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Author Topic: Rs6 C5 2002 error code 16985 checksum error random when the engine starts  (Read 5870 times)
djbilbao
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hello to all I have a recurring problem for some time, I have a fault 16985 internal error checksum memory, I specify I am in stage 1 e85, I have tried several manipulations other ecu same, other flash cord Same mpps, kess, in the rosstech list it mentions low voltage, I have a new alternator but my battery which is 2 years old at most gives strange signs of voltage drop at start-up 8V and this is often where the fault appears, forcing it to be reflashed 'ecu I don't know where to look anymore I have 12.5V when stationary and 14V with the engine running, small indications the engine in some cases has trouble launching it

attached is the link of the video where we see the instrument weaken at stort hottom: 100ah or 900a of memory 公 | 2/2 | V

https://youtube.com/shorts/axFWXU.1012F
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djbilbao
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I also states that there have been several attempts OBD writing, bootmode, checksum also tunerpro other soft WinOLS ditto 0 error
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aef
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some custom code for launch control involved?
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djbilbao
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what is curious is that I can ride smoothly 150 / 200km is variable, and a start degraded mode and error 16985
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djbilbao
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some custom code for launch control involved?
what do you mean by custom code ? cordially
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IamwhoIam
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some custom code for launch control involved?

On a tiptronic C5 RS6? LOL
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I have no logs because I have a boost gauge (makes things easier)
nyet
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good thing you posted the output of me7sum
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ME7.1 tuning guide (READ FIRST)
ECUx Plot
ME7Sum checksum checker/corrrector for ME7.x

Please do not ask me for tunes. I'm here to help people make their own.

Do not PM me technical questions! Please, ask all questions on the forums! Doing so will ensure the next person with the same issue gets the opportunity to learn from your experience.
prj
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Flash car with stock file, most likely your problem will disappear.
And then find someone who actually knows something about these Smiley
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Log your car properly.
nyet
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what do you mean by custom code ? cordially

Return to stock, or find a competent tuner.
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ME7.1 tuning guide (READ FIRST)
ECUx Plot
ME7Sum checksum checker/corrrector for ME7.x

Please do not ask me for tunes. I'm here to help people make their own.

Do not PM me technical questions! Please, ask all questions on the forums! Doing so will ensure the next person with the same issue gets the opportunity to learn from your experience.
djbilbao
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what do you mean by custom code ? cordially

no launch control thx
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djbilbao
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On a tiptronic C5 RS6? LOL
hello it's possible not as efficient as the new automatic gearboxes and not great for that mechanical nevertheless doable
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djbilbao
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good thing you posted the output of me7sum
hello, sorry for the delay of the me7check report I was struggling with my CMD command here is the return Lips sealed


html image online
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djbilbao
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Flash car with stock file, most likely your problem will disappear.
And then find someone who actually knows something about these Smiley
I will also try but the concern is to determine if it is indeed a software problem so map or checksum or electric battery, ground ect hence my question cordially Wink
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prj
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Flash to stock, 99% sure there will be no more errors.
Stop wasting time.
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PM's will not be answered, so don't even try.
Log your car properly.
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