Have Mercedes Questions? Ask a Mechanic for Answers ASAP
Hi my name is ***** ***** I will be happy to assist with this today.In some cases I may need more info to assist better.I apologize for any delay.
This model uses 2 batteries.One in the trunk for all electronics and one under the hood for the starter only.Has he checked the battery in the trunk to see if it is dead or weak at all?
Let me know so we can continue,thanks Pete.
No problem we can continue here.Looking at your info now on this and will respond shortly.
O.k.,the main battery in the trunk has to be charged to a point where there is a good charge of 12 volts or more before the electronics start to work which includes the shifter as this is released electronically.I would continue to charge the battery in the trunk and see if this then resolves the issue with not being able to remove from park.
If this works and the tail light issue is still ocurring, the tail light issue is usually due to a fault with a SAM control unit/ecu at fault needing replaced.I have seen the sam control units fail in the past before needing replaced for this fault here.
You would need to have the fault codes checked using a scan tool or dealers sds machine that will plug in and communicate with all computers in your model to see what codes are set in all computers.Once this is done this will help pinpoint if a sam is faulty needing replaced.The sam's can short out internally causing this issue.
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The car not starting can be related to the light staying on issue here and can still be a SAM at fault needing replaced.I have seen several failures of the SAM units in the past before causing a light to come on and in some cases causing a no start with the vehicle as well.If there is any way you can get the fault codes checked with a fully compatible scan tool that can read all computers in your vehicle this will help.If this is not an option let me know.
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