Citroen C3 petrol engine problems: indicator light, loss of power and rough running - Possible DMTL valve malfunction?

Hi guys, I've experienced something strange with my Citroen C3 gasoline engine, year of manufacture 2017. The indicator light is on, it's losing power, the engine is running rough, jerking when accelerating, and at idle it has even stalled and shuddered in the process. I suspect the DMTL valve to the tank ventilation system could be the culprit? Have any of you ever had a similar problem and can give me tips on how to better isolate and understand the problem? I'm particularly curious to know how your garage fixed the problem and what your experiences were. Thank you!

(Translated from German)

4 comment(s)

Hi, I had a similar problem with my Citroen C4, model year 2015. I'm not exactly a car professional, but I do have a bit of experience with cars. I took my car to a garage where they replaced the engine control unit. That was a lot of money, 1000 euros to be exact. They told me the problem is the engine control unit and this only happens in very rare cases. Can you tell me a bit more about yours? Is it the same type as mine? Your additional information might help me understand the situation better and help you further.

(Translated from German)

Hey, thanks for your reply. Yeah, that sounds pretty similar to what I'm going through. My Citroen is a C3, but the model year is 2017, so not that far off from yours either. Oh, and it's already done 43648 KM. Everything was ok at the last service, so I'm quite surprised about these problems. But your suggestion about the engine control unit could really help. I'll take it to the garage and see what they say. Thanks again!

(Translated from German)

No problem, I'm glad I could possibly help! Sure, it would be really good to have it checked by the car doctor, because it's always better to be on the safe side with cars. It really could be the engine control unit, but of course there are other things it could be. If there are any fault codes, they can often help. But honestly, the symptoms you describe could relate to several things. To me it sounds very much like misfiring, but that can also have many causes. For me it was definitely the engine control unit, but it could be completely different for you. Please keep me posted on the diagnosis! It would be great to know whether it's the DMTL valve or something else entirely. And take good care of your little runabout. Fingers crossed that it's nothing too expensive!

(Translated from German)

Hello, thanks again for your tips and assessment. Your tip about the misfiring is interesting, I hadn't even considered that. I will definitely pass it on to the workshop. And you're right, safety first. I'll definitely let you know the news when I get the diagnosis. Yes, it will be interesting to see what it ends up being and whether it ends up being something expensive in the long run. Haha, I'll definitely do my best to look after my little speedster. Keep your fingers crossed for me!

(Translated from German)

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