VW Beetle Forum banner

VCDS 17925 P1517 fault code ECU Relay J271 - 1.8T Cranks, BUT no start

94K views 24 replies 6 participants last post by  gpete8  
chassis ground

Brand new ECU from VW would have cost $$$$, and wouldn't have been economically viable since the vehicle is ~15years old etc etc

So, I set to trawling the web for a used one, knowing that I would have to find the EXACT same ECU with the EXACT same part number. Not easy.

Eventually found one on eBay.. thought that was hard enough.

But, that was relatively easy when compared with the next stage.

I wont bore you all with the intricate details, but suffice to say had to use an EEPROM programmer in conjunction with VCDS to exact and dump the SKU codes from both ECU's in order to programme across the immobiliser / ecu info... quite tricky

End result. The bug is working again :cool:

Cause of the issue?

IMHO, Electrical shorts cause by bad Earth points. Story with most VW's of that gen..

The main earth from battery to chassis was corroded pretty bad along with at the block too.

Done the "Big 3 Upgrade" so hopefully won't have any similar issue coming up again........

Now onto another issue. Will it or rather - does it ever end.. :confused::mad:
yea common issue is the battery chassis ground corroding . Glad you found the problem man.... good job.:D
thanks for posting pictures I had never seen the inside of the ECU in these cars,