Safe to driveTo the nearest safe stop
J1939 code SPN 629. Below — how the fault is worded at the factory by Bendix ABS/ESP, DAF, Dongfeng, Meritor (ex-WABCO), Renault Trucks, SITRAK and WABCO ABS/ESC, and what the second half of the code (FMI) means in the standard.
Bendix ABS/ESPDAFDongfengMeritor (ex-WABCO)Renault TrucksSITRAKWABCO ABS/ESC
| FMI 2 | ECU (12); ECU (13); ECU (15); ECU (0D); Invalid ESP Configuration |
| FMI 12 | ECU (02); ECU (10); ECU (11); ECU (14); ECU (18); ECU (1A); ECU (1B); ECU (80); ECU (04); ECU (06); ECU (0E); ECU (37); ECU Internal VIN Mismatch |
| FMI 13 | Invalid ABS Configuration |
| FMI 12 | ECU D984 internal fault 2 |
| FMI 12 | Internal ECM malfunction |
| FMI 9 | Safety Controller Communication Faulty |
| FMI 11 | Trap Handler/Trap Set |
| FMI 12 | Pic Wdc/MC Error |
| FMI 14 | Watchdog/Reset Failure |
| FMI 2 | Internal control unit fault (EBS or ABS). Repair: Replace the ABS unit. Clear the fault codes. If the fault persists, replace the EBS unit. |
| FMI 9 | Internal control unit fault (EBS or ABS). Repair: Replace the ABS unit. Clear the fault codes. If the fault persists, replace the EBS unit. |
| FMI 11 | Internal control unit fault (EBS or ABS). Repair: Replace the ABS unit. Clear the fault codes. If the fault persists, replace the EBS unit. |
| FMI 12 | Internal control unit fault (EBS or ABS). Repair: Replace the ABS unit. Clear the fault codes. If the fault persists, replace the EBS unit. |
| FMI 13 | ABS unit internal fault. Repair: Replace the ABS unit. |
| FMI 14 | Fault storage process not completed. Repair: The power relay (R43) or the EECU is faulty. |
| FMI 0 | Real-time counter fault: counts faster or slower than allowed, or does not respond. Scan tool code: P1702. Effect: Torque limited, the engine may shut down. |
| FMI 1 | Read error in the non-volatile memory. Scan tool code: P1703. Effect: Torque limited, the engine may shut down. |
| FMI 4 | ECU internal fault: stack memory overrun. Scan tool code: P1706. Effect: Torque limited, the engine may shut down. |
| FMI 5 | ECU internal fault: irregular switch-off while the engine was running. Scan tool code: P1707. Effect: Torque limited, the engine may shut down. |
| FMI 8 | Error during the initialisation of an external device: no KeepAlive response. Scan tool code: P1701. Effect: Torque limited, the engine may shut down. |
| FMI 31 | COP fault |
| FMI 5 | No Loads Detected |
| FMI 8 | Excessive Slip |
| FMI 9 | Excessive Modulator Activation Time |
| FMI 12 | Internal Error |
| FMI 13 | Accelerometer Out of Range |
| FMI 14 | ECU Mounting, Accelerometer Not Plausible |
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.
That said, the manufacturer flags this code as critical — if in doubt, it is safer to stop and check on the spot.
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.