Code Details
| Display code | SPN 1569 FMI 31 |
|---|---|
| SPN | 1569 |
| FMI | 31 |
| OEM code | None listed |
| Manufacturer | Volvo |
| System | Engine protection / aftertreatment |
| Component | Engine control module �?protection strategy |
| Source address | Unknown or not applicable |
| Severity | high |
| Review status | source backed |
| Source confidence | medium |
| Last reviewed | 2026-06-11 |
Plain-English Meaning
The Volvo D13 EMS reduces engine power when any critical parameter crosses a protective threshold. SPN 1569 FMI 31 confirms the derate is occurring, but the companion fault codes tell you why. Address the companion codes to resolve the derate. On Volvo VNL, VNX, and VHD trucks with the D13, VCADS Pro displays the SCR inducement status and the list of active faults contributing to the derate. The D13 SCR system uses the same SPN 1569 escalation path as the DD15 and ISX15 platforms. After resolving the root cause faults, VCADS Pro performs the aftertreatment reset cycle required to clear the derate and restore full engine power.
SPN 1569 is the Engine Protection Torque Derate parameter in J1939. FMI 31 indicates the derate is currently active on the Volvo EMS platform. The magnitude of the derate depends on which protective limit was crossed. Common triggers on the D13 include SCR inducement reaching the derate stage, high coolant temperature, low oil pressure, and critical DPF soot loading. VCADS Pro provides access to all active codes and protection event history.
Common Symptoms
- Noticeable power reduction during operation
- Possible vehicle speed limitation
- Check engine or engine protection warning active
- Multiple companion fault codes in VCADS
Possible Causes
Possible causes may include the items below. The list is not a parts diagnosis.
- SCR or aftertreatment inducement reaching the derate stage
- High coolant temperature from a cooling system fault
- Low engine oil pressure from oil level or pump issues
- DPF critical soot overload
- Multiple simultaneous faults triggering the protection strategy
First Checks
- Connect Volvo VCADS Pro and review all active fault codes to identify the primary trigger
- Check coolant level, oil level, and DEF quality as quick baseline checks
- Resolve the underlying cause �?SPN 1569 FMI 31 clears when the triggering parameter normalizes
- Do not clear the fault without resolving the root cause
- Use VCADS Pro to view the active fault codes feeding the SPN 1569 inducement derate
- After root cause repair, use VCADS Pro to perform the aftertreatment inducement reset
Can I Keep Driving?
The Volvo D13 is actively derated while this fault is present. If the trigger is a cooling or lubrication issue, continued operation risks engine damage. If aftertreatment-related, the derate deepens with additional distance. Prioritize diagnosis.
Related Codes
Related Lookup Pages
Sources
- Volvo Trucks Tech Info Public Resources Volvo Trucks North America · oem · accessed 2026-06-11 · confidence medium
Source: Volvo Trucks North America, Volvo Trucks Tech Info Public Resources. This page paraphrases factual fields only and is not a substitute for the original document.
Open source - Volvo Trucks / Mack Trucks Technical Support Volvo Trucks North America / Mack Trucks Inc. · oem · accessed 2026-06-10 · confidence medium
Source: Volvo Trucks North America / Mack Trucks Inc., Volvo Trucks / Mack Trucks Technical Support. This page paraphrases factual fields only and is not a substitute for the original document.
Open source - SAE J1939 Standards Collection SAE International · official · accessed 2026-05-05 · confidence medium
Source: SAE International, SAE J1939 Standards Collection. This page paraphrases factual fields only and is not a substitute for the original document.
Open source
FAQ
Is the Volvo D13 derate behavior the same as the Mack MP8?
Yes �?the D13 and MP8 share the same engine platform and control architecture. The protection derate logic is identical; the difference is in the diagnostic tool used to access the system data. VCADS Pro is used for Volvo trucks, and the equivalent Mack diagnostic tool is used for MP8-powered trucks.
Can the Volvo Remote Diagnostics service detect SPN 1569 FMI 31 and alert the fleet manager?
Yes. Volvo Remote Diagnostics transmits active fault codes to the fleet portal in near real time. A fleet manager would see SPN 1569 FMI 31 flagged as a critical fault, which typically triggers an automatic alert to arrange service.
Will clearing SPN 1569 FMI 31 in VCADS without making a repair restore full power on the Volvo D13?
Clearing the fault code temporarily may remove the derate flag, but if the triggering condition is still present, the protection logic will re-activate and the derate will return. The root cause must be identified and resolved for the full engine power to be restored sustainably.