SL/R231: Low Voltage can’t figure out
Thread Starter
Newbie
Joined: Nov 2021
Posts: 13
Likes: 2
SL 550
Low Voltage can’t figure out
Hello,
I have a P0562 code. I have replaced the alternator, the AUX battery and the starter battery is good. I can’t figure out why the low voltage persist. Right headlight occasionally flickers at stoplights after short in town driving. Any help would be appreciated. Thanks!
I have a P0562 code. I have replaced the alternator, the AUX battery and the starter battery is good. I can’t figure out why the low voltage persist. Right headlight occasionally flickers at stoplights after short in town driving. Any help would be appreciated. Thanks!
Trending Topics
MB World Stories
The Best of Mercedes & AMG
6 Mercedes Models That Did NOT Age Well (But Are Somehow Still Cool)
Verdad Gallardo
Manual Mercedes? 6 Times Sindelfingen Let Drivers Have All The Fun
Verdad Gallardo
Mercedes SLR McLaren 722 S Is Extremely Rare Example Modified by McLaren
Verdad Gallardo
8 Classic Boxy Mercedes Designs That Have Aged Like Fine Wine
Verdad Gallardo
Flawlessly Restored Mercedes 190E Evo II Heads to Auction
Verdad Gallardo
Electric Mercedes C-Class Unveiled: 11 Things You Need to Know
Verdad Gallardo
Mercedes EQS Gets A Major Update: Everything You Need to Know
Verdad Gallardo
5 Underrated Mercedes-Benz Models That Don't Get the Love They Deserve
Verdad Gallardo
Mercedes 300D Has Pushed Well Past 1 Million Miles and It Ain't Stopping
Verdad Gallardo
Newbie
Joined: Nov 2020
Posts: 1
Likes: 0
From: Naples, FL
2013 SL550
Are you in key FOB hell?
When you are home, srore all working key FOBs at lease 30 ft away from the car and behind a masonry wall if possible. When I brought my SL550 home from purchase at our local dealer, I hoticed that my CTek battery minder was showing low charge after sitting for a couple days without driving and this with a brand new Merc battery. As long as the zillion+1 system modules, ROM computers and special sensors reporting to the ECU can communicate with FOBs, they just sleep and continue to draw juice from the batteries. Also, get a CTek smart charger and keep it hooked up when not using your SL for a few days to make your tee time or hang at the yacht club. These cars love fully charged batteries and all systems seem to work better when you leave the garage after being attached to the CTek all night.
Thread Starter
Newbie
Joined: Nov 2021
Posts: 13
Likes: 2
SL 550
When you are home, srore all working key FOBs at lease 30 ft away from the car and behind a masonry wall if possible. When I brought my SL550 home from purchase at our local dealer, I hoticed that my CTek battery minder was showing low charge after sitting for a couple days without driving and this with a brand new Merc battery. As long as the zillion+1 system modules, ROM computers and special sensors reporting to the ECU can communicate with FOBs, they just sleep and continue to draw juice from the batteries. Also, get a CTek smart charger and keep it hooked up when not using your SL for a few days to make your tee time or hang at the yacht club. These cars love fully charged batteries and all systems seem to work better when you leave the garage after being attached to the CTek all night.
MBWorld Fanatic!
Joined: Feb 2021
Posts: 1,419
Likes: 739
From: Nor-Cal
2020 GLC300 -2014 Sl550 - 1997 SL600
Thanks. Not a bad idea. However, I don’t think it’s the key being too close. They are stored a considerable way away. The strange thing is that the voltage on the car now noticeably drops when idling. There is a brand new alternator so it’s not that. I floored it off of a stop light a couple days ago and it is been a lot worse since then.
How are you measuring the voltage drop? Is it the right headlight dimming? Or using your diagnostic scan tool? Does the car start or is it dead after a couple days sitting?
Last edited by crconsulting; Nov 22, 2021 at 02:02 PM.
MBWorld Fanatic!
Joined: Feb 2021
Posts: 1,419
Likes: 739
From: Nor-Cal
2020 GLC300 -2014 Sl550 - 1997 SL600
MBWorld Fanatic!
Joined: Feb 2021
Posts: 1,419
Likes: 739
From: Nor-Cal
2020 GLC300 -2014 Sl550 - 1997 SL600
