Engine Oil Temperature - Voltage Above Normal or Shorted to High Source
The JD-SPN175-FMI3 (John Deere PowerTech) diesel fault code means: Engine Oil Temperature - Voltage Above Normal or Shorted to High Source. This is a moderate severity code.
Unverified. We could not confirm this code's definition against freely available manufacturer documentation, so treat the meaning, severity and fix guidance on this page as unconfirmed. Check it against the manufacturer's service information for your exact model and serial range before acting on it. This page is kept out of search engines for that reason, and we are working through this family manual by manual.
- Keep driving?
- Yes, but fix soon
- DIY difficulty
- intermediate
- Estimated cost
- $90-$320 sensor + install
What Are the Symptoms of JD-SPN175-FMI3?
- Fault lamp on operator display
- Possible derate once confirmed active
- Inaccurate dashboard readout for the affected parameter
What Causes JD-SPN175-FMI3? (Most Likely First)
- Failed sensor element or contaminated sensor tip Likely
- Broken, chafed, or corroded sensor harness connector Very Likely
- Open / short to ground between sensor and ECU Possible
- ECU signal input fault (rare) Less Likely
Can I Still Drive with JD-SPN175-FMI3?
Yes, but fix soon. JD-SPN175-FMI3 is rated moderate severity. It is not an immediate stop-driving fault, but it will not clear itself — book the repair rather than ignoring it.
Frequently Asked Questions
What is John Deere fault code SPN 175 FMI 3?
On John Deere PowerTech engines, SPN 175 FMI 3 means: Engine Oil Temperature - Voltage Above Normal or Shorted to High Source. Moderate code -- diagnose soon; continued operation may increase repair scope.
Can I keep using my John Deere tractor with SPN 175 FMI 3?
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 175 FMI 3?
Repair cost range: $90-$320 sensor + install. Dealer labor on large tractors runs $180-$240/hr in 2026.
Mechanics Guide Step-by-step diagnosis
How Do You Diagnose JD-SPN175-FMI3?
Use John Deere Service ADVISOR (CF3/EDL v3) and capture live sensor value vs. expected range.
Back-probe the sensor harness -- verify 5V reference and signal return at the ECU connector.
Swap the sensor with a known-good matching part number and clear the code.
Check CAN data trace for sensor broadcast on J1939 before condemning the ECU.
Sources 1
This page is built from documented references. Verify against your own service info before repair work.
- SAE J1939-73Application Layer: Diagnostics (defines the SPN/FMI fault-identifier framework)
Which Vehicles Commonly Get JD-SPN175-FMI3?
- 2015+ John Deere 7R Series (7210R, 7250R, 7290R, 7310R)
- 2015+ John Deere 8R / 8RT Series (8245R-8370R)
- 2015+ John Deere 9R / 9RT / 9RX Series (9370R-9620R)
- John Deere S670 / S680 / S690 combines
- John Deere S770 / S780 / S790 combines
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