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Matt
Matt, Mechanical Engineer
Category: Mercedes
Satisfied Customers: 21984
Experience:  BEng hons Mech engineering, in auto industry 22 years
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Hi Matt, Vehicle- Mercedes Benz SL 350 Year --2006 Mileage--61000 Problem---car

Customer Question

Hi Matt,
Vehicle- Mercedes Benz SL 350
Year --2006
Mileage--61000
Problem---car cuts out and wont start.
Symptoms--car turns over but will not start.
All the warning lights go on .
After about 15 minutes car starts but gearbox warning light shows.
Shut down and re start and the gearbox light goes out---car runs ok.
Gearbox operates ok as well as engine.
This has happened twice now within one week.
First time car was stationary just after petrol fill---stationary and second time driving round a corner moving!
Car is serviced as the MB schedule and have had no problems up until now.
Any idea what would cause this?
Thank you
David
Submitted: 2 years ago.
Category: Mercedes
Expert:  Matt replied 2 years ago.
Hello David

On any car if you get a check engine light or other fault light this typically means one or more of the sensors has failed or has a faulty connection.

The ECU senses this and may put the car into 'limp home' mode which typically limits the revs and the amount of power available. Usually the car is safe to drive for a short distance as the mode is intended is intended to get you home without incurring any engine damage

The quickest route to repair is to have the car plugged into a diagnostic machine which will read off the fault code stored in the ECU (providing the light is still on at this point) and indicate which sensor has failed or whether the fault is more serious.

You can do a very rough and ready check yourself by unplugging sensors one at a time and seeing if any of them change the driving condition which would indicate the most recently unplugged sensor is the faulty one. This method is not foolproof though and reading a fault code off is the better method.



I'd say you could also check the gearbox oil level but this does require the car to be lifted in the air, ideally on a ramp / lift so its not at angle

it woudl also be worthwhile checking the electrical connections to the gearbox
Matt and other Mercedes Specialists are ready to help you
Customer: replied 2 years ago.
Matt,
Thank you
I will run diagnostic checks.
Does the ECU have a memory of the two
faults that occurred?
A Happy New Year.
Kind regards
David
Expert:  Matt replied 2 years ago.
Hello David

unless the light still on then no the faults are not stored