Could Low Battery Cause This Glow Plug Fault?

AndyCr15

AndyCr15

AndyCr15

Soldato
Joined
28 Apr 2011
Posts
15,146
Location
Barnet, London
My car is a Skoda Superb Mk3 1.6l Diesel.

On Saturday I left the interior light on.
I drove it Tuesday... didn't notice.
I next drove it Friday and noticed before starting. Turned it off. It turned over for longer than usual, but started. (Usually is pretty instant)

I'm not sure when I noticed, maybe driving home, but the check engine light was on.
I checked a couple of days later when I found my ODBII dongle and it told me -

P0684 [0x0684]
Glow plug control module to ECM/PCM communication error - range/performance problem

04976 [0x001370]
P068400: Glow Plug Control Module to PCM Comm.Circuit Range/Performance

I reset the warning but noticed initially it wouldn't start, turning over and over. I Turned off, turned on and then it started instantly but the check engine light was on again (If not instantly, shortly after or maybe the drive home) and the dash gave me a warning about battery being low. The drive home it started instantly.

This morning I put the battery on charge, then called a local garage and booked it in for Thursday.
I've just taken it off charge and reset the warning again. It has just started three times instantly with no warning light coming on.

Tomorrow I will use it for the gym as usual and Wednesday I will drive 1.5 hours to work and a similar length home.

I guess I will see how it is over the next two days, but I was curious... all that back story to then ask, could the error be related to a low battery? I'm hoping I can get away with not needing the garage, or is it best to let them have a look over it?

Thanks.
 
I think I replaced the battery in March 2023.

Having said that, I found an email from the service saying I needed one (at £270ish) and I thought I'd found one myself at closer to £90. I thought I'd ordered it and fit it myself, but I can't find a receipt email, so maybe I never got round to ordering it...
 
Wow, interesting. Did you get any errors due to this 'coding'? I guess not if you replaced official with official...

This morning's gym trip has shown the engine light come back on, so I'll leave my booking with the garage tomorrow. Maybe it's more than just the battery.
 
Diddums said:
If you can swap it over without coding, then you're wasting money on the garage.
Click to expand...
I guess my concern is, we don't know it's the battery 100%. I charged it for 8+ hours yesterday, plus nothing else has really indicated the battery has struggled other than one warning after I turned it over for about 10 seconds without it starting (even then, it turned over quickly the whole time). I released, tried again and it started instantly and I never saw the warning again. I think I'd be happier with them checking everything over. On a Skoda forum, someone had these errors and it was a little comms box in the engine.
 
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