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SPN 520521 — factory code Meritor (ex-WABCO) and SITRAK

Safe to driveDrivable, but watch it yourself

SPN 520521 is a manufacturer number outside the standard J1939 table: different makes can put different things under it. Below — how it is worded by Meritor (ex-WABCO) and SITRAK, and what the second half of the code (FMI) means.

Meritor (ex-WABCO)

FMI 3Failure detection 'ShortUb' at AbsGround (Drive Axle)
FMI 4Failure detection 'ShortGnd' at AbsGround (Drive Axle)

SITRAK

FMI 2Poor DEF quality: driver inducement warning. Scan tool code: P1076. Effect: Torque limited, MIL on, power may drop to 60%.

What FMI means in J1939

SPN 520521 FMI 2520521/2 · 520521.2data erratic or intermittent
SPN 520521 FMI 3520521/3 · 520521.3voltage above normal or shorted high
SPN 520521 FMI 4520521/4 · 520521.4voltage below normal or shorted to ground

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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