Mercedes-Benz S400 Hybrid Won't Start

Question by MercedesMedic posted 11 months 3 weeks ago in 2006-2013 (W221)

We are working on a 2010 Mercedes-Benz S400 Hybrid that won't start. The problem seems to be with the power module. Since these modules are so hard to find, we hope to be able to find the root cause of the problem so that we can fix this car.

The fault codes present at this time are:

  • U011000 - Communication with control unit Electric machine A has a malfunction.

  • U011081 - Communication with control unit Electric machine A has a malfunction. Incorrect data were received.

Both these codes are present and the vehicle will not start.

They seem to point to a faulty power module. Where what part of the power module has failed is the bigger question.