John Deere Error Code ECU 000094.16 — What It Means and How to Fix It
Applies to: All Tier 4 Interim and Tier 4 Final JD engines, 5E/5M/5R Series with T4 engines, 6M/6R Series, 7R/8R/9R Series, S Series Combines
Replace fuel filters if they haven't been changed recently. Check for a kinked fuel return line. If filters are fresh, the fuel pressure sensor may be faulty.
Low-Pressure Fuel Supply — Pressure Moderately High
The fuel pressure in the low-pressure supply circuit is reading higher than the expected range. This can indicate a restriction in the fuel return line, a faulty fuel pressure regulator, or a sensor issue. The ECU will derate power to protect the fuel injection system.
Repair difficulty
DIY — Basic toolsRepair time
15 min
Dealer cost
$200-400
What to check first
- 1
Check fuel level and drain the fuel/water separator if your model has one
- 2
Replace both fuel filters (primary water separator and secondary fine filter) — this is the fix 60% of the time
- 3
Trace the fuel return line from the engine back to the tank looking for kinks, pinches, or damage
Likely causes
- 1
Clogged fuel filter(s)— Most likely
DIYThe single most common fix for fuel pressure codes on Tier 4 engines. Replace both filters.
- 2
Contaminated fuel (water, sediment, algae growth)— Most likely
DIYCommon in humid climates. Drain the water separator. If fuel looks cloudy, the tank may need draining.
- 3
Blocked or kinked fuel return line— Possible
DIYA kinked return line causes pressure to build. Visual inspection along the full length of the line.
- 4
Fuel pressure regulator failure— Less common
DIYLocated on or near the fuel filter housing on most models. Stuck or failed regulator allows pressure to rise.
- 5
Faulty fuel pressure sensor— Less common
DIYIf filters are fresh and return line is clear, the sensor itself may be reading incorrectly.
Parts needed
Primary fuel filter (water separator)
OEM: RE541922$35
Varies by engine. Change every 500 hours or annually.
Search for this part →Secondary fuel filter
OEM: RE525523$25
Always change with the primary filter.
Search for this part →Fuel pressure sensor (low-pressure)
OEM: RE542461$100
Model-specific. Only replace if filters and return line check out.
Search for this part →
Tools needed
- Filter wrench or strap wrench
- Drain pan
- Clean rags
- Fuel-safe container (for draining water separator)
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Pro tip
Always keep fuel tank full when parking the tractor — this minimises condensation inside the tank. And change your filters on schedule, not when they cause problems.