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sprinkles08, Chrysler/Dodge/Jeep master tech
Category: Dodge
Satisfied Customers: 22405
Experience:  ASE Master and Advanced Certified, Chrysler/Dodge/Jeep Master Certified, Trans and Hybrid Specialist
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What cause 2007 dodge 3500 not to start cut it off and it

Customer Question

what cause 2007 dodge 3500 not to start cut it off and it will not start back change out the fuel pump not hearing anything on the fuel pump what do I need to check next.
JA: Have you ever replaced the fuel pump, or is this the original?
Customer: yes I pit a new one in last night.
JA: What is the make/model of your car?
Customer: 2007 dodge 3500 6.7 diesel.
JA: Are you fixing your B3500 yourself? What have you tried so far?
Customer: just change out the fuel pump just wronding if it could be the emc.
JA: Anything else you want the mechanic to know before I connect you?
Customer: what do need to look at.
Submitted: 6 months ago.
Category: Dodge
Expert:  sprinkles08 replied 6 months ago.

Hello and welcome to JustAnswer!

There are several things that could be preventing the transfer pump from running. It isn't common but very possible that the ECM has failed or it may be down due to a loss of power or ground.

Do the fuel gauge and voltmeter come up with the key on or stay down?

Have you checked for communication with the ECM using a scan tool?

Customer: replied 6 months ago.
the fuel gauge stay up both stay up I had it scan and had a code u0100 in ecm failer.
Expert:  sprinkles08 replied 6 months ago.

U0100 sets in other modules when the ECM does not communicate. The ECM is indeed down then. If fuses are good then it's powers and grounds are going to need to be tested, the sensor ground circuit checked for a short to voltage and the reference voltage circuit checked for a short to ground. If all is ok then the ECM can be condemned.