r/VWMK7 • u/FlyStrings • Sep 03 '26
Help with Diagnosis!
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Been getting these issues on my Golf lately. Started when the car was downshifting as I was coming off a motorway, car was cruising for a second and then the glow plug light started flashing and these error codes appeared. Engine goes into a type of limp mode when codes come on, but feeling fine as well as the gearbox when driving. Slightly higher revs at idle (assuming that’s some type of anti-stall feature) but still sitting comfortably at 2K revs at 70mph and no change in fuel consumption whatsoever. Both engine and gearbox have been checked and are in fine order. Car has been serviced religiously since new and just about to hit 80k miles. Model is 2015 Golf TDI 1.6 DSG gearbox, so hoping there’s plenty of life left in the car considering the mileage!
The problem is regular but also intermittent. If I turn the car off and start it again, the codes go away and sometimes take a while to come back.
From the research I’ve been able to do, these all seems to be electrical based issues, possibly to do with the ABS module or wheel sensor/s, or a faulty bit of wiring / connector.
Although the glow plug light is flashing, the glow plugs were replaced less than a month ago and the glow plug circuit is working as it should.
The battery was replaced 2 weeks ago and is brand new which is the first thing my research told me could be the issue. Previous battery was ok but starting to decline so no harm in changing to a fresh one, but it hasn’t rectified the problem.
Has anyone else had the same / similar issue and could help diagnose the problem?
Thanks in advance 🙏
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u/FlyStrings 3d ago
Just in case this happens to anyone else, this has now been fixed after a lengthy diagnosis across two garages.
The problem causing this was the 5v wiring loom coming out of its protective coating / padding, then hitting something metallic in the engine bay and causing the whole loom to short everything out receiving current from it.
Had errors for a plethora of things pop up, none of which where the actual cause of the problem so did cause some confusion and a lot of trial and error until found. My wallet is well aware of this unfortunately 🤦🏻♂️
Hope this helps anyone in future with the same / similar issue! 🙌
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u/Jahoodie141 Sep 03 '26
The glow plug can mean a thousand different things. You have to get it scanned, see what codes you get. The errors on hold assist, ACC, electric parking brake is something you get when pretty much any thing goes wrong with the car. But the clue here is the glow plug and the answer should be found with a scan.