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
A $30 car code reader can't do diesel. The HD7000 reads full-system codes and does parked DPF regen, idle/speed-limit, and service resets from the cab — on everything from a 6.7 Cummins/Power Stroke/Duramax pickup to Class-8 trucks (Detroit, Paccar, CAT, Volvo, Mack, International).
Full-system 6/9/16-pin diesel scan tool for Cummins, Paccar, CAT, Detroit and more — plug-and-play, no subscription. A cheaper way to read heavy-duty codes a basic OBD2 scanner skips entirely.
Affiliate links — we earn a commission at no extra cost to you.
What Are the Symptoms of JD-SPN94-FMI1?
- Crank no start
- Derate at load
What Causes JD-SPN94-FMI1? (Most Likely First)
- Failed lift pump Likely
- Plugged primary filter / suction strainer Very Likely
- Cracked suction hose drawing air Possible
Can I Still Drive with JD-SPN94-FMI1?
No — stop driving. JD-SPN94-FMI1 is rated serious severity. Continuing to drive in this state risks further damage — get it looked at before your next trip.
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.
Mechanics Guide Step-by-step diagnosis
How Do You Diagnose JD-SPN94-FMI1?
Install pressure gauge at test port on filter head; target 4-7 bar per CTM.
Inspect sediment bowl and prescreen.
Sources 2
This page is built from documented references. Verify against your own service info before repair work.
- John Deere Operator's Manual, PowerTech 4.5 L and 6.8 L Tier 2 OEM Diesel Engines, OMRG33324 (Issue 16Feb04), reproduced as a supplement in Genie's telehandler parts library (doc 237949), "Listing of Diagnostic Trouble Codes"printed page 45-26: SPN 94 FMI 01, "Fuel Supply Pressure Extremely Low". This is John Deere's own table for PowerTech 4.5 L and 6.8 L Tier 2 engines; later PowerTech engines were not checked against it.
- Deutz TCD 2.2 L3 Engine Fault Codes table, printed in the Genie SX-135 XC Service and Repair Manual, Part No. 1263383GT, April 2023printed page 164: SPN 94 FMI 1 (DTCs 725/726), "Low fuel pressure system, warning threshold exceeded" and "Low fuel pressure, shut off threshold exceeded". The table is that engine maker's; it establishes what the J1939 SPN-FMI pair means, not that a John Deere display shows it.
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:
Which Vehicles Commonly Get JD-SPN94-FMI1?
- 2014+ John Deere 6R Series tractors
- 2015+ John Deere 7R Series tractors
- 2015+ John Deere 8R / 8RT Series tractors
- 2015+ John Deere 9R / 9RT / 9RX Series tractors
- 2015+ John Deere S670 / S680 / S690 combines
- John Deere S770 / S780 / S790 combines
- John Deere 544/644/724 wheel loaders (construction)
- John Deere 310/410 backhoes
Explore More
Was this helpful?
Send this to whoever is fixing the truck — your tech, or the person asking what the fault means.