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SPN 1056 — Electronic Pressure Control, Trailer Control

Safe to driveDrivable, but watch it yourself

J1939 code SPN 1056. Below — how the fault is worded at the factory by Bendix ABS/ESP, Knorr-Bremse EBS, MAN and Renault Trucks, and what the second half of the code (FMI) means in the standard.

Bendix ABS/ESPKnorr-Bremse EBSMANRenault Trucks

Bendix ABS/ESP

FMI 3Trailer PMV REL Solenoid Shorted to Voltage; Trailer PMV HLD Solenoid Shorted to Voltage
FMI 4Trailer PMV REL Solenoid Shorted to Ground; Trailer PMV HLD Solenoid Shorted to Ground
FMI 5Trailer PMV REL Solenoid Open Circuit; Trailer PMV HLD Solenoid Open Circuit; Trailer PMV CMN Open Circuit
FMI 7PMV Configuration Error

Knorr-Bremse EBS

FMI 3Module trailer control, adjustable max pressure. Not identified

MAN

FMI 3Module trailer control adjustable maximum pressure - Not identified

Renault Trucks

FMI 7Trailer control module pneumatic fault or module internal fault. Repair: Check the air supply pressure, the minimum pressure switches and the pneumatic circuit of the trailer module. Check the parking brake. Clear the fault codes. If the fault persists, replace the trailer brake control module.
FMI 9Trailer control module internal fault, or communication failure between the additional axle module, the EBS unit and the trailer control module. Repair: Check the electrical connections between the EBS unit and the trailer control module (continuity of the 4 wires X3/3, 6, 9, 12). Check the supply of the EBS unit (positive on X1/7, X1/8 and negative on X1/10, X1/12) and of the module (X3/3 and X3/12). Check the fuses that belong to the EBS. Clear the fault codes. If the fault persists, replace the trailer control module.
FMI 11Incompatibility between the trailer control module and the EBS unit. Repair: Check the part numbers of the module and the EBS unit.
FMI 12Trailer control module internal fault. Repair: Clear the fault codes. If the fault persists, replace the trailer control module.
FMI 13Trailer control module internal fault. Repair: Perform the programming. Clear the fault codes. If the fault persists, replace the trailer control module.
FMI 16Trailer control module internal fault. Repair: Clear the fault codes. If the fault persists, replace the trailer control module.

What FMI means in J1939

SPN 1056 FMI 31056/3 · 1056.3voltage above normal or shorted high
SPN 1056 FMI 41056/4 · 1056.4voltage below normal or shorted to ground
SPN 1056 FMI 51056/5 · 1056.5current below normal or open circuit
SPN 1056 FMI 71056/7 · 1056.7mechanical system not responding
SPN 1056 FMI 91056/9 · 1056.9abnormal update rate
SPN 1056 FMI 111056/11 · 1056.11root cause not known
SPN 1056 FMI 121056/12 · 1056.12faulty device or component
SPN 1056 FMI 131056/13 · 1056.13calibration out of range
SPN 1056 FMI 161056/16 · 1056.16above normal — moderate severity

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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