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SPN 4079 — Module trailer control outlet valve (Knorr-Bremse EBS and MAN)

Safe to driveDrivable, but watch it yourself

SPN 4079 is a manufacturer number outside the standard J1939 table: different makes can put different things under it. Below — how it is worded by Knorr-Bremse EBS and MAN, and what the second half of the code (FMI) means.

Knorr-Bremse EBS

FMI 6Module trailer control outlet valve. Short to power supply Ubat
FMI 7Module trailer control outlet valve. Short
FMI 9Module trailer control outlet valve. Faulty devices
FMI 10Module trailer control outlet valve. Open

MAN

FMI 6Module trailer control outlet valve - Short to power supply
FMI 7Module trailer control outlet valve - Short
FMI 9Module trailer control outlet valve - Faulty
FMI 10Module trailer control outlet valve - Open

What FMI means in J1939

SPN 4079 FMI 64079/6 · 4079.6current above normal or grounded circuit
SPN 4079 FMI 74079/7 · 4079.7mechanical system not responding
SPN 4079 FMI 94079/9 · 4079.9abnormal update rate
SPN 4079 FMI 104079/10 · 4079.10abnormal rate of change

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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