Safe to driveTo the nearest safe stop
J1939 code SPN 802. Below — how the fault is worded at the factory by Bendix ABS/ESP, Renault Trucks and WABCO ABS/ESC, and what the second half of the code (FMI) means in the standard.
Bendix ABS/ESPRenault TrucksWABCO ABS/ESC
| FMI 3 | PMV Common Shorted to Voltage |
| FMI 4 | PMV Common Shorted to Ground |
| FMI 2 | Short circuit on the EBS unit power outputs, or lost ground on part of the ABS unit functions. Repair: Check the module inlet and outlet for air leaks. Trailer module X3/3, X3/6, X3/9, X3/12. Front module X3/2, X3/5, X3/8, X3/11. Rear module (axles) X4/2, X4/8, X4/11, X4/14. Rear module (axle) X4/4, X4/7, X4/10, X4/13. If the fault persists, replace the EBS unit. Check the continuity of the ABS unit wiring (X1/10, X1/11, X1/12). If the fault persists, replace the ABS unit. |
| FMI 3 | Lost ground on part of the ABS unit functions (with ASR), or the unit ground shorted (without ASR). Repair: Check the continuity of the ABS unit wiring (X1/10, X1/11, X1/12). Check the continuity of the ABS unit wiring (X1/10, X1/11, X1/12). If the fault persists, replace the ABS unit. |
| FMI 4 | ABS unit: some functions faulty on the ground side (with ASR fitted). Repair: Check the continuity of the ABS unit wiring (X1/10, X1/11, X1/12). If the fault persists, replace the ABS unit. |
| FMI 12 | ABS unit internal fault. Repair: Replace the ABS unit. |
| FMI 4 | Supply Voltage is too Low |
| FMI 5 | ECU Central Ground Open Circuit |
| FMI 7 | Internal Voltage Supply |
Safe to drive. Below — how much time you have and what happens if you keep going.
The electrical system is not holding voltage. While the engine runs the alternator carries it; shut it off and you may not restart.
Next the lights go, then modules start dropping out and false codes appear all over the truck. Get to somewhere with help without shutting the engine down.
Check the battery terminals and earth strap — corrosion and loose clamps throw false codes all over the truck. Running voltage should be 27–29 V.
Scanner threw several codes at once? Paste the whole list — we will show which one is the root cause and which ones simply followed.