2014 SL500 44k miles,wheel speed sensor fault and going into a severe limp mode

[pomm001]

My SL has been standing for about 4 weeks, without a battery keeper on it.

I decided to see if it would start, it did so and was going to give it a little run.
All was good, was half expecting to have low voltage triggering all of the warning lights but all good, about 2 miles into the journey, the ESR and all connected systems flashed up, and the vehicle quite quickly went into a very severe limp type mode, no power and about 20 mph max.
I pulled over and restarted but was still the same, the running was bad, heavy misfire and almost no throttle actuation.
Manged to coax it home, put my icarsoft scanner on and came up with LHS front wheel sensor fault, i cleared this and looked at live data and let the car roll on my drive
clearly LHS front showed no signal, so will get that replaced.

My question is on my other Mercedes vehicles ( C350 & A class ) when a wheel sensor has gone down, the car behaves normally other that the dash lights are on, anyone have experience if the SL should be different? or is it coincidental or another issue, maybe a question for an indy .
I will get a new OE sensor and have put the battery on charge and see how it is after

Out of interest i checked the battery voltage at the time i checked the wheel sensor and it was down to 11.7 volt, when i put the car away a few weeks ago all was perfect

 

[Uncle Benz]

ML’s also go into a serious limp mode when a wheel sensor goes down. It can be difficult to pull away from standstill too.

 

[pomm001]

ML’s also go into a serious limp mode when a wheel sensor goes down. It can be difficult to pull away from standstill too.

I think you’re right !

Ive had another look

I hadn’t noticed before but the engine MIL light was on too, i recorded the code from the ECU and it said something about torque control, i cleared this and went for a short drive and in about half mile it went into serious limp again, looking a bit closer at the code on the second screen it said inputs not found
(wheel sensor) so i guess its related, like you say when it goes down its almost non driveable.
Hopefully replacing the sensor will sort it out

 

[ajlsl600]

ML’s also go into a serious limp mode when a wheel sensor goes down. It can be difficult to pull away from standstill too.

Try impossible my ml parking brake would not clear until a kind chap. Old spanner drove over and lent me his icarsoft. . Shxxe design primarily to fill benz coffers.

 

[pomm001]

My SL has been standing for about 4 weeks, without a battery keeper on it.

I decided to see if it would start, it did so and was going to give it a little run.
All was good, was half expecting to have low voltage triggering all of the warning lights but all good, about 2 miles into the journey, the ESR and all connected systems flashed up, and the vehicle quite quickly went into a very severe limp type mode, no power and about 20 mph max.
I pulled over and restarted but was still the same, the running was bad, heavy misfire and almost no throttle actuation.
Manged to coax it home, put my icarsoft scanner on and came up with LHS front wheel sensor fault, i cleared this and looked at live data and let the car roll on my drive
clearly LHS front showed no signal, so will get that replaced.

My question is on my other Mercedes vehicles ( C350 & A class ) when a wheel sensor has gone down, the car behaves normally other that the dash lights are on, anyone have experience if the SL should be different? or is it coincidental or another issue, maybe a question for an indy .
I will get a new OE sensor and have put the battery on charge and see how it is after

Out of interest i checked the battery voltage at the time i checked the wheel sensor and it was down to 11.7 volt, when i put the car away a few weeks ago all was perfect

Update

I was going to swap over the sensors to confirm it was it was the sensor and not something else, but after calling my local MB dealer who had 1 in stock decided not to bother.
Removed the inner wing cover and replaced the sensor , put it all back together and plugged in my scan tool and checked live data just rolling backawards on my drive. The SRS warning did not go out and its not 'erasable' so took it for a drive and after less that 50 yards it went out, guessing it takes a few samples of data and if all in the window switches the light off.
So all ended well, I am a bit supprised that loosing a front wheel sensor essentially renders the vehicle inop, all my other MB cars if this has happened just have the warning lights up ..........
Anyway its done now, need to check my recovery cover as if it happened on teh motorway it would be a trailer job.
The upside is the sensor from my MB dealer was a few pennies short of £22.00, i may as well get a spare just in case.

 

[ajlsl600]

Update

I was going to swap over the sensors to confirm it was it was the sensor and not something else, but after calling my local MB dealer who had 1 in stock decided not to bother.
Removed the inner wing cover and replaced the sensor , put it all back together and plugged in my scan tool and checked live data just rolling backawards on my drive. The SRS warning did not go out and its not 'erasable' so took it for a drive and after less that 50 yards it went out, guessing it takes a few samples of data and if all in the window switches the light off.
So all ended well, I am a bit supprised that loosing a front wheel sensor essentially renders the vehicle inop, all my other MB cars if this has happened just have the warning lights up ..........
Anyway its done now, need to check my recovery cover as if it happened on teh motorway it would be a trailer job.
The upside is the sensor from my MB dealer was a few pennies short of £22.00, i may as well get a spare just in case.

I recently has same issue on my ml250 except my sensor was 137£!! In my case park brake wud not release either. Shxxe design.