Code Details
| Display code | SPN 412 FMI 0 |
|---|---|
| SPN | 412 |
| FMI | 0 |
| OEM code | None listed |
| Manufacturer | Volvo |
| System | Engine �?EGR system |
| Component | EGR cooler / EGR temperature sensor |
| Source address | Unknown or not applicable |
| Severity | medium |
| Review status | source backed |
| Source confidence | medium |
| Last reviewed | 2026-06-11 |
Plain-English Meaning
The Volvo D13 EGR cooler reduces exhaust gas temperatures before recirculation back into the intake. Elevated post-cooler EGR temperatures mean the cooler is underperforming �?from a bypass valve fault, restricted coolant, or degraded cooler core. Hot EGR gases entering the intake reduce combustion efficiency and can increase NOx production. On Volvo VNL and VHD trucks with the D13, the EGR cooler and EGR valve work together to reduce combustion NOx by recirculating a portion of exhaust into the intake charge. VCADS Pro monitors EGR cooler inlet and outlet temperatures and the EGR flow rate. A partially restricted EGR cooler that allows less than the commanded flow rate to pass will show as below-normal EGR delta T and reduced intake manifold oxygen dilution. This condition causes combustion NOx to rise, which the SCR system may or may not be able to compensate depending on catalyst load.
SPN 412 FMI 0 is EGR Temperature above normal. On Volvo D13 EMS3, VCADS Pro monitors EGR cooler inlet and outlet temperatures, EGR bypass valve position, and coolant temperature. A stuck EGR bypass valve or restricted coolant supply to the cooler are primary causes.
Common Symptoms
- Check engine lamp active on the Volvo instrument panel
- Higher than normal intake temperatures visible in VCADS Pro live data
- Coolant loss or coolant smell if the EGR cooler core has developed an internal leak
- White exhaust smoke if coolant is leaking internally into the exhaust path
- Increased NOx output — may trigger SCR efficiency faults if sustained
Possible Causes
Possible causes may include the items below. The list is not a parts diagnosis.
- EGR bypass valve stuck open
- Restricted coolant flow to EGR cooler
- EGR cooler core degradation
- EGR temperature sensor fault
First Checks
- Connect VCADS Pro and command the EGR bypass valve to open and close — verify that the actual valve position tracks the commanded position
- Monitor EGR inlet temperature versus EGR outlet temperature in VCADS Pro live data — a small differential (less than expected cooling) indicates cooler performance loss
- Inspect coolant level and condition — check for signs of coolant contamination in the exhaust system or exhaust odor in the coolant
- Check coolant flow to the EGR cooler — a restricted coolant passage from scale reduces heat transfer
- If bypass valve tests correctly but EGR temperature is still high, pressure-test the EGR cooler for internal leakage
- Monitor EGR cooler inlet and outlet temperature differential in VCADS Pro to assess cooler heat exchange efficiency
- Check EGR valve position and flow rate in VCADS Pro to confirm commanded EGR percentage is being delivered
Can I Keep Driving?
Typically driveable. Monitor for coolant temperature rise if cooler integrity is suspect.
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 EGR cooler bypass valve sticking a known issue on the Volvo D13?
EGR cooler bypass valve sticking is documented across multiple diesel engine platforms using similar valve designs, including the Volvo D13. Carbon and soot buildup on the valve stem and seat can cause sticking after extended operation in stop-and-go or low-load conditions. VCADS Pro commanded valve cycling can help free minor sticking in some cases. If the valve does not respond to VCADS Pro commands — no change in actual position — replacement is warranted. The D13 EGR bypass valve is accessible without removing the EGR cooler assembly.
Does the Mack MP8 share the same EGR cooler as the Volvo D13?
The Mack MP8 and Volvo D13 share a closely related engine architecture and the EGR cooler assemblies are similar between the two platforms. Specific part numbers may differ by configuration, but the thermal design and diagnostic approach via VCADS Pro are essentially the same.
Can I prevent EGR cooler high-temperature faults on the Volvo D13 through maintenance?
Maintaining proper coolant condition �?correct OAT inhibitor concentration and pH �?reduces internal scaling and corrosion in the EGR cooler passages, which helps maintain heat transfer efficiency. Regular coolant analysis and timely coolant replacement per the Volvo service schedule are the most effective preventive measures.