Jeffersonville, OH | dodgetruck2 - 1/9/2026 15:17
Getting a fault 121 on trimble Autopilot system, NAV2, v13.75. when looking up fault list is just says mt "gear lever" position, not savy enough to know the terminology it might actually be referring to, I can't believe gear lever is actually what it means?
This is previously controlled by ag leader insight system, which we are currently upgrading to an fm750, however we were getting this fault with the ag leader as well.
Any guidance would be appreciated.
Autopilot system fault code 121 "Gear Lever Parameter Error"
Cause
The Gear Lever parameter sent by the CAT MT steering system has value 14 (error).
Possible failure modes
Error reported by MT steering control module.
Solution
1. Clear the fault code:
a. On the display, check the fault detail.
b. Record the fault code and then select OK.
2. Check the ISO software version.
3. If the fault is still not resolved, contact the tractor dealer.
Looks like that should only be for a Challenger MT tractor...is the Vehicle profile loaded correctly?
Chris |
Trimble Autopilot Fault 121
