stop start button weird fault

[matteb63]

so the eco button on my w212 is green the engine switches off at the lights and then as I remove foot from brake it restarts but almost immediately stops again and clock starts reversing on dash .im not able to restart the car and im stuck at the lights for 10 minutes
after 10 minutes it will restart as normal until following time. this has caused me some really embarrassing moments.replaced the auxiliary battery but there has been no change ..
when it happens ive noticed that if I let the clock spin until it stops ..about two minutes ..im able to restart it..if I try and restart it while clock is spinning it locks out for at least 5-10 minutes and if I try to restart too much it just seems to keep me locked out until I wait the 5-10 minutes
batteries replaced and no change, no fault codes
I don't want to have to turn it off every time I get in the car and more importantly don't want my wifey stuck at the lights for 20 minutes again when she forgets to turn it off
anyone else experience this odd fault?

 

[markjay]

This is odd.

The only thing I can think of is to take the car to an indie with genuine STAR and get them to update all the ECUs on the car that need updating.

Alternatively, you can permanently disable Stop/Start.

 

[Diesel Benz]

..., no fault codes

I guess this means "no fault messages on the instrument cluster"? Anyway, a very odd issue.

 

[richard]

The clock resetting probably means the voltage dropped very low. Check the terminals are tight on the batteries. Disconnect the ground (negative) first, tighten the positive and reinstall the protective cover, reconnect the negative and tighten it.
Could have a faulty battery I suppose. Further than that, needs proper diagnosis with Xentry etc etc