C0577 on Cadillac: How to Diagnose & Fix
Left Front Solenoid Circuit Low
1 Cadillac model · 1 documented issue
C0577 on Cadillac by model: symptoms, diagnosis and fix
The 2002 Seville owner manual identifies Continuously Variable Road Sensing Suspension as STS-only and says it displays SERVICE SUSPENSION SYS when the controller detects a problem. The matching 2002 Seville STS RPO F45 OEM service procedure uses an Electronic Suspension Control damper-actuator test, including C0577 as an intermittent-circuit example. The message or DTC does not by itself prove that the electronic strut hardware failed.
Common Symptoms
- SERVICE SUSPENSION SYS message
- Intermittent C0577 damper-actuator circuit DTC
How to Fix
Confirm that the 2002 Seville is an STS equipped with CVRSS RPO F45. Have a qualified technician retrieve the suspension DTCs and run the ESC damper-actuator output test. For an intermittent C0577-type fault, the OEM procedure commands the affected solenoid while the suspected wiring and connector are moved to isolate the circuit or component. Confirm the failed circuit or damper before replacing a strut; do not order a strut, install a passive-conversion kit or defeat the warning from this card.
Sources for this issue (2)
C0577 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 C0577 mean on a Cadillac?
C0577 stands for "Left Front Solenoid Circuit Low." A chassis code in the SAE-defined C0xxx range (the "0" in the second position means it is a generic, not manufacturer-assigned, definition) indicating the control module measured a low-voltage or low-current condition on the left front solenoid control circuit. On most applications this solenoid lives inside the ABS hydraulic modulator and controls brake fluid flow to the left front wheel, so the module typically disables ABS/traction control and turns on the ABS warning light. Base (non-ABS) braking normally still works, but anti-lock function on that corner is lost. Because implementations differ by manufacturer, confirm against your vehicle's factory service information before replacing hardware. On Cadillac it is documented across 1 model: Seville.
What are the most common causes of C0577?
The most common causes of C0577 are: Corroded, loose, or water-intrusion-damaged ABS module connector, Open or shorted wiring in the left front solenoid control circuit, Failed solenoid inside the ABS hydraulic control unit (usually requires modulator/HCU replacement), Failed ABS control module (EBCM) internal driver, Low system voltage or poor ground to the ABS module, Damaged harness where it routes near the left front wheel well. The specific cause varies by vehicle.
How much does it cost to fix C0577 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 C0577 on a different make?
View C0577 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.