Still having the issue... Truck will run for about 30 minutes then shuts down. Check engine light comes on after start up. I have the Tennant service manual, and I combed through all 200 freaking pages, and not once did it mention anything about the check engine light. And the only thing in the operators manual says to "contact a tennant representative" Which we all know is freaking ****.

Anyone know how to access the trouble codes related to the check engine light?!?!?!