Average Fuel Economy (mpg or L/hr) - Condition Exists
What does JD-SPN185-FMI31 mean?
The JD-SPN185-FMI31 (John Deere PowerTech) diesel fault code means: Average Fuel Economy (mpg or L/hr) - Condition Exists. This is a moderate severity code.
Common Symptoms
- Informational code -- no power loss
- Data-logging / telematics warning on JDLink
Probable Causes (Ranked by Likelihood)
- Stale or missing configuration parameter Likely
- Historical over-range event already resolved Likely
- GPS / CAN broadcast mismatch Possible
Step-by-Step Diagnostic Procedure
Verify current configuration vs. dealer PIP update.
Clear the code; if it does not return after 10 engine hours, consider resolved.
Frequently Asked Questions
What is John Deere fault code SPN 185 FMI 31?
On John Deere PowerTech engines, SPN 185 FMI 31 means: Average Fuel Economy (mpg or L/hr) - Condition Exists. Moderate code -- diagnose soon; continued operation may increase repair scope.
Can I keep using my John Deere tractor with SPN 185 FMI 31?
Moderate fault -- you can usually keep working but expect derate if aftertreatment-related. Diagnose with John Deere Service ADVISOR via an EDL v3 / CF3 interface.
How much does it cost to fix John Deere SPN 185 FMI 31?
Repair cost range: $0-$180 software / operator-guide update. Dealer labor on large tractors runs $180-$240/hr in 2026.