CEL and DTC Codes After Stage 2 Tune
Thread Starter
Junior Member
Joined: Dec 2016
Posts: 20
Likes: 0
2017 C43 Sedan
CEL and DTC Codes After Stage 2 Tune
So I recently added Weistec DP's and a stage 2 tune on my 2017 C43. I received my ECU back on Saturday. I plugged the ECU in, went for a test drive and everything seemed fine. Later that night while driving home, I received an error messages while on the freeway. The "Active Brake Assist Malfunction" warning popped up and my car lost all power. I was able to pull over, shut the car off and restart to get home. I am not sure if this is related to the tune or just a fluke. I have read this has happened before with a few members and simply needs a software update from MB.
I took the car in yesterday (AutoZone) to have it scanned since the CEL was still on. It is throwing the following 3 codes: P061B (Internal Control Module Torque Calculation Performance), and P0420/P0430 (Cat System Efficiency Bank 1 and 2.) I have read the P061B code has popped up post tune with a few guys on the forum due to receiving a bad file. I am confused by P0420/P0430 since I thought stage 2 would automatically disable/bypass the post-cat O2 sensors. Has anyone experienced this before?
Thanks in advance.
I took the car in yesterday (AutoZone) to have it scanned since the CEL was still on. It is throwing the following 3 codes: P061B (Internal Control Module Torque Calculation Performance), and P0420/P0430 (Cat System Efficiency Bank 1 and 2.) I have read the P061B code has popped up post tune with a few guys on the forum due to receiving a bad file. I am confused by P0420/P0430 since I thought stage 2 would automatically disable/bypass the post-cat O2 sensors. Has anyone experienced this before?
Thanks in advance.
Last edited by heyitsfish; Aug 21, 2017 at 06:57 PM. Reason: added model
Senior Member
Joined: Nov 2005
Posts: 410
Likes: 176
2020 GLC 63
So I recently added Weistec DP's and a stage 2 tune on my 2017 C43. I received my ECU back on Saturday. I plugged the ECU in, went for a test drive and everything seemed fine. Later that night while driving home, I received an error messages while on the freeway. The "Active Brake Assist Malfunction" warning popped up and my car lost all power. I was able to pull over, shut the car off and restart to get home. I am not sure if this is related to the tune or just a fluke. I have read this has happened before with a few members and simply needs a software update from MB.
I took the car in yesterday (AutoZone) to have it scanned since the CEL was still on. It is throwing the following 3 codes: P061B (Internal Control Module Torque Calculation Performance), and P0420/P0430 (Cat System Efficiency Bank 1 and 2.) I have read the P061B code has popped up post tune with a few guys on the forum due to receiving a bad file. I am confused by P0420/P0430 since I thought stage 2 would automatically disable/bypass the post-cat O2 sensors. Has anyone experienced this before?
Thanks in advance.
I took the car in yesterday (AutoZone) to have it scanned since the CEL was still on. It is throwing the following 3 codes: P061B (Internal Control Module Torque Calculation Performance), and P0420/P0430 (Cat System Efficiency Bank 1 and 2.) I have read the P061B code has popped up post tune with a few guys on the forum due to receiving a bad file. I am confused by P0420/P0430 since I thought stage 2 would automatically disable/bypass the post-cat O2 sensors. Has anyone experienced this before?
Thanks in advance.
Thread Starter
Junior Member
Joined: Dec 2016
Posts: 20
Likes: 0
2017 C43 Sedan
They recommended I reset the throttle adaptations and clear the codes... Has anyone gotten the cat efficiency codes with stage 2? I didn't feel the "OMG THIS IS AWESOME" stage 2 power others have described so I am concerned they flashed stage 1 accidentally.
Member
Joined: Dec 2016
Posts: 116
Likes: 14
'17 C43 Coupe
So I recently added Weistec DP's and a stage 2 tune on my 2017 C43. I received my ECU back on Saturday. I plugged the ECU in, went for a test drive and everything seemed fine. Later that night while driving home, I received an error messages while on the freeway. The "Active Brake Assist Malfunction" warning popped up and my car lost all power. I was able to pull over, shut the car off and restart to get home. I am not sure if this is related to the tune or just a fluke. I have read this has happened before with a few members and simply needs a software update from MB.
I took the car in yesterday (AutoZone) to have it scanned since the CEL was still on. It is throwing the following 3 codes: P061B (Internal Control Module Torque Calculation Performance), and P0420/P0430 (Cat System Efficiency Bank 1 and 2.) I have read the P061B code has popped up post tune with a few guys on the forum due to receiving a bad file. I am confused by P0420/P0430 since I thought stage 2 would automatically disable/bypass the post-cat O2 sensors. Has anyone experienced this before?
Thanks in advance.
I took the car in yesterday (AutoZone) to have it scanned since the CEL was still on. It is throwing the following 3 codes: P061B (Internal Control Module Torque Calculation Performance), and P0420/P0430 (Cat System Efficiency Bank 1 and 2.) I have read the P061B code has popped up post tune with a few guys on the forum due to receiving a bad file. I am confused by P0420/P0430 since I thought stage 2 would automatically disable/bypass the post-cat O2 sensors. Has anyone experienced this before?
Thanks in advance.
