C0561 on Ford
System Disabled / Invalid Serial Data Received
C0561 on Ford vehicles indicates system disabled / invalid serial data received. Au7o has documented this code across 1 Ford model — most commonly on F-150. This code sets when the ABS/electronic brake control module disables itself because it received invalid, missing, or implausible serial data over the vehicle communication bus. Rather than a failed brake part, it usually means the module can't trust the data it's getting from another module (or the bus itself is faulty), so it shuts down ABS and stability/traction control as a precaution. Common subcodes include -71 (invalid serial data received) and -72 (alive counter incorrect, indicating a bus or sending-module problem). The driver typically sees ABS, traction, and 'Service Stability/StabiliTrak' messages while base braking still works.
Common Causes of C0561
- •Communication (CAN/serial data) bus fault or corrupted data
- •Failing module on the bus sending bad data
- •Wiring or connector problems on the data lines
- •Corrosion at module connectors
- •Low battery voltage or charging problems
- •Body control module or other module fault
- •Software/calibration mismatch between modules
C0561 on Ford by Model
Ford F-150(1 issue)
- Brake Master Cylinder Fluid Leak into Booster Causing Front Brake Loss2013-2018
The brake master cylinder rear cup seal can roll or fail, allowing brake fluid to leak from the front-circuit reservoir into the brake booster. This drops fluid in the front brake circuit and can reduce or eliminate front-wheel braking (rear brakes remain). Drivers report a long/soft pedal traveling near the floor, a brake warning light, and a low reservoir often with no visible external leak. The defect has driven repeated recalls on 3.5L EcoBoost trucks — 16S24 (2013-2014), 22V-150 (2017-2018), and 25V-236/25S37 (2017-2018) — and caused documented non-injury crashes.
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View C0561 across all makes →Frequently Asked Questions
What does C0561 mean on Ford?▼
C0561 stands for "System Disabled / Invalid Serial Data Received." This code sets when the ABS/electronic brake control module disables itself because it received invalid, missing, or implausible serial data over the vehicle communication bus. Rather than a failed brake part, it usually means the module can't trust the data it's getting from another module (or the bus itself is faulty), so it shuts down ABS and stability/traction control as a precaution. Common subcodes include -71 (invalid serial data received) and -72 (alive counter incorrect, indicating a bus or sending-module problem). The driver typically sees ABS, traction, and 'Service Stability/StabiliTrak' messages while base braking still works. On Ford specifically, this code is documented across 1 model.
What causes C0561 on Ford vehicles?▼
Common causes on Ford: Communication (CAN/serial data) bus fault or corrupted data, Failing module on the bus sending bad data, Wiring or connector problems on the data lines, Corrosion at module connectors, Low battery voltage or charging problems. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix C0561 on a Ford?▼
Repair costs vary widely depending on the root cause and specific Ford model.
Which Ford models have C0561 documented?▼
Au7o has documented C0561 on 1 Ford model: F-150.