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Post by syafiqfox on Apr 26, 2024 13:14:47 GMT
Hi, I keep getting this fault code, P30DE00 (Voltage Drop via Generator Line Too Large), as shown in the photo under Module Hex 19. It seems like the fault code appears right after I start the car. There are no other faults in the other modules, though.I'm not sure where to start troubleshooting. Could it be the alternator (replaced in early 2023)? Perhaps the retrofitted interior LED lights are draining the current?Initially, the fault code status shows as "static" and cannot be cleared. I have to wait a few minutes while the engine is running or take a short drive to change the fault status to "intermittent" and then clear it.This issue occurs almost every time I start the car. Has anyone else faced a similar issue and found a resolution? I appreciate any responses.  |
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Post by dv52 (Australia) on Apr 26, 2024 22:40:27 GMT
Interesting problem!!! Based solely on the information provided in your post - I'm not sure of the cause. However, this is the primary part of the power-supply rail for a Golf mk7: And this is how the +12V connections on Fuse holder A in my wiring diagram above translates to actual, physical terminations
So, the 4 x important terminations for this problem (I guess) are 508, SA2 and the Battery/Alternator earth connections. The obvious possible cause of the P30DE00 - Voltage Drop via Generator Line Too Large error is the integrity of the black wire in my diagram that transports the alternator charging voltage to SA2.
I very much doubt that the bolted connection for SA2 on the fuse holder is loose (because the bolt has a one-way-only nut) - but maybe check the connection on the alternator? Also check the Alternator earth connections (i.e. the bolts that hold the alternator body to the engine frame)
Don
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Post by syafiqfox on Apr 27, 2024 1:01:50 GMT
Hi Don, thanks for the response. I have replaced the black cable circles with blue ones. That's one thing I've already checked. Now, I need to inspect two more sections of the black wire: 1. from fuse holder A to the alternator, and 2. from the alternator to ground. I'll inspect them and report back if I find anything.  |
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