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1
Golf mk6 / Re: Mk6 Electrical issues
« Last post by Snoopy on Today at 13:12 »
No communication or sporadic communication with engine ECU, and intermittent start issues is often the relay in the fuse box under the bonnet. I've had to replace a few over the years on people's VWs. It's a known issue.
The two relays under the bonnet are the same. One does power to engine ECU and the other does emission stuff. Try switching them over and see if this fixes the start issue. A new ones about £12 on ebay.
The relays have 100 wrote on the top and are part number 7M0  951 253 A

Edit: last one we bought were Bosch equivalents.
Bosch 0986332001 Relay
from a company called Parts In Motion from there own website as was cheaper than their ebay shop
£9.91 delivered.
2
Golf mk6 / Re: Mk6 Electrical issues
« Last post by JSYGTI on Today at 07:28 »
I certainly don’t know the answer, but have you had the battery tested?

A while ago, my GTI was having trouble starting occasionally, got the battery tested, and it was confirmed dead, just wasn’t holding charge.

That would be my starting point, but I’m sure much more knowledgeable people will chime in.

Good luck.
3
Golf mk6 / Re: Mk6 Electrical issues
« Last post by Nino on Today at 07:26 »
Honestly, that doesn't sound like anything that is consdered what would be a common fault lots of us have encountered.

It's hard to say over the internet but you clearly have a bad electrial issue.

if it was me, this is what I would check before calling out an auto elec. It could verywell be a failing battery or even just poor connections. This is the first thing to rule out, even if it seems obvious.

Weak battery can cause:
- ECU communication failures
- Immobiliser/key recognition issues
- Random “dead car” symptoms

Grab a voltage meter, Battery voltage (should be ~12.6V off, ~14+V running) check the terminal tightness, corrosion on terminals or ground points.

You could even have a bad/loose ground. Check Battery-to-chassis ground & Engine ground strap if you find any corrosion, rub it down.
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Golf mk6 / Re: New Head Unit
« Last post by Nino on Today at 07:15 »
Quote from: jdoubleu on 17 March 2026, 18:09
Quote from: Nino on 16 March 2026, 07:28
Quote from: jdoubleu on 15 March 2026, 10:46
I looked into this. My car also has Dynaudio and reverse camera. From what I could tell, the RCD330 should work fine with Dynaudio but it does not look like a straight swap for the reverse camera. I gave up on my research last time but might revisit in the future!

The Dynaudio shouldn't have any special loom for a head unit, all that is taken care of at the amp on under your boot floor with the sub.

With the reverse camera, the RCD330 should form memory have an input via RCA.

It does. But stock is RGB I think so not a direct swap. I might have been looking at the wrong advice but it looked quite a lot of work to get the RGB to RCA bits working.

Have a watch of this :)

https://youtu.be/7diy5jVYnB0
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Golf mk6 / Re: New Head Unit
« Last post by jdoubleu on 17 March 2026, 18:09 »
Quote from: Nino on 16 March 2026, 07:28
Quote from: jdoubleu on 15 March 2026, 10:46
I looked into this. My car also has Dynaudio and reverse camera. From what I could tell, the RCD330 should work fine with Dynaudio but it does not look like a straight swap for the reverse camera. I gave up on my research last time but might revisit in the future!

The Dynaudio shouldn't have any special loom for a head unit, all that is taken care of at the amp on under your boot floor with the sub.

With the reverse camera, the RCD330 should form memory have an input via RCA.

It does. But stock is RGB I think so not a direct swap. I might have been looking at the wrong advice but it looked quite a lot of work to get the RGB to RCA bits working.
6
Golf mk8 / Re: mk8.5 GTI road noise
« Last post by Caveblade on 17 March 2026, 17:24 »
I think the whole refinement thing is interesting with the 8.5.

I had a 7.5r and the quality and refinement were definitely superior. I had a MK8 GTI and hated it. It lasted 3 months and I swapped it for a BMW M340i.

I am 2 months into an 8.5 Clubsport and I find the whole refinement piece really interesting. I really like the car but hated the artificial noise. My local dealer told me it is not possible to turn this off. Luckily I found an independent garage who were quite happy to turn the Soundaktor off. This makes a massive difference, the car is quieter and far more refined. The engine sounds fine on its own, the fake noise sounds crap in my opinion.

I have DCC and am on Potenzas and I don't find them unduly noisy or harsh but will maybe try something different when they are ready to change. The car I test drove didn't have DCC and I would definitely recommend going for it.

Having had 7 Golfs, VW lost me with the MK8 but they have defintely got back on form with the 8.5. Its not a 7.5 though.
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Golf mk6 / Mk6 Electrical issues
« Last post by Baldyboy83 on 17 March 2026, 14:08 »
I have a 2010 MK6 GTI which is having some electrical issues it’s gone from flat battery to running to non starting and the ecu was unreadable by vw’s own diagnostic software however the next day it started and could be ready via Obd. Yesterday was driven for an hour and half on a longish drive & when I got home turned it off. But now the car won’t recognise the keys or even turn over. I was just wondering if anybody here had any advice as to what to look for before I spend ££££ on an auto electricia.
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Golf mk7 / Re: Mk7 was disappointing - should I buy a mk7.5 or even an 8?
« Last post by Nino on 17 March 2026, 11:27 »
Quote from: Hertsman on 17 March 2026, 09:45
You must have just been unlucky as my drives have been 2013 MK 7 GTD > 2016 MK 7 R 2019 > MK 7.5 GTI TCR and am running a 2019 MK 7.5 R now and none of those cars had any issues or additional work aside from regular servicing.

All these were DSG and I was originally very reluctant to move from Manual but within a week there was no going back, its amazing technology.

The MK 7.5 was the perfect evolution, a really balanced mix of buttons and new tech, with upgraded media system and driver display and something still prefer over the new models which are cabin bare and screen driven.

Yeah I think I probabily was.

I do like the Edition 40 but I think I will get a TCR when I can afford it.
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Golf mk7 / Re: Mk7 was disappointing - should I buy a mk7.5 or even an 8?
« Last post by Hertsman on 17 March 2026, 09:45 »
You must have just been unlucky as my drives have been 2013 MK 7 GTD > 2016 MK 7 R 2019 > MK 7.5 GTI TCR and am running a 2019 MK 7.5 R now and none of those cars had any issues or additional work aside from regular servicing.

All these were DSG and I was originally very reluctant to move from Manual but within a week there was no going back, its amazing technology.

The MK 7.5 was the perfect evolution, a really balanced mix of buttons and new tech, with upgraded media system and driver display and something still prefer over the new models which are cabin bare and screen driven.

10
Golf mk8 / Re: mk8.5 GTI road noise
« Last post by Hertsman on 17 March 2026, 08:49 »
Quote from: Tarmac_Terrorist on 16 March 2026, 22:47
Coming from my previous RSQ3 the GTI is quieter and the DCC makes for a much nicer ride too. I’ve been pleased with the Hankook tyres.

Driving a Cupra Terramar VZ1 272PS with the version 2 DCC at moment, which is basically a Q3 in disguise and its like driving around in my favourite chair in living room when all set to comfort, on the larger tyres and fantastic seats. Very impressive car the Terramar.

However feel out MK 7.5 R on Continentals with no DCC is pretty good on ride and road noise, so based on a few comments seen on the MK8 series on ride and road noise, will look to test drive to see for myself and look for DCC when in market for an upgrade.

It is all very subjective subject though.
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