nsmiller
Member
Hi all,
My 2009 TDI has a parasitic drain coming from somewhere. I have read the VW tech bulletin about how to test for parasitic drains. I'm a MS student so my time to perform such a test while waiting 2-3 hours is limited.
Here's what I've done so far:
1. Experienced first dead battery condition.
2. Took 1 year old battery back to Advanced Auto, they charged and it tested good. They then performed a parasitic drain test on my TDI (not per the bulletin). We just closed all doors and latches while hooked up to their machine and waited for the display to go out (30 seconds) and it was pulling about 0.5 Amps.
3. The next time I started my TDI was 1 week later (I ride my motorcycle most days), and it started without any problem. I drove it about 20 miles and shut it off. I came back out to my TDI about 2 hours later and it would barely crank, not enough to start.
I suspect I have some component not going to sleep mode intermittently which is why my battery was able to last 1 week no problem but then could not last 2 hours.
I have scanned my computer with VCDS and cleared all fault codes. The only fault code that immediately returns is related to the fact that Satellite radio does not have a current subscription so it can't communicate with the tuner. My suspicion based on reading other threads is the problem may be radio related, but I don't think the satellite subscription issue should be causing this (Can anyone confirm?). Can anyone point me to some most likely culprits to help save me some time? If the radio is the culprit, what is the solution? New radio?
Thanks in advance for your help.
My 2009 TDI has a parasitic drain coming from somewhere. I have read the VW tech bulletin about how to test for parasitic drains. I'm a MS student so my time to perform such a test while waiting 2-3 hours is limited.
Here's what I've done so far:
1. Experienced first dead battery condition.
2. Took 1 year old battery back to Advanced Auto, they charged and it tested good. They then performed a parasitic drain test on my TDI (not per the bulletin). We just closed all doors and latches while hooked up to their machine and waited for the display to go out (30 seconds) and it was pulling about 0.5 Amps.
3. The next time I started my TDI was 1 week later (I ride my motorcycle most days), and it started without any problem. I drove it about 20 miles and shut it off. I came back out to my TDI about 2 hours later and it would barely crank, not enough to start.
I suspect I have some component not going to sleep mode intermittently which is why my battery was able to last 1 week no problem but then could not last 2 hours.
I have scanned my computer with VCDS and cleared all fault codes. The only fault code that immediately returns is related to the fact that Satellite radio does not have a current subscription so it can't communicate with the tuner. My suspicion based on reading other threads is the problem may be radio related, but I don't think the satellite subscription issue should be causing this (Can anyone confirm?). Can anyone point me to some most likely culprits to help save me some time? If the radio is the culprit, what is the solution? New radio?
Thanks in advance for your help.