Verified VCDS User
- Sep 16, 2014
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Another way to find out is to unplug and see if you get a DTC for short to open.
Thanks, I did check for DTCs with the motor unplugged, no DTCs showed. So I agree the transfer pump is likely not monitored.
You may in fact be experiencing the tanks completing a gravity feed only to the one tank and is why you get the warning.
I agree I am experiencing the gravity feed to the Aux/Reserve tank, (hence it being full). Also, when I get the warning I can only add about 1 gal of AdBlue to the main tank. Which would also seem to confirm only the main tank fluid is ever available (the 3000mi between warnings).
Digging into the measuring blocks the Channel 105 shows " 0 (no units) 3 (no units) 17 (no units) 88.0 l Tank Cont" which seems to be an implausible reading for the main fluid level (88.0 l Tank Cont), which has me concerned the level sensor in the main tank may also be a problem.
Trying to figure out if the transfer pump is triggered by Main Tank level or some other event (every time the vehicle is started etc). If it is triggered off of the tank level this may also be the problem.
Any help is appreciated.