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SPN 1068 — Brake Signal Sensor #2

Safe to driveDrivable, but watch it yourself

J1939 code SPN 1068. Below — how the fault is worded at the factory by Bendix ABS/ESP, Meritor (ex-WABCO) and SITRAK, and what the second half of the code (FMI) means in the standard.

Bendix ABS/ESPMeritor (ex-WABCO)SITRAK

Bendix ABS/ESP

FMI 2Shorted Brake Demand Sensor (Secondary CKT) Open

Meritor (ex-WABCO)

FMI 2Detection of invalid duty-cycle/pulse-width at PWM signal 2
FMI 4Detection of permanent low level at PWM signal 2
FMI 5Detection of open load at PWM signal 2; Detection of permanent high level at PWM signal 2
FMI 13Failure Detection 'OverEquipped' at PWM signal 2

SITRAK

FMI 12Redundant brake signal lost on the CAN bus. Scan tool code: P0703. Effect: Loss of communication with the modules, some functions are disabled.

What FMI means in J1939

SPN 1068 FMI 21068/2 · 1068.2data erratic or intermittent
SPN 1068 FMI 41068/4 · 1068.4voltage below normal or shorted to ground
SPN 1068 FMI 51068/5 · 1068.5current below normal or open circuit
SPN 1068 FMI 121068/12 · 1068.12faulty device or component
SPN 1068 FMI 131068/13 · 1068.13calibration out of range

Can I keep driving

Safe to drive. Below — how much time you have and what happens if you keep going.

What happens if you keep driving

Time you have: Drivable, but watch it yourself

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.

Nearby: other

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