C0585 on 2009-2014 Cadillac CTS-V — Left Rear Shock Absorber Actuator Circuit
1 vehicles · 1 makes
Most Reported On
C0585 is an OBD-II diagnostic trouble code meaning “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. This code is most commonly reported on 2009-2014 Cadillac CTS-V.
Common Causes
Diagnostic Tools
This is a chassis code. A basic engine-code reader will not show it — you need a scanner that reads chassis modules. These read C0585.
One caveat that applies to every scanner: only powertrain codes are standardised across manufacturers. Body, chassis and network coverage is "enhanced" diagnostics, and how deep it goes varies by make and model year — check your specific vehicle against the tool's coverage list before buying.
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Shop-level tablet with all-system coverage and bi-directional control, so you can command a module rather than only read it.
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What you can do yourself, and what needs a shop
Reading the code, clearing it, and watching whether it returns is a driveway job with the right scanner. These steps are not:
- Module programming or software updates — needs the manufacturer software or a J2534 pass-through with a paid subscription.
- Replacing a control module — most are VIN-programmed and immobilizer-registered, so a new one does nothing until it is coded to your car.
- Airbag/SRS component work — a stored fault can deploy a live device.
If the vehicle is still under warranty, check for an open recall or technical service bulletin before buying anything — the repair may already be covered.
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FAQ
What does C0585 mean?
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.
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?
Repair costs vary widely depending on the root cause and vehicle.
Which vehicles are affected by C0585?
Au7o has documented C0585 across 1 vehicle models from 1 manufacturers: Cadillac.
Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.