Engine Coolant Temperature Sensor - Voltage Above Normal
The JD-SPN110-FMI3 (John Deere PowerTech) diesel fault code means: Engine Coolant Temperature Sensor - Voltage Above Normal. This is a moderate severity code.
- Keep driving?
- Yes, but fix soon
- DIY difficulty
- beginner
- Estimated cost
- $90-$200 sensor, $40-$150 harness repair
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Common Symptoms
- Dash reads max temp and fan stays on
- Cold-start derate (ECU thinks it's already hot)
Probable Causes (Ranked by Likelihood)
- Open coolant temp sensor or broken pigtail Very Likely
- ECU connector pin push-out Possible
Step-by-Step Diagnostic Procedure
Ohm sensor across pins -- compare to Deere CTM table (should be a few K-ohms at 25 C).
Back-probe ECU for 5V reference at sensor connector.
Frequently Asked Questions
What is John Deere fault code SPN 110 FMI 3?
On John Deere PowerTech engines, SPN 110 FMI 3 means: Engine Coolant Temperature Sensor - Voltage Above Normal. Moderate code. Keep working cautiously and plan repair.
Can I keep using my John Deere tractor with SPN 110 FMI 3?
Moderate fault -- continue light use, fix at next service. Diagnose with John Deere Service ADVISOR via an EDL v3 / CF3 interface.
How much does it cost to fix John Deere SPN 110 FMI 3?
Repair cost range: $90-$200 sensor, $40-$150 harness repair. 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.
SPN110-FMI3 on Other Platforms
The same code ID appears across other engines, vehicles, and equipment. Diagnostic flow varies by platform — see the matching breakdown: