Fuel Supply (Lift) Pressure - Below Normal (Most Severe)
The JD-SPN94-FMI1 (John Deere PowerTech) diesel fault code means: Fuel Supply (Lift) Pressure - Below Normal (Most Severe). This is a serious severity code.
- Keep driving?
- No -- stop driving
- DIY difficulty
- intermediate
- Estimated cost
- $300-$750 lift pump, $35-$120 filter kit
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Common Symptoms
- Crank no start
- Derate at load
Probable Causes (Ranked by Likelihood)
- Failed lift pump Likely
- Plugged primary filter / suction strainer Very Likely
- Cracked suction hose drawing air Possible
Step-by-Step Diagnostic Procedure
Install pressure gauge at test port on filter head; target 4-7 bar per CTM.
Inspect sediment bowl and prescreen.
Frequently Asked Questions
What is John Deere fault code SPN 94 FMI 1?
On John Deere PowerTech engines, SPN 94 FMI 1 means: Fuel Supply (Lift) Pressure - Below Normal (Most Severe). Serious code -- address promptly to avoid inducement / further damage.
Can I keep using my John Deere tractor with SPN 94 FMI 1?
Serious fault -- you can move the machine to a shop but don't run it under load. Diagnose with John Deere Service ADVISOR via an EDL v3 / CF3 interface.
How much does it cost to fix John Deere SPN 94 FMI 1?
Repair cost range: $300-$750 lift pump, $35-$120 filter kit. Dealer labor on large tractors runs $180-$240/hr in 2026.
Sources
This page is built from documented references. Verify against your own service info before repair work.
SPN94-FMI1 on Other Platforms
The same code ID appears across other engines, vehicles, and equipment. Diagnostic flow varies by platform — see the matching breakdown: