What causes no crank and u0100 lost communication with ECM?

What causes no crank and u0100 lost communication with ECM?

All the trouble was caused by a mouse chewing through some wires under the battery and fuse box. I was just going to say to check the fuse box under the hood. Mine has rattled itself loose twice. Bolted it back down after inspecting for damage and everything went back to normal.

How can I test if the ECM is working or dead?

How can I test if the ECM is working or dead? Connecting an OBD-II scanner gives the code U0100 Lost Communication With ECM/PCM “A”. Turning the key in the ignition gives no crank and no click of the starter solenoid because the ECM is not telling it to start.

What does no start no crank no click mean?

If you have a late model GM vehicle and turn the key only to hear nothing, you’ll most likely think you have a dead battery—and you may. But a no start, no crank, no click condition can be far more involved than that. In the old days, power flowed through the ignition switch and down to the starter solenoid. Not anymore.

Why is there no crank and no click on starter solenoid?

Connecting an OBD-II scanner gives the code U0100 Lost Communication With ECM/PCM “A”. Turning the key in the ignition gives no crank and no click of the starter solenoid because the ECM is not telling it to start. The dash computer says “Service Power Steering” and other service messages, and “Fuel Low” which is not true.

What do I need to know about no start no crank?

Audio Amplifier, BCM, DDS, DPM, DRR, Object, Alarm Module, PDS, Radio, RCDLR, SDM, TDM and U – 0140 is telling me all these modules lost communication with the BCM- Body Control Module The first thing I would do when I get A vehicle like this is to check power and grounds to the BCM, You see with out the BCM working nothing is going to work.

All the trouble was caused by a mouse chewing through some wires under the battery and fuse box. I was just going to say to check the fuse box under the hood. Mine has rattled itself loose twice. Bolted it back down after inspecting for damage and everything went back to normal.

When does the BCM stop communicating with other modules?

If this situation happens, the BCM will not start communicating with other modules again until the key is out of the ignition and the BCM has timed out (approximately 20 minutes). Typically the customers complaint will be intermittent and usually occur when driving over bumps/rough roads.

How can I test if the ECM is working or dead? Connecting an OBD-II scanner gives the code U0100 Lost Communication With ECM/PCM “A”. Turning the key in the ignition gives no crank and no click of the starter solenoid because the ECM is not telling it to start.