scan tool they sent you? They tell me over the phone that it’s a very expensive tool but they have a video where they use a $200 scanner. I’d rather spend $200 on a tool I can keep rather than rent one.

Oh yeah. I’m having the same issue but have the obd2 system they sell and not the individual bypass plugs