C0585 on Cadillac: How to Diagnose & Fix
Left Rear Shock Absorber Actuator Circuit
1 Cadillac model · 1 documented issue
C0585 on Cadillac by model: symptoms, diagnosis and fix
GM PI0430C covers 2009-2014 Cadillac CTS-V vehicles with Magnetic Ride Control when the Service Suspension System message appears with DTC C0575, C0580, C0585 or C0590. A 90-degree electrical connector at the top of a shock actuator may be incompletely seated or partially disconnected; the bulletin does not establish universal shock failure.
Common Symptoms
- Service Suspension System message
How to Fix
Follow PI0430C connector inspection, seating and circuit checks before replacing a shock absorber. Continue normal service-information diagnosis if the connector path does not resolve the message or DTC.
Sources for this issue (1)
C0585 code reference
General diagnostic-code context. The code alone does not confirm a cause for your vehicle; use the applicable issue card and its sources.
Frequently asked questions
What does C0585 mean on a Cadillac?
C0585 stands for "Left Rear Shock Absorber Actuator Circuit." A GM chassis code (Buick, Cadillac, Chevrolet, GMC) in the electronically controlled suspension — Autoride, Magnetic Ride Control, and similar systems. The suspension control module commands variable current to each shock absorber actuator in response to road, braking, and steering inputs, and compares commanded current against measured current; when the left rear circuit does not match, C0585 sets. Symptoms are a suspension / Service Ride Control warning message and a ride that feels harsh, floaty, or uncontrolled at that corner. The two-digit suffix narrows the fault: :01 short to battery, :02 short to ground, :04 open circuit. On Cadillac it is documented across 1 model: CTS-V.
What are the most common causes of C0585?
The most common causes of C0585 are: Open, shorted, or chafed wiring in the left rear damper harness (a common wear point along the suspension travel path), Corroded, bent, or backed-out connector terminals at the left rear shock absorber, Failed electronic shock absorber/damper actuator solenoid, Moisture intrusion into the connector or module, Poor ground for the suspension control module, Failed electronic suspension control module. The specific cause varies by vehicle.
How much does it cost to fix C0585 on a Cadillac?
Repair costs vary widely with the root cause and Cadillac model; each issue on this page carries its own estimate where one is published.
Looking for C0585 on a different make?
View C0585 across all makes →Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.