SL55/63/65/R230 AMG: ABC can't reset after installing new er hydraulic shocks
Thread Starter
Junior Member
Joined: Oct 2022
Posts: 33
Likes: 1
sl500
ABC can't reset after installing new er hydraulic shocks
i hope it's ok to post here i couldn't find a SL500 thread but i have this predicament i can't get this ABC STOP CAR TOO LOW red message to disappear even though i can manually lift the car and lower it through the ABC buttons
i've changed all four shocks; my rear valve assembly block my front valve block... i can manually adjust height but i can't Level calibration it doesn't take my values (-8,-8,-2,-2) or values that are close
i did a RODEO test which i thought was successful any experience with this? should i go ahead and change sensors now? tandem pump? ABC pressure sensor ?"B4/5" it's on the pressure relief valve behind the left wheel would that do anything ? maybe it's the valve itself or is it my sensors that are faulty? i have attached a few pictures if you can help. thank you.
the car is all over the place i could show the travel sensor page too but it only shows the rear wheels are up !!at their max position or "0"mm"
and the front left is at 60mm and front right at 30mm
shouldnt' they all be 35mm !!!! from the ground or from their home position ?
i've changed all four shocks; my rear valve assembly block my front valve block... i can manually adjust height but i can't Level calibration it doesn't take my values (-8,-8,-2,-2) or values that are close
i did a RODEO test which i thought was successful any experience with this? should i go ahead and change sensors now? tandem pump? ABC pressure sensor ?"B4/5" it's on the pressure relief valve behind the left wheel would that do anything ? maybe it's the valve itself or is it my sensors that are faulty? i have attached a few pictures if you can help. thank you.
the car is all over the place i could show the travel sensor page too but it only shows the rear wheels are up !!at their max position or "0"mm"
and the front left is at 60mm and front right at 30mm
shouldnt' they all be 35mm !!!! from the ground or from their home position ?
Last edited by Fred Rezfield; Aug 4, 2025 at 09:14 PM.
MBWorld Fanatic!
Joined: Feb 2017
Posts: 2,305
Likes: 1,208
From: Baltimore County, MD
'13 s212 63 p30. '06 LX470
Just based on the readings, it looks like the right rear level sensor is not functioning properly, which I’m sure you’ve deduced. It does have some voltage so it’s unlikely to be a wiring or plug issue at first glance. Rodeo is strictly a pressure and valve test imo. You can also test the level sensor thru star, and it will give you the procedure to manually check with a dmm.
Thread Starter
Junior Member
Joined: Oct 2022
Posts: 33
Likes: 1
sl500
thanks for that. it was a mangled height level sensor i replaced it now i PRE measure 27 inches from the wheel arch to the ground i manually bring everything down before height caliberation but still can't save it.
Super Member
Joined: Sep 2021
Posts: 537
Likes: 116
From: Ann Arbor, MI
2004 SL600
There is a ride height calibration function which moves the front suspension up and down as far as it goes, recording that the shock depth sensors go from 0% to 100% and repeats with the rear. While not documented, I suspect that it coordinates the ride height sensor voltages with the shock depth sensors percentages.
Interestingly, my car failed on this function because my rear shocks only went up to 98% and not the required 100%. Therefore the ABC codes would not reset a hard fault. (Yes, I tried on a hoist, checked the shock sensors, etc.)
My solution was to buy a new ABC computer module (about $80 on eBay) and install it. It had a soft fault easily cleared but no hard faults. I think one side of the car rides a bit lower than the other, but no ABC faults in a long time now.
Let us know what functions you are running and what you mean by "still can't save it".
Interestingly, my car failed on this function because my rear shocks only went up to 98% and not the required 100%. Therefore the ABC codes would not reset a hard fault. (Yes, I tried on a hoist, checked the shock sensors, etc.)
My solution was to buy a new ABC computer module (about $80 on eBay) and install it. It had a soft fault easily cleared but no hard faults. I think one side of the car rides a bit lower than the other, but no ABC faults in a long time now.
Let us know what functions you are running and what you mean by "still can't save it".
