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Anybody seen this code "321C" ?
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10-01-2018, 01:45 AM | #1 |
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Anybody seen this code "321C" ?
Hello fellow Bimmer lovers,
I've recently replaced HPFP for my 2011 e92 335i xDrive. Good thing I've got it under the powertrain warranty as I got it used from a dealer. Anyways, since the replacement, I am keep getting an alarm everytime I start up the car. With a warning, it says "Close gas cap" on my dash and the CIC shows "Please tighten the gas cap". With the alarm, I get the CEL as well. I've hooked up MHD to read the code, and it says: 321C: Fuel tank ventilation system and purge air system, minor leak: Leakage greater than 1.0 mm. I could not find ANY INFO at all about the code 321C. Here are two of my guesses: 1. When the dealer was replacing the HPFP, they messed up somewhere and there is a fuel leakage.(Possibly the fuel line or the HPFP itself) 2. Simple gas cap rubber gasket issue. I wish the second case would be it, as replacing the gas cap would solve the problem.... But before I try anything, I'd like to get everyone's opinion!! p.s. I've seen cases that it might be DMTL pump, but I doubt it as it would throw out a different code. |
10-01-2018, 03:26 AM | #2 | |
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10-01-2018, 12:32 PM | #3 | |
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Your statement makes total sense and I think I could leave HPFP alone. The dealer is located like 1.5hr drive away and I cannot reach them during weekdays due to works. Hopefully, I'd find the cause very soon! |
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10-01-2018, 03:11 PM | #4 | ||
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03-31-2020, 05:13 PM | #6 |
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I have got a 321C code as well... what is it? how did you get it resolved?
thanks
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03-31-2020, 06:08 PM | #7 |
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Hey folks,
Sorry that I totally forgot about this post. Code 321C means that literally there's a leak of the fuel fumes somewhere in the EVAP system. You have to check the lines all the way from the Gas tank -> Charcoal Canister -> Fuel Tank Purge Valve -> Throttle body or Gas tank -> Charcoal Canister ->DMTL pump In my case, the Fuel Tank Purge Valve had the pipe disconnected from the Charcoal Canister, which made a major leak in the fuel fumes all the way from the gas tank into the engine bay.
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2011 E92 335i xDrive / ARM Charge Pipe / G-Plus FMIC / Unknown DP / MHD Stage 2+ 91 Octane SOLD |
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04-08-2020, 04:49 PM | #8 | |
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hey, looks like you live in Vancouver BC as well. Which shop did you go to to get your problem fixed? thanks,
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04-10-2020, 02:21 PM | #9 |
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DIY all the way!
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05-14-2020, 05:30 PM | #10 |
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thanks. I live in a tiny condo with a tiny parking space. I just don't have the space to do any work on my car.
I took my car to CG motorsport and they replaced the gas cap. The code came back a couple of days later. I was told to bring my car in for some more diagnostics. I will ask them to look at all of these: Gas tank -> Charcoal Canister -> Fuel Tank Purge Valve -> Throttle body or Gas tank -> Charcoal Canister ->DMTL pump thank you so much!
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Mod List: Twisted Tuning MHD tune, XHP3, ER Charge Pipe, catless DP, ER Competition FMIC, Pure Stage 2 Turbo, PURE High Flow Inlet Pipe, ER Outlet Pipe, GFB DV (Plus), Gruppe M intake, Supersprint full exhaust
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05-25-2020, 02:16 PM | #11 | |
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Simple hose disconnection underneath the engine and I was rated a full hour service for this. Later, I found that my case was < 5 min issue... They are great mechanics though!
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