The 2019 GMC Savana's ABS warning light indicates the anti-lock braking system has detected a fault and may be disabled. While regular brakes usually still function, ABS protection is compromised.
ABS System Components
The ABS uses wheel speed sensors at each wheel, an ABS module/pump assembly, and control wiring. Faults in any component can illuminate the warning light.
Common ABS Problems
Wheel Speed Sensors
These sensors detect wheel rotation rate. Dirt contamination, damage from road debris, or internal failure causes ABS codes. Commercial vans are exposed to more road contamination.
Sensor Wiring
Wiring from sensors to the ABS module can be damaged by road debris or corrosion, causing intermittent or consistent faults.
ABS Module
The ABS module can develop internal electronic faults. Module failures often require replacement.
Tone Rings
The toothed ring that the sensor reads can become damaged or accumulate debris, affecting sensor readings.
Safety Considerations
With ABS disabled, wheels can lock during hard braking. Commercial vehicle operators should be aware of reduced braking control in emergency situations.