Car Dies at a stop
06-06-2021, 02:55 PM
#1
MBWorld Fanatic!
Thread Starter
Car Dies at a stop
Hello,
Thought I'd post in other forums because I only got a few relies in the W212 forum. I have a stock 2014 E63s with about 60K miles on the clock. I've had random but continuing issues where the car dies at a stop. I have SDConnect with Xentry, and have pulled codes several times. The only thing the pops up is a B1F8D14, "The lower sensor of the rear switching module has a malfunction. There is a short circuit to ground or an open
circuit."
In an attempt to isolate, via Vediamo, the ECO Stop/Start function was permanently shut off because it first seemed as if the dying only happened when in ECO mode. Problem still exists. I know there is a "Relay Starter-Alternator Backup Battery" (A0009822023) that may be involved. A Google search of the code points to this site: Autologic Live: Electrical fault malfunction on Mercedes C-Class - autotechnician - servicing the independent workshop. Not sure it relates.
Any ideas of what might be causing this? Also anyone know what the "lower sensor of the rear switching module" is? Seems odd that the car doesn't throw a code when the car dies unexpectedly.
Thanks,
Joe
Thought I'd post in other forums because I only got a few relies in the W212 forum. I have a stock 2014 E63s with about 60K miles on the clock. I've had random but continuing issues where the car dies at a stop. I have SDConnect with Xentry, and have pulled codes several times. The only thing the pops up is a B1F8D14, "The lower sensor of the rear switching module has a malfunction. There is a short circuit to ground or an open
circuit."
In an attempt to isolate, via Vediamo, the ECO Stop/Start function was permanently shut off because it first seemed as if the dying only happened when in ECO mode. Problem still exists. I know there is a "Relay Starter-Alternator Backup Battery" (A0009822023) that may be involved. A Google search of the code points to this site: Autologic Live: Electrical fault malfunction on Mercedes C-Class - autotechnician - servicing the independent workshop. Not sure it relates.
Any ideas of what might be causing this? Also anyone know what the "lower sensor of the rear switching module" is? Seems odd that the car doesn't throw a code when the car dies unexpectedly.
Thanks,
Joe
06-08-2021, 10:24 PM
#2
Super Member
Hello,
Thought I'd post in other forums because I only got a few relies in the W212 forum. I have a stock 2014 E63s with about 60K miles on the clock. I've had random but continuing issues where the car dies at a stop. I have SDConnect with Xentry, and have pulled codes several times. The only thing the pops up is a B1F8D14, "The lower sensor of the rear switching module has a malfunction. There is a short circuit to ground or an open
circuit."
In an attempt to isolate, via Vediamo, the ECO Stop/Start function was permanently shut off because it first seemed as if the dying only happened when in ECO mode. Problem still exists. I know there is a "Relay Starter-Alternator Backup Battery" (A0009822023) that may be involved. A Google search of the code points to this site: Autologic Live: Electrical fault malfunction on Mercedes C-Class - autotechnician - servicing the independent workshop. Not sure it relates.
Any ideas of what might be causing this? Also anyone know what the "lower sensor of the rear switching module" is? Seems odd that the car doesn't throw a code when the car dies unexpectedly.
Thanks,
Joe
Thought I'd post in other forums because I only got a few relies in the W212 forum. I have a stock 2014 E63s with about 60K miles on the clock. I've had random but continuing issues where the car dies at a stop. I have SDConnect with Xentry, and have pulled codes several times. The only thing the pops up is a B1F8D14, "The lower sensor of the rear switching module has a malfunction. There is a short circuit to ground or an open
circuit."
In an attempt to isolate, via Vediamo, the ECO Stop/Start function was permanently shut off because it first seemed as if the dying only happened when in ECO mode. Problem still exists. I know there is a "Relay Starter-Alternator Backup Battery" (A0009822023) that may be involved. A Google search of the code points to this site: Autologic Live: Electrical fault malfunction on Mercedes C-Class - autotechnician - servicing the independent workshop. Not sure it relates.
Any ideas of what might be causing this? Also anyone know what the "lower sensor of the rear switching module" is? Seems odd that the car doesn't throw a code when the car dies unexpectedly.
Thanks,
Joe
06-09-2021, 08:19 AM
#3
MBWorld Fanatic!
Thread Starter
I know that one of the first signs of the ECO mode not activating is a dying Auxiliary battery in the W166. This also causes the vehicle to not shift into gear either the worse the battery gets. I can’t say I’ve heard of the aux battery causing the vehicle to die at stop. You might want to try and change it out as it’s not as difficult to access in the W212 as it is in W166. It’s also not an expensive item.
https://youtu.be/tBEkLqrxI58
https://youtu.be/tBEkLqrxI58
Thanks,
Joe
06-11-2021, 08:08 AM
#4
Super Member
That's disappointing to hear. Unfortunately, the E63 M157 forum is probably the most active group regarding the M157 engine. There are a small amount of active members within the W166 AMG group - I hope someone can help you pinpoint the issue.
Good luck!
Good luck!
06-11-2021, 09:55 AM
#5
MBWorld Fanatic!
Thread Starter
