I have a 2007 mack cxn613 with the Grey Mack engine in it. The truck was running fine and we had the driver go on vacation for 1 week and when we came back the truck will not start.
It cranks hard but will not turn over... When we crank it White Smoke comes out the exhaust. The only Yellow lightning bolt code we are getting is 2-9 which is a humidity sensor. ( i do not believe this would stop it from starting). We have primed the lines and pulled them while cranking to make sure the pump is working correctly. The batteries are all new and the voltage is good. Im Kinda dead in the water with idea's. Does anyone have a Troubleshooting checklist or ideas for this situation??
Edited by Krazy_Kvin, 11 December 2012 - 10:39 AM.