009220 - EVAP Leak Detection Pump Sense Circuit: Implausible Signal
#71
F***! Just when I thought I would be able to enjoy my beautiful car in perfect condition - check engine light P2404 is back on. Back to Audi for more diagnosis.
Last edited by carlzimmerman; 08-24-2016 at 09:59 AM.
#73
The good news: I was able to get the car inspected after driving it straight to the inspection station so I am good for another year. Also, the Audi of Charlotte has one of the top audi mechanic instructors, so I am going to request he take a look at it because two other audi dealerships and three independent shops cant seem to figure it out.
#74
Has anyone tried updating their ECM firmware to the latest? I believe its 0050. I may as well be the guinea pig here and bite the bullet. milan_o did the ECM replacement and the code eventually came back. This is so frustrating!
#75
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Join Date: Apr 2009
Location: Louisville, KY
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I asked my service writer about this firmware update yesterday. I had already paid 1.5 hrs to diagnose, only to be told it would take more time. So that money is flushed, and the light came back on this morning (as they said it probably would). My paperwork says "likely ECU or LD pump, more diagnostics required". So, has anyone had better luck at the dealer?
So far, gas cap and purge valve replaced. Checking the vacuum line by dipstick this evening as well.
So far, gas cap and purge valve replaced. Checking the vacuum line by dipstick this evening as well.
#76
I asked my service writer about this firmware update yesterday. I had already paid 1.5 hrs to diagnose, only to be told it would take more time. So that money is flushed, and the light came back on this morning (as they said it probably would). My paperwork says "likely ECU or LD pump, more diagnostics required". So, has anyone had better luck at the dealer?
So far, gas cap and purge valve replaced. Checking the vacuum line by dipstick this evening as well.
So far, gas cap and purge valve replaced. Checking the vacuum line by dipstick this evening as well.
#77
AudiWorld Super User
Since your Audi dealer has determined that the ECU is OK, and the wiring, LDP, N80 valve, vacuum lines, gas cap, etc., etc. are OK also, then it would appear that the ECU software is the problem. Based on your experience and others, there isn't other hardware/component to check, so it has to be a software issue.
#78
Since your Audi dealer has determined that the ECU is OK, and the wiring, LDP, N80 valve, vacuum lines, gas cap, etc., etc. are OK also, then it would appear that the ECU software is the problem. Based on your experience and others, there isn't other hardware/component to check, so it has to be a software issue.
#79
Just for clarification, I replaced the ECU with a used one and the code came back. I did recently speak with the person that runs the shop at the local Audi dealership. He said he was familiar with the issue and I would need to replace the ECU to fix it.
I have not decided yet to buy a new ECU or just keep it as is.
I have not decided yet to buy a new ECU or just keep it as is.
#80
Just for clarification, I replaced the ECU with a used one and the code came back. I did recently speak with the person that runs the shop at the local Audi dealership. He said he was familiar with the issue and I would need to replace the ECU to fix it.
I have not decided yet to buy a new ECU or just keep it as is.
I have not decided yet to buy a new ECU or just keep it as is.