Brake Warning Light on a Truck

What The Symptom May Mean

Brake Warning Light is safety-critical and should be handled conservatively. It can be related to multiple systems, so avoid assuming one failed part before diagnosis.

Fault Code Information To Record

Record SPN/FMI, OEM code if shown, active or inactive status, source address, warning lamps, derate state, mileage, engine hours, and related symptoms.

Common Related Systems

Related systems may include engine control, aftertreatment, ABS, transmission, J1939 data link, sensors, wiring, power, and grounds depending on the warning.

When To Stop Safely

Stop safely for red stop lamps, brake warnings, oil pressure warnings, coolant temperature warnings, steering concerns, smoke/fire risk, or severe derate.

When To Contact A Technician

Contact a qualified technician or fleet maintenance contact when the code is active, warning lamps remain on, the truck derates, or the system is safety-related.

Related Pages

• Fault Code Lookup
• Systems
• Disclaimer

Related Fault Code Pages

• Bendix EC-60 UDS 1 / SPN 793 FMI 2
• Bendix EC-60 UDS 3 / SPN 793 FMI 13
• Bendix EC-60 UDS 4 / SPN 629 FMI 12
• Bendix EC-60 UDS 5 / SPN 793 FMI 7
• Bendix EC-60 UDS 6 / SPN 629 FMI 12
• Bendix EC-60 UDS 7 / SPN 793 FMI 1
• Bendix EC-60 UDS 8 / SPN 793 FMI 14
• Bendix EC-60 UDS 9 / SPN 793 FMI 8
• Bendix EC-60 UDS 10 / SPN 793 FMI 10
• Bendix EC-60 UDS 13 / SPN 629 FMI 2
• Bendix EC-60 UDS 14 / SPN 629 FMI 12
• Bendix EC-60 UDS 15 / SPN 1808 FMI 2
• Bendix EC-60 UDS 16 / SPN 629 FMI 12
• Bendix EC-60 UDS 17 / SPN 629 FMI 12
• Bendix EC-60 UDS 18 / SPN 629 FMI 2
• Bendix EC-60 UDS 19 / SPN 629 FMI 2
• Bendix EC-60 UDS 20 / SPN 629 FMI 12
• Bendix EC-60 UDS 21 / SPN 629 FMI 2
• Bendix EC-60 UDS 22 / SPN 630 FMI 13
• Bendix EC-60 UDS 23 / SPN 630 FMI 13