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cwalkerjr21, Auto Mechanic
Category: Dodge
Satisfied Customers: 710
Experience:  Shop training and experience.
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I have a 2007 3500 Dodge Ram with 6.7 Cummins diesel engine.

Customer Question

I have a 2007 3500 Dodge Ram with 6.7 Cummins diesel engine. It will just die while driving. No codes show but low fuel pressure and water in fuel lights will come on right before it quits running. Had new turbo and new computer installed and changed fuel filters but engine still just quits and then can't get it to restart for a period of time. Battery cables looked corroded. Mechanics are stumped. Any ideas?
Submitted: 11 months ago.
Category: Dodge
Expert:  cwalkerjr21 replied 11 months ago.

That corrosion at the batteries is a common cause of a stall no start condition on these trucks. The batteries should be in tip top shape. Check the voltage drop between the positive posts of the batteries. It should be less than 0.2 volts when the alternator is charging. If more than that, replace the cable between the positive posts of the batteries. Check and clean all battery cables at both ends. Load test each battery separately. Check all power feed circuits to the Engine Control Module. Unplug the Camshaft Position sensor just below the injection pump. Check for 5 volts on the Pink/Yellow wire. Check the Black/Gray wire for a good ground. If all OK, scope the Dark Blue/Gray wire. It should have a 0-5 volt square wave pattern when cranking. It is possible any of the 5 volt sensors is shorting out intermittently. It would be best to duplicate the condition and monitor the 5 volt reference voltage to the sensors. If the voltage is low, then start unplugging the sensors one at a time until the 5 volts returns. The sensor that was just unplugged is the bad sensor.