C0580 on Cadillac: How to Diagnose & Fix
Brake Booster Motor A Phase U/V/W Circuit Low
1 Cadillac model · 1 documented issue
C0580 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)
C0580 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 C0580 mean on a Cadillac?
C0580 stands for "Brake Booster Motor A Phase U/V/W Circuit Low." A chassis code for the electric brake booster (electro-hydraulic / regenerative brake assist) used on hybrids, EVs, and many late-model vehicles with brake-by-wire assist. The brake-assist control module drives the booster motor through a three-phase (U/V/W) inverter and sets C0580 when the voltage on one or more phase circuits is below the threshold required for normal operation. Expect a hard, high-effort brake pedal, loss of power assist, and brake warning lamps. This is a safety-relevant fault — the vehicle can still be stopped but takes substantially more pedal force, and it should be diagnosed before further driving. Related codes in the same family cover the B motor (C0583-C0585). On Cadillac it is documented across 1 model: CTS-V.
What are the most common causes of C0580?
The most common causes of C0580 are: Failed brake booster / brake-assist control module (internal motor driver, MOSFET, or regulator failure), Open, shorted, or corroded wiring in the three-phase motor circuit, Poor connection or corrosion at the booster motor connector, Low system voltage or a bad power/ground feed to the brake-assist module, Failed booster motor windings, Related software calibration issue — check manufacturer bulletins before replacing the booster assembly. The specific cause varies by vehicle.
How much does it cost to fix C0580 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 C0580 on a different make?
View C0580 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.