C0580 on 2009-2014 Cadillac CTS-V — Brake Booster Motor A Phase U/V/W Circuit Low
1 vehicles · 1 makes
Most Reported On
C0580 is an OBD-II diagnostic trouble code meaning “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). 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 C0580.
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.
- All-system diagnostics (25+ modules)
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- Oil reset, EPB, BMS, TPMS, injector coding
- 7-inch touchscreen with Android OS
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 C0580 mean?
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).
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?
Repair costs vary widely depending on the root cause and vehicle.
Which vehicles are affected by C0580?
Au7o has documented C0580 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.