C0590 Suspension Code Help - SOLVED

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Foggy

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On my new to me 2013 Denali (purchased this way) I've got the C0590 service suspension
code. Right Rear Actuator issue.
Is this usually the actual shock? Z55 Air Suspension
Or the ride height sensor?
Or any advice/ Experience is appreciated
 
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Foggy

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To be more specific: it's the C0590: 4
Right Rear Actuator Circuit Open
TIA
 
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Foggy

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Joseph Garcia

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First make sure that the electrical connector is in good condition and fully inserted into the shock.

If the connector is good, then put a 5 Ohm 25 watt resistor across the 2 electrical leads for that shock. If the code goes away, then it is a faulty shock. If the error remains, then you have a faulty electrical wire or the suspension control module itself.
 
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Foggy

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First make sure that the electrical connector is in good condition and fully inserted into the shock.

If the connector is good, then put a 5 Ohm 25 watt resistor across the 2 electrical leads for that shock. If the code goes away, then it is a faulty shock. If the error remains, then you have a faulty electrical wire or the suspension control module itself.
Thank you for that info. It's the electrical side of these sensors that I'm just
not that versed in (body junk)
I did stay up most of the night working on this 2013 REAR
Put new powerstop tow brakes/rotors/pads
The M'fr caliper bracket bolts were about welded into the rear though..
And no way of getting a direct impact on them. Used heat and a big breaker

Removed the shocks. Found that Right Side air bag ripped/blown out.
So I replaced both with my used low mileage GM oe shocks that I kept
from my 2014 when I bought new for it in 2019-2020
Cleared code. Still need to test drive it.
They had the exact same GM part # on the shock tags.
I was a little worried as this 2013 came with 22" wheels & some of
the listings show diff part # for 22" wheels.

I put my old 20" wheels from my 2014 with new tires on the 2013
Hoping it rides better. I didn't care for the ride of 22"'s.. And they have
really good michelin tires on them.
 

Joseph Garcia

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Thank you for that info. It's the electrical side of these sensors that I'm just
not that versed in (body junk)
I did stay up most of the night working on this 2013 REAR
Put new powerstop tow brakes/rotors/pads
The M'fr caliper bracket bolts were about welded into the rear though..
And no way of getting a direct impact on them. Used heat and a big breaker

Removed the shocks. Found that Right Side air bag ripped/blown out.
So I replaced both with my used low mileage GM oe shocks that I kept
from my 2014 when I bought new for it in 2019-2020
Cleared code. Still need to test drive it.
They had the exact same GM part # on the shock tags.
I was a little worried as this 2013 came with 22" wheels & some of
the listings show diff part # for 22" wheels.

I put my old 20" wheels from my 2014 with new tires on the 2013
Hoping it rides better. I didn't care for the ride of 22"'s.. And they have
really good michelin tires on them.
Your reply triggered one more potential source of this issue. There is an electrical connector on top of the frame over the rear wheels that can become inadvertently disconnected, when you change out shocks and have to fiddle with the top shock bolt. This has happened to me, as well as other folks on this Forum. Check that connector out to ensure that it is fully inserted/connected.
 
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Foggy

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Your reply triggered one more potential source of this issue. There is an electrical connector on top of the frame over the rear wheels that can become inadvertently disconnected, when you change out shocks and have to fiddle with the top shock bolt. This has happened to me, as well as other folks on this Forum. Check that connector out to ensure that it is fully inserted/connected.
That happened to me on my 2014 several years ago !!!

Went out for my test drive. No more suspension codes. Was just a bad shock
Rides much better. The 20" rims are better too. More rubber !!!
 

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