Mercedes Sprinter 906 LWB Recovery Vehicle - EIS Fault Codes

[Bowers]

Hi there
I'm new to this forum and would be grateful for any assistance with the following problem.

My query is concerning a 2011 Mercedes Sprinter 906 LWB Recovery Vehicle (UK Registered).

When the Ignition key is turned, ignition lights come on and the steering lock unlocks straight away.
When the key is turned further (when the engine should crank and start) the engine does not turn.
We have 3 previously working keys however they all behave in the same way.
We have had a reconditioned EIS coded to the vehicle however this also behaves in the same way and has not solved the problem.

The following DTC Codes are present:
90D3 : CAN bus - No CAN message from the control module 'N73 (Electronic Ignition Switch (EIS/EZS) control module)'.
90D2 : CAN bus - No CAN message from the control module 'N73 (Electronic Ignition Switch (EIS/EZS) control module)'.
90D9 : CAN bus - No CAN message from the control module 'N30/4 (ESP control unit)'.
9128 : A1 (Instrument cluster) - Undervoltage shut-off

Could I ask if anyone can advise what may causing this problem please?
Many thanks.

 

[ajlsl600]

Rodent damage to comms wiring? Or just a broke wire/loose plug?
Starter relay?

 

[Bowers]

Rodent damage to comms wiring? Or just a broke wire/loose plug?
Starter relay?

Thank you for these suggestions, I will attempt to identify any such issues and update accordingly.