6/12/2025 4:06 PM
We have 2018 Toro GM4000D rotary mower that has started to throw error code: Check engine SPN:522596 FMI:9. We have already replace the main wiring harness, a computer and a key switch, to no avail. Will run maybe 5 minutes and throw the error code and it puts the engine in to safe mode. We have one in the Parks department doing the same thing. We think we know the code means the computers have interrupted commination with each other. Do not know what our best next option. Have reach out to Toro thru our dealer for help. No answer as of now.
Wondering if anybody else is having this problem.