DRV8824 VCP vs. VM voltage

Hi,

My customer has a problem with DRV8824 in their system.

There are multiple DRV8824s on a board and motors in the system. One channel of the motors does not work and output from the DRV8824 is different from the others.

I asked the customer to check VCP voltage, then the result was...

VM = 24 V,  VCP = 12.5 V  for both of the problematic channel and no-problem channels.    

 VCP is about 12V less than VM. It is my understanding that VCP should be 10-12V "above" VM, but it is not on the customer's board.

 What can be a cause of this situation (12 V less than VM) ?  

  Please advise.

Best regards,

Rak