Jspann07

Hi guys, I need some help. Took the sl 550 on a trip. Glad I made it back! She is in the garage. Went to pull her out and give her a bath and she won't budge. Kind of reminds me of my x wife. She is telling me " Service required do not shift gears, visit dealer", she also says "transmission not in P risk of vehicle rolling away". Tried everything on this site then bought an icarsoft. Fault code is P179C49 The control module "direct select" has a malfunction. There is an internal electrical fault. This is ism shift module A80 .Control unit ism-can continental MB part number 0054461910 for a 2015 sl 550. Tried to clear fault with no luck. So my question is, can I buy this part, can I replace this part with some degree of ease? The car is up in the garage and would require a lot to get her to the dealer. Thanks for any help. I can't tell you how much I appreciate this site and want all to know I have saved a lot of time and money by joining.
Joe Spann

crconsulting

Have a look at the link below, very similar

https://mbworld.org/forums/sl-class-...nge-noise.html

check your aux+main battery voltages, history of shifter area (coffee spillage etc…), and ISM
It has been reported that ISM can be damaged from not putting your cars e-brake on when parking on hills.

Jspann07

Wanted to give an update. The car fixed itself. Obviously it was moisture in the cup holder that did it. I simply put an extra, chilled bottle of water in the passenger cup holder. Sad to think that disabled the car for seven days.
Joe

ram_g

Jeepers

crconsulting

Glad your car is driving. 👍
Unfortunately, I’ve never been blessed enough to have an electrical problem fix itself without cropping up later and becoming an intermittent issue. 🙁

Keep us posted if it ever comes back. Hopefully it’s a fluke…