I have a 2011 Audi a3 8p 2.0tdi, I put a new battery on Monday and it’s all been fine until today. 

went to go into the car today and no lights come on dash. Not even the display for mileage, engine turned over started for a second then cut out. 
 

Obd is letting me do a scan but when trying to get into immobiliser it won’t connect. 
 

These are the codes that I have got with a snapon Zeus — 

ECU (Engine Control Module)
P157000 - Engine Control Module (ECM) Locked
P0672 - Cylinder 2 Glow Plug Circuit

ABS / ESP Control Module
01317 - Control Module In Instrument Cluster (J285) No Communication

Power Steering Control Module
01309 - Power Steering Control Module: No Signal/Communication

CAN Gateway (19 - Gateway)
00381 - Databus Instrument Cluster: No Signal/Communication
00474 - Control Module For Immobilizer: No Signal/Communication
00473 - Combination Comfort Databus In Single Wire: Open Circuit

Central Electronics / Body Control Module
U015500 - Lost Communication With Instrument Panel Cluster (IPC)
00532 - Supply Voltage B+ Lower Limit Reached

The car had a full valet on Wednesday. Seats and carpet left soaking wet? 
Thursday had a new window mech as cable snapped on Thursday been sat for 2 days and now this? 
 

anyone had this before could help me out thanks 

Welcome Mark,

What led you to renewing the battery?

What brand did you buy?

Did you code the new battery to the car?

Did you check the alternator output? 
Have you checked for a parasitic drain on the battery? 
Regards,

Gareth. 

Car had been sat for ages and battery was goosed. Put it on a charge and voltage dropped straight away. Also tested it with snapon battery tester and said replace. I bought it from napa auto parts stop/start battery. 

alternator was pushing out 14.3/14.4 once tested with new battery. 

battery didn’t get coded to the car no. 

haven’t checked for a drain but lads at work was saying the hazzard were flashing but no noise from alarm? 

everything was good until it got a wetvac on seats and floors. Guy who done it left them soaking wet. 

 

Hello Mark,

Your additional detail now paints a different picture, and points to the need of explaining the full story from the outset. 
Comments:- I wouldn’t have bought a Napa battery for these battery-sensitive vehicles, but that’s a personal view, based on experience of simply buying best quality at most competitive price. 
Battery needs to be coded ASAP to minimise the risk of toasting it, if not already done so. 
Hazard lights flashing ( I guess when not switched on?) points to alarm issues. 
‘Wetvac’ on floors and seats and ‘…soaking wet’. The moulded carpet has a water resistant backing, so surface wetness should not have got through to any under-carpet electrics, but obviously we cannot quantify your ‘soaking wet’. It could well be a contributor to your issue, but it could be a coincidence. Lifting carpet ( after vacuuming as much moisture as possible) would be the only way to check. 
Engine starting and cutting out a few seconds later, points to immobiliser issues, but many of your codes can point to a below par battery. 
Recharging the battery maybe a no cost interesting trial. 
Please let us know how you get on. 

Thanks for reply magnet. 
I’ve used Napa battery’s for a while and never had an issue but it’s not to say I’ve got a dud battery. 
 

yeh hazard flash when it’s parked up and Locked up but no alarm sound. 
 

I’ve had a jump pack and still no joy 

and had a jump start from another vehicle with still no joy. 

Will put the battery one a full charge today and see what happens with that 

thanks again 

11 hours ago, Briggsyyy95 said:

everything was good until it got a wetvac on seats and floors. Guy who done it left them soaking wet. 

 

That's too much of a coincidence to dismiss. Some models, and I don't know if yours is one of them, have connections under the seats and