Throttle Actuator Command - Special Instructions
What does JD-SPN3464-FMI14 mean?
The JD-SPN3464-FMI14 (John Deere PowerTech) diesel fault code means: Throttle Actuator Command - Special Instructions. This is a serious severity code.
Common Symptoms
- Intermittent code set on load or vibration
- Relay / actuator not responding as commanded
- Operator display warning icon
Probable Causes (Ranked by Likelihood)
- Corroded weatherpack connector on frame harness Very Likely
- Failed relay or open fuse on the output circuit Likely
- Broken wire at actuator strain relief Likely
- Low battery voltage under crank Possible
Step-by-Step Diagnostic Procedure
Confirm system voltage at key-on >12.4V (or 24V on heavy chassis).
Measure circuit resistance end-to-end; compare against Technical Manual (CTM) spec.
Activate the output through Service ADVISOR and watch for expected current draw.
Inspect for rodent damage at the valve-cover pass-through on row-crop tractors.
Frequently Asked Questions
What is John Deere fault code SPN 3464 FMI 14?
On John Deere PowerTech engines, SPN 3464 FMI 14 means: Throttle Actuator Command - Special Instructions. Serious code -- address promptly to avoid inducement / further damage. S-series combines have a known false-positive SPN 3464 event at shutdown; a dealer calibration (PIP) corrects it.
Can I keep using my John Deere tractor with SPN 3464 FMI 14?
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 3464 FMI 14?
Repair cost range: $60-$280 wiring/relay, $180-$450 module. Dealer labor on large tractors runs $180-$240/hr in 2026.