C0279 ABS Solenoid Relay Circuit Malfunction (Secondary)

Category: Chassis
Severity: ABS Light
Applies to: Tacoma, Tundra, 4Runner

What does C0279 mean on a Toyota?

C0279. ABS Solenoid Relay Circuit Malfunction (Secondary). This Toyota-enhanced code applies to Tacoma, Tundra, 4Runner.

Common causes of C0279

Failed secondary ABS relay
Open secondary relay circuit
Blown fuse
Corroded socket
ECU driver fault

How to fix C0279

Check secondary ABS fuses
Swap the relay
Test control circuit continuity
Inspect the socket
Confirm ABS operation after repair

Sources and review

Last updated 2026-09-25.