P0684 – Glow Plug Control Module to PCM Commmunication Circuit Range/Performance
SKODA SUPERB Estate (3V5)

I
reset the code but seeing as the ambient temperature is great today
I’m not really surprised the fault hasn’t returned. It’s got a
service due in a month and so I’d really like to sort this myself
before then. All
the glow plug resistances read 0.6homs or there abouts so I’m
guessing this is normal? If not where else could I look?

Thanks

Could
someone help with the locations of the GPCM, PCM and the
solenoid?

Thanks