C0590 on 2009-2014 Cadillac CTS-V — Right Rear Shock Absorber Actuator Circuit
1 vehicles · 1 makes
Most Reported On
C0590 is an OBD-II diagnostic trouble code meaning “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. 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 C0590.
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 C0590 mean?
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.
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?
Repair costs vary widely depending on the root cause and vehicle.
Which vehicles are affected by C0590?
Au7o has documented C0590 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.