John Deere Engines SPN1568FMI2 Fault Code: Torque Curve Selection Invalid
Also called Torque Curve Selection CAN Message Error, Torque Curve Selection Error, Torque Curve Selection Invalid or Missing (750J Crawler Only)
Torque Curve Selection Invalid · ai-assisted, editor-reviewed · Last updated 2026-07-13
TL;DR
SPN 1568 FMI 2 (also shown as DTC 001568.02 or, on some machines, DTC 001569.09) means the engine ECU either got no torque curve selection message over CAN from another controller, or the message it got was invalid. The engine keeps running, but the ECU falls back to a default torque curve, which on some applications is a lower power curve.
Medium severity. The engine does not shut down. The ECU substitutes a default torque curve and keeps running, but that default may be a reduced power curve, so machine performance can drop until the fault is fixed.
What does John Deere Engines error code SPN1568FMI2 mean?
This code is about a network message, not a physical sensor. The engine ECU is built to run on more than one torque curve, and it depends on another controller on the machine to tell it, over the CAN data network, which curve to use.
SPN 1568 FMI 2 sets when that message either never arrives or arrives but does not make sense to the ECU. Since the ECU cannot confirm which curve it should run, it protects itself by switching to a default torque curve so the engine keeps operating.
Depending on the machine, that default curve may deliver less power than the curve the operator expects, which is often the first symptom noticed in the field: the machine feels weaker or slower even though no warning light stops work.
Common causes of SPN1568FMI2
- Bad ECU, especially if no other CAN-related fault codes are active or stored
- Other CAN-related codes on the machine, including a CAN Bus Error code, which can cause or accompany this fault
- Invalid or missing torque curve selection data sent from another controller over the CAN network
- Wiring and terminal problems in the CAN circuit or connectors feeding the ECU
How to troubleshoot John Deere Engines SPN1568FMI2: first checks
- Connect a diagnostic tool (DST or Service ADVISOR) with ignition ON and engine OFF, then read all fault codes, not just this one
- Check whether a CAN Bus Error code is active; if so, work that code's diagnostic procedure first since it can be the root cause
- Check every other controller on the machine for active or stored CAN-related fault codes; if any are found, follow that controller's diagnostic procedure before touching the ECU
- Inspect CAN wiring, connectors, and terminals for corrosion, looseness, or damage
- If no other CAN or vehicle-related fault codes are found anywhere on the machine, the ECU itself is the listed cause and should be replaced and the system retested
How the code clears
No separate clearing step is listed beyond fixing the root cause. Once the wiring, other controller, or ECU issue is corrected and no other CAN-related codes remain, retest the system to confirm the code does not return.
Frequently asked questions
What does SPN 1568 FMI 2 mean on a John Deere engine?
It means the engine's ECU did not receive a valid torque curve selection message over the CAN network from another controller. The ECU cannot confirm which torque curve to run, so it switches to a default curve.
Can I keep operating the machine with this code active?
The engine keeps running because the ECU substitutes a default torque curve. However, that default may be a lower power curve depending on the application, so expect reduced performance until the fault is fixed.
Is this the same as DTC 001569.09?
On some applications, this same condition is displayed as DTC 001569.09 for Torque Curve Selection Invalid instead of SPN 1568 FMI 2. Treat it with the same diagnostic steps.
Does a CAN Bus Error cause this code?
It can. If a CAN Bus Error code (DTC 000639.13) is active at the same time, that should be diagnosed first, since it can be the underlying reason the torque curve message never arrives or arrives invalid.
Do I need to replace the ECU for this fault?
Only if no other stored or active CAN-related or vehicle-related fault codes are found on any controller in the machine. In that case, a bad ECU is the listed cause, and it should be replaced and retested.
What should a technician check first?
Start by reading all fault codes on all controllers with a diagnostic tool, not just this one code. Check wiring and terminals in the CAN circuit, and resolve any other active CAN-related codes before assuming the ECU is bad.