Bobbyboy Posted July 6, 2021 Share Posted July 6, 2021 Went to take off for the fourth of July and got about 1 block and red stop engine light came on. Turned around and went back to the bus barn. Error code 2636 shows up which says Abnormal Update Rate to the Actuator---the data cable not sending to the ECM. So check a few things then started up again--no light. So took it out on hwy and light came on. WEnt about a mile and light went out; ran about 10 miles and still no light. So I tdurned around and went back to the bus barn. Had lunch then tdried it again. Light came back on; ran for about 10 minutes in place and light went out. Tried again this morning and no light; but it came on after about 10 minutes then would blink off and on every so often. I checked for loose connections from the actuator to the ECM but nada. Not sure what is going on; several suggestions in the Cummins manual but have not gotten any further into it. It appears that it is an intermittent thing--not sure if it is the 12V to the actuator or the data link. Anybody have suggestions?? Bob L, 08 dynasty. P. S. bus has run perfect until this happened. It only sat for about 2 weeks before I tried to take off for the 4th. Link to comment Share on other sites More sharing options...
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