SPN 264978 — ABS fault, differential brake valve (Iveco)

Safe to driveDrivable, but watch it yourself

SPN 264978 is a manufacturer number outside the standard J1939 table: different makes can put different things under it. Below — how it is worded by Iveco, and what the second half of the code (FMI) means.

Iveco

FMI 3	ABS fault, differential brake valve (short circuit to battery)
FMI 5	ABS fault, differential brake valve (open circuit)
FMI 6	ABS fault, differential brake valve (short circuit to ground)

What FMI means in J1939

SPN 264978 FMI 3264978/3 · 264978.3	voltage above normal or shorted high
SPN 264978 FMI 5264978/5 · 264978.5	current below normal or open circuit
SPN 264978 FMI 6264978/6 · 264978.6	current above normal or grounded circuit

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

• SPN 264970Right rear modulator fault
• SPN 264973Retarder brake valve
• SPN 264974ABS fault (low voltage / open circuit)
• SPN 264975ABS fault (low voltage / open circuit)
• SPN 264976ABS fault (low voltage / open circuit)
• SPN 264979ABS fault, trailer brake valve
• SPN 264982ABS fault
• SPN 264983ABS fault (warning lamp circuit)
• SPN 265191ABS fault, SAE J1939
• SPN 265211ABS fault (overvoltage)

Scanner threw several codes at once? Paste the whole list — we will show which one is the root cause and which ones simply followed.