Thread Starter
Junior Member
Joined: Dec 2016
Posts: 20
Likes: 0
2017 C43 Sedan
Member
Joined: Dec 2016
Posts: 116
Likes: 14
'17 C43 Coupe
Mine threw the torque code - had it confirmed by a dealer in the area as well. I kept it at stock afterwards (we tried like 3-4 different versions of the tune and they were all throwing CELs and putting my car in limp mode at varying frequencies). The weird thing is that the tune was fine for 3-4 months and all of a sudden starting giving me issues.
Junior Member
Joined: Jun 2017
Posts: 34
Likes: 6
From: Delray Beach, FL
2020 AMG C43 Sedan
Reading this is scaring me away from getting a tune. I've read that a few people are getting the CEL and going into limp mode after the Euro Charged tune. Has anyone had any problems with AMR or OE?
Trending Topics
MB World Stories
The Best of Mercedes & AMG
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
10 Most Reliable Mercedes-Benz Models You Can Buy Used
Verdad Gallardo
Junior Member
Joined: Jul 2017
Posts: 56
Likes: 5
C43
I had the same thing happen to me the day before yesterday. I was driving on highway at around 70 miles/hour. All at a sudden car just lost power with ESP light on and CEL.
I have stage 1 tune from. I did not know it was caused by tune when it happened, so I just sent my car to dealership... After it return I will probably flash back to stock and ask for refund. I don't want to risk my safety for the power gain...
I have stage 1 tune from. I did not know it was caused by tune when it happened, so I just sent my car to dealership... After it return I will probably flash back to stock and ask for refund. I don't want to risk my safety for the power gain...
Member
Joined: Dec 2016
Posts: 116
Likes: 14
'17 C43 Coupe
It's almost as if MB sent a wireless update to all the cars... (not sure if that is even a thing). It's weird that no one had issues with their tune for months and then all of a sudden everyone is having the same issue.... 
Member
Joined: Dec 2016
Posts: 116
Likes: 14
'17 C43 Coupe
I did bring my car in for Service A while I still had my tune on it. I was under the impression that the dealer doesn't touch the ECU during service appointments unless they need to (updates aren't required). I had CEL issues with my car/tune well before that but I only got the active brake assist messages after that now that I think about it...
Member
Joined: Oct 2016
Posts: 178
Likes: 41
Mercedes Benz C43 AMG
I am AMR stage 1 and have never had an issue ever! They also warranty the software and your motor, which is very comforting. That would be my tune recommendation hands down.
MBWorld Fanatic!
Joined: Nov 2015
Posts: 1,255
Likes: 154
From: Massachusetts USA
2017 C43 sedan
Member
Joined: Mar 2011
Posts: 93
Likes: 12
From: So Cal
2018 M4 comp cabriolet, 2017 C43 Sedan, (wife)
My wife's C43 sedan had the Active Brake Assist Malfunction light come on a few weeks ago. Our car is NOT tuned. When I took it in to the dealership, they remarked that they had seen a few cars have this problem. They replaced something (can't remember what, since it seemed somewhat common, and was covered under warrantee) and sent us on our way. No problems since then. Possible not related to tune after all?
Member
Joined: Dec 2016
Posts: 116
Likes: 14
'17 C43 Coupe
My wife's C43 sedan had the Active Brake Assist Malfunction light come on a few weeks ago. Our car is NOT tuned. When I took it in to the dealership, they remarked that they had seen a few cars have this problem. They replaced something (can't remember what, since it seemed somewhat common, and was covered under warrantee) and sent us on our way. No problems since then. Possible not related to tune after all?
Junior Member
Joined: Jul 2017
Posts: 56
Likes: 5
C43
Update about the situation.
I had the limp mode CEL, and sent my car back to dealership. Dealer replaced the pressure sensor and stated its fine now.
However, today,the day after I got my car back from dealer, on my way to work the issue occured again on highway.Now, I am turning to my tuner now...
I had the limp mode CEL, and sent my car back to dealership. Dealer replaced the pressure sensor and stated its fine now.
However, today,the day after I got my car back from dealer, on my way to work the issue occured again on highway.Now, I am turning to my tuner now...
MBWorld Fanatic!
Joined: Nov 2015
Posts: 1,255
Likes: 154
From: Massachusetts USA
2017 C43 sedan
Update about the situation.
I had the limp mode CEL, and sent my car back to dealership. Dealer replaced the pressure sensor and stated its fine now.
However, today,the day after I got my car back from dealer, on my way to work the issue occured again on highway.Now, I am turning to my tuner now...
I had the limp mode CEL, and sent my car back to dealership. Dealer replaced the pressure sensor and stated its fine now.
However, today,the day after I got my car back from dealer, on my way to work the issue occured again on highway.Now, I am turning to my tuner now...
Member
Joined: Oct 2016
Posts: 178
Likes: 41
Mercedes Benz C43 AMG
Member
Joined: Dec 2015
Posts: 77
Likes: 8
Mercedes E63 AMG
Member
Joined: Mar 2011
Posts: 93
Likes: 12
From: So Cal
2018 M4 comp cabriolet, 2017 C43 Sedan, (wife)
The Active Brake Assist Malfunction light came on when she was on the way to work. Since she was really close to the dealership when it happened, I just told her to drive straight there and I would call the SA. So since I was not driving, and she only drove a very short while after the light came on, I'm afraid I can't offer much help. I only mentioned because OP had listed that as one of the indications, and I wanted to let him know that indication happened without tune as well. I does seem strange, however, that so many of us get that fault starting a few weeks ago. Really makes you wonder if they can indeed "talk" to our cars.
