C0590 on Cadillac: How to Diagnose & Fix
Right Rear Shock Absorber Actuator Circuit
1 Cadillac model · 1 documented issue
C0590 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)
C0590 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 C0590 mean on a Cadillac?
C0590 stands for "Right Rear Shock Absorber Actuator Circuit." This is a General Motors chassis code used on vehicles with electronically controlled (real-time / magnetic ride) damping, including Chevrolet, GMC and Cadillac models. The suspension control module pulse-width-modulates current to each shock absorber actuator and continuously measures actual current; when the actual current deviates from what was commanded on the right rear damper circuit, C0590 sets. Sub-codes identify the failure mode: C0590:01 short to battery, C0590:02 short to ground, C0590:04 open circuit. The module usually defaults that corner to a fixed damping rate, so ride quality and body control get worse but the vehicle remains drivable. On Cadillac it is documented across 1 model: CTS-V.
What are the most common causes of C0590?
The most common causes of C0590 are: Failed right rear electronically controlled shock absorber / damper, Damaged or chafed wiring at the rear shock harness (a common rub point), Corroded, bent, or backed-out connector terminals at the right rear damper, Faulty electronic suspension control module, Poor ground or low system voltage affecting the actuator circuit. The specific cause varies by vehicle.
How much does it cost to fix C0590 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 C0590 on a different make?
View C0590 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.