C-Class (W204) 2008 - 2014: C180K, C200K, C230, C280, C300, C350, C200CDI, C220CDI, C320CDI

Help p2158 u0121

Thread Tools
 
Search this Thread
 
Rate Thread
 
Old Nov 30, 2018 | 04:32 PM
  #1  
C300t4z's Avatar
Thread Starter
Newbie
 
Joined: Nov 2018
Posts: 5
Likes: 0
C300 4matic sport
Help p2158 u0121

2009 Mercedes c300 4matic sport

After driving in heavy rains the next day my check engine Abs Esp and brake lights all illuminated on the dashboard. Also as I’m driving with lights on my cluster goes insane needles drop displaying 0 gas 0 temp 0 speed 0rpms than it’ll start working again. Also get a srs malfunction that comes and goes. I checked all my fuses they seem fine. Checked my battery it’s 12.5 and when car is started 13.5-14.0 so that means battery and alternator is good. I took off all my tires to see if any visable damage to wires or sensors( didn’t see anything wrong). My brake pads still have life left and I also unplugged and replugged my abs module . I have a generic scanner from my old car I got codes p2158 speed sensor”b” and u0121 LOST CONNECTION WITH ABS MODULE. I tired all suggestions I could find online was wondering if anyone knows how to fix this problem. I ordered a icarsoft mb v2.0 that can hopefully tell me what the problem is in detail. But for the meanwhile it’s driving me crazy and I need some help. Thanks forums in advance

so my brake light is on( parking brake isn’t engaged and my brake pads are good) abs light on traction !light on and check engine light and random srs malfunction

Last edited by C300t4z; Nov 30, 2018 at 05:16 PM. Reason: Car name
Reply
Old Nov 30, 2018 | 04:57 PM
  #2  
C300t4z's Avatar
Thread Starter
Newbie
 
Joined: Nov 2018
Posts: 5
Likes: 0
C300 4matic sport
Video

YouTube video of problem
Reply
Old Jan 27, 2020 | 08:04 PM
  #3  
ramise's Avatar
Newbie
 
Joined: Feb 2018
Posts: 3
Likes: 0
09 C63
hey bro have you been able to find the issue ??

Im having the exact same issue
I replace all the ABS sensors nothing and done investing




Originally Posted by C300t4z
2009 Mercedes c300 4matic sport

After driving in heavy rains the next day my check engine Abs Esp and brake lights all illuminated on the dashboard. Also as I’m driving with lights on my cluster goes insane needles drop displaying 0 gas 0 temp 0 speed 0rpms than it’ll start working again. Also get a srs malfunction that comes and goes. I checked all my fuses they seem fine. Checked my battery it’s 12.5 and when car is started 13.5-14.0 so that means battery and alternator is good. I took off all my tires to see if any visable damage to wires or sensors( didn’t see anything wrong). My brake pads still have life left and I also unplugged and replugged my abs module . I have a generic scanner from my old car I got codes p2158 speed sensor”b” and u0121 LOST CONNECTION WITH ABS MODULE. I tired all suggestions I could find online was wondering if anyone knows how to fix this problem. I ordered a icarsoft mb v2.0 that can hopefully tell me what the problem is in detail. But for the meanwhile it’s driving me crazy and I need some help. Thanks forums in advance

so my brake light is on( parking brake isn’t engaged and my brake pads are good) abs light on traction !light on and check engine light and random srs malfunction
Reply
Old Jan 27, 2020 | 10:34 PM
  #4  
C300t4z's Avatar
Thread Starter
Newbie
 
Joined: Nov 2018
Posts: 5
Likes: 0
C300 4matic sport
Solution

Turned out water was getting into the floor boards and corroded some wires, couple of new connectors and good to go
Reply
Old Jan 28, 2020 | 01:52 AM
  #5  
ramise's Avatar
Newbie
 
Joined: Feb 2018
Posts: 3
Likes: 0
09 C63
Originally Posted by C300t4z
Turned out water was getting into the floor boards and corroded some wires, couple of new connectors and good to go

can you please attach a picture for the location so I can take a look on mine

thank you
Reply

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 


You have already rated this thread Rating: Thread Rating: 0 votes,  average.


All times are GMT -4. The time now is 05:18 PM.

story-0
New Electric Mercedes-AMG GT 4-Door Coupe Unveiled: 10 Things You Need to Know

Slideshow: Mercedes-AMG's new electric GT 4-Door Coupe trades combustion for software, synthetic noise, and more than 1,100 horsepower.

By Verdad Gallardo | 2026-05-20 20:08:15


VIEW MORE
story-1
6 Mercedes Models That Did NOT Age Well (But Are Somehow Still Cool)

Slideshow: Not every Mercedes design becomes timeless, some feel stuck in the era they came from.

By Verdad Gallardo | 2026-05-12 18:09:07


VIEW MORE
story-2
Manual Mercedes? 6 Times Sindelfingen Let Drivers Have All The Fun

Slideshow: Yes, Mercedes built manual cars, and some of them are far more interesting than you'd expect.

By Verdad Gallardo | 2026-05-02 12:36:58


VIEW MORE
story-3
Mercedes SLR McLaren 722 S Is Extremely Rare Example Modified by McLaren

Slideshow: A one-of-one U.S.-spec Mercedes-Benz SLR McLaren Roadster became even rarer after a factory-backed transformation at McLaren's headquarters.

By Verdad Gallardo | 2026-04-29 11:19:28


VIEW MORE
story-4
8 Classic Boxy Mercedes Designs That Have Aged Like Fine Wine

Slideshow: Before curves took over, Mercedes mastered the art of the straight line, and some of those shapes still look right today.

By Verdad Gallardo | 2026-04-25 12:05:49


VIEW MORE
story-5
Flawlessly Restored Mercedes 190E Evo II Heads to Auction

Slideshow: The 190E Evolution II shows how a homologation necessity became a six-figure collector icon.

By Verdad Gallardo | 2026-04-22 17:53:47


VIEW MORE
story-6
Electric Mercedes C-Class Unveiled: 11 Things You Need to Know

Slideshow: Mercedes is turning one of its core nameplates electric, and the details show just how serious this shift is.

By Verdad Gallardo | 2026-04-21 13:58:06


VIEW MORE
story-7
Mercedes EQS Gets A Major Update: Everything You Need to Know

Slideshow: Faster charging, longer range, and a controversial steer-by-wire system define the latest evolution of Mercedes-Benz EQS.

By Verdad Gallardo | 2026-04-15 10:35:34


VIEW MORE
story-8
5 Underrated Mercedes-Benz Models That Don't Get the Love They Deserve

Slideshow: These overlooked Mercedes-Benz models never got the spotlight, but they quietly delivered more than most remember.

By Verdad Gallardo | 2026-04-13 19:35:45


VIEW MORE
story-9
Mercedes 300D Has Pushed Well Past 1 Million Miles and It Ain't Stopping

Slideshow: A well-used 1991 Mercedes-Benz 300D with more than one million miles is now looking for a new owner, and it still appears ready for more.

By Verdad Gallardo | 2026-04-10 10:05:15


VIEW MORE