2019 C43 power loss after a few pulls. Need advice!
Thread Starter
Junior Member
Joined: Apr 2019
Posts: 66
Likes: 7
From: Canada
2019 C43
2019 C43 power loss after a few pulls. Need advice!
Hi guys, hope y’all are doing well. Recently I have experienced several power loss issues. And all of them happened after a few minutes of hard core driving. I noticed that there was no boost pressure when the issue came out. At first I thought it was some boost leak and after I took the car to the dealership for an inspection, they found out my boost pressure transducer was not working properly. The technician told me a code for “boost pressure too low” was found when they were test driving the vehicle. So they had a new boost pressure transducer on order for me under warranty. I’m still waiting for the part to get here.
As my car is equipped with Racechip piggyback unit, I’m not sure if it’s the Racechip that causes the problem. Recently, within a month, I’ve experienced 3 instant power losses. One with engine light on, and the car went into limp mode with crazy jerky idle. I took it to the dealership and they update the ECU, and switch the position of a few spark plugs. Then the problem was gone. And only after 2 weeks, again it’s still after a few hard pulls, the car lost the power. However, no check engine light came on. The acceleration was really slow. The car was back to normal after I restart the engine. Today, this issue happened to me again. No engine light. No rough idling. Just slow acceleration. And no boost reading on the screen. I highly doubt it’s the Racechip that causes the problem, because when normally driving the car without the Racechip, of course there are lots of hard pulls, the boost pressure is correct, no power loss whatsoever. As I have to wait my part for about 3 weeks, I reinstalled the Racechip earlier this week. Then the problem popped up again earlier today.
As my car is equipped with Racechip piggyback unit, I’m not sure if it’s the Racechip that causes the problem. Recently, within a month, I’ve experienced 3 instant power losses. One with engine light on, and the car went into limp mode with crazy jerky idle. I took it to the dealership and they update the ECU, and switch the position of a few spark plugs. Then the problem was gone. And only after 2 weeks, again it’s still after a few hard pulls, the car lost the power. However, no check engine light came on. The acceleration was really slow. The car was back to normal after I restart the engine. Today, this issue happened to me again. No engine light. No rough idling. Just slow acceleration. And no boost reading on the screen. I highly doubt it’s the Racechip that causes the problem, because when normally driving the car without the Racechip, of course there are lots of hard pulls, the boost pressure is correct, no power loss whatsoever. As I have to wait my part for about 3 weeks, I reinstalled the Racechip earlier this week. Then the problem popped up again earlier today.
Last edited by BillyTheDude; Oct 7, 2020 at 02:33 AM.
Member
Joined: Jul 2020
Posts: 167
Likes: 38
Mercedes-AMG C43 2019
Duh, then don’t use race chip do yourself and your 50-60k car a favour and use jb4, I had one once never had any bs issues like that don’t cheap out when it comes to Benz cause it’s a car full of technologies the race chip could be triggering something (coming from a guy w a 2019 like you) if you don’t want a tune, get a jb4 w a bcm and maybe if you want get air intakes and you’ll be doing 11.8 quarter mile certified @BMS @Payam@BMS
I have used jb4 on both 2018 and 2019 w no problems the jb4 has various safety measures that prevent cel and engine lights as you can reset them w it
I have used jb4 on both 2018 and 2019 w no problems the jb4 has various safety measures that prevent cel and engine lights as you can reset them w it
Last edited by 19’43s; Oct 7, 2020 at 04:36 AM.
Thread Starter
Junior Member
Joined: Apr 2019
Posts: 66
Likes: 7
From: Canada
2019 C43
Duh, then don’t use race chip do yourself and your 50-60k car a favour and use jb4, I had one once never had any bs issues like that don’t cheap out when it comes to Benz cause it’s a car full of technologies the race chip could be triggering something (coming from a guy w a 2019 like you) if you don’t want a tune, get a jb4 w a bcm and maybe if you want get air intakes and you’ll be doing 11.8 quarter mile certified @BMS @Payam@BMS
I have used jb4 on both 2018 and 2019 w no problems the jb4 has various safety measures that prevent cel and engine lights as you can reset them w it
I have used jb4 on both 2018 and 2019 w no problems the jb4 has various safety measures that prevent cel and engine lights as you can reset them w it
Member
Joined: Dec 2019
Posts: 111
Likes: 32
From: West
C43
your other incidents... I mean it sounds like they found the problem?? The boost transducer? Wait for that to get fixed first. No point in finding addition “problems” when there might not be any (having said that, I’m big fan of the JB4 so if you want to grab one, grab one)
edit: reread your post and I see it doesn’t happen without racechip active. A huge huge huge benefit of JB4 (the reason I still have mine despite using a dif tune) is it logging ability. Also, racechip or not you don’t really want to change too much at once when trying to figure out what’s going on
Last edited by Trekt43; Oct 8, 2020 at 02:05 AM. Reason: Adding
Thread Starter
Junior Member
Joined: Apr 2019
Posts: 66
Likes: 7
From: Canada
2019 C43
My guess is the first the first incident was actually a misfire. When a misfire is detected the engine will shut off fuel to the effected cylinder (and possibly the whole bank). This causes reduced power and the whole car to shake/rock. It’s interesting MB didn’t catch a code for that tho (although the fact they moved a few spark plugs around is... weird). Problem could be lower octane on the higher boost from race chip. I had several misfires early on using the JB4 if I changed map and didn’t let the car adjust for long enough.
your other incidents... I mean it sounds like they found the problem?? The boost transducer? Wait for that to get fixed first. No point in finding addition “problems” when there might not be any (having said that, I’m big fan of the JB4 so if you want to grab one, grab one)
your other incidents... I mean it sounds like they found the problem?? The boost transducer? Wait for that to get fixed first. No point in finding addition “problems” when there might not be any (having said that, I’m big fan of the JB4 so if you want to grab one, grab one)
For the recent two incidents of intermittent power losses without any CEL on, the dealership’s service guy said the problem is from turbocharger actuator, which according to him, the technical term is “boost pressure transducer”.
Also, here is the report for my second visit from the service guy.
Yesterday, the same issue happened again. And I talked to a technician outside the country, he said because the problem was popped up after hard core driving and was gone after restart the engine, this might have something to do with the turbo cooling system. He highly doubted the issue was from what the dealership had told me, which was sensor/transducer not within spect. He thought the problem wouldn’t be intermittent if the sensor/transducer was already bad. He instead suggested me to check the cooling pipe line.
I’m so confused.
Last edited by BillyTheDude; Oct 8, 2020 at 02:24 AM.
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Thread Starter
Junior Member
Joined: Apr 2019
Posts: 66
Likes: 7
From: Canada
2019 C43
Two quick UPDATES:
1. It turned out the issue was caused by boost pressure control pressure transducer (module that controls the wastegate) malfunction. This is not the boost pressure sensor connected to the piggyback. The part number is 0101531328, which is located slightly under the left intake. I have talked to a few 2019 C43 owners and a few GLC 43 owners as well, and some of them had experienced the same issue I just had, which was the loss of power or no boost pressure during acceleration. All of their cars are in stock condition. No ECU flash, no piggyback whatsoever. After comparing their reports from dealerships, I noticed the problem descriptions and malfunction part numbers are all the same as mine. So, I would say the issue would most likely be a manufacturing defect of the part itself.
2. New part had already been installed. The issue was completely gone even after hard pull.
1. It turned out the issue was caused by boost pressure control pressure transducer (module that controls the wastegate) malfunction. This is not the boost pressure sensor connected to the piggyback. The part number is 0101531328, which is located slightly under the left intake. I have talked to a few 2019 C43 owners and a few GLC 43 owners as well, and some of them had experienced the same issue I just had, which was the loss of power or no boost pressure during acceleration. All of their cars are in stock condition. No ECU flash, no piggyback whatsoever. After comparing their reports from dealerships, I noticed the problem descriptions and malfunction part numbers are all the same as mine. So, I would say the issue would most likely be a manufacturing defect of the part itself.
2. New part had already been installed. The issue was completely gone even after hard pull.
Last edited by BillyTheDude; Oct 28, 2020 at 04:28 AM. Reason: need to include more information
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c43
I know this is a super old thread but I use the jb4 and I’m experiencing the same issues loss of power at Radom times and i would have to shut off the car and restart it …. I had the jb4 for months and this started randomly. The car has been to the dealer 3 times and they can’t solve the issue . First it was the transducer then they changed the turbo and now they say there was a loose hose but it still does the same thing ..so I contacted Mercedes corporate for a buy back cause this car is definitely a lemon
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Member
Joined: Nov 2021
Posts: 244
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From: New England Area
2015 ML63
This is interesting... i had a 2017 C43 with a jb4 tune and i started to experience this " No Boost after a launch"
Ended up selling the car and giving the tune to my coworker for his E43.. He came in the other morning after having it for about 2 weeks and said he is car has been cutting boost. Also created a fuel smell which we found was a leaking injector.. unsure if they were related at all but this is interesting...
Ended up selling the car and giving the tune to my coworker for his E43.. He came in the other morning after having it for about 2 weeks and said he is car has been cutting boost. Also created a fuel smell which we found was a leaking injector.. unsure if they were related at all but this is interesting...
MBWorld Fanatic!
Joined: May 2021
Posts: 1,317
Likes: 200
From: Plainfield IL
Amg C43
I know this is a super old thread but I use the jb4 and I’m experiencing the same issues loss of power at Radom times and i would have to shut off the car and restart it …. I had the jb4 for months and this started randomly. The car has been to the dealer 3 times and they can’t solve the issue . First it was the transducer then they changed the turbo and now they say there was a loose hose but it still does the same thing ..so I contacted Mercedes corporate for a buy back cause this car is definitely a lemon
I know in Illinois lemon laws only apply to the first 12 months.
I bought a cpo lemon and finally got a trade credit from Benz.
what codes was the car throwing ?
hope u didn’t buy my old car
Junior Member
Joined: Feb 2023
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c43
this was my 5th visit that they changed stuff so called corporate for a buy back waiting on a response but after every repair it ran fine but every time I would add the jb4 and do 2 or 3 pulls no power (boost) but once I restarted the car it was fine for alittle and went back to no power …. They changed so many things but nothing worked so I contacted burger motor sports
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Joined: Feb 2023
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c43
very tru … but what is interesting is the tech put a white strip like white-out paste along the 2 connection points for the jb4 not sure what it means but weird
