Safe to driveDrivable, but watch it yourself
J1939 code SPN 811. Below — how the fault is worded at the factory by Bendix ABS/ESP and WABCO ABS/ESC, and what the second half of the code (FMI) means in the standard.
| FMI 2 | ABS Dash Indicator Circuit DTC |
| FMI 5 | Warning Light Relay (E-Frame) ABS WL if grounded. Off if burned out |
| SPN 811 FMI 2811/2 · 811.2 | data erratic or intermittent |
| SPN 811 FMI 5811/5 · 811.5 | current below normal or open circuit |
Safe to drive. Below — how much time you have and what happens if you keep going.
This is an electrical fault: an open, a short or a bad contact in the sensor circuit. The value it measures is most likely fine.
You can drive. But until the circuit is repaired this system runs blind and cannot warn you about a real failure.
Scanner threw several codes at once? Paste the whole list — we will show which one is the root cause and which ones simply followed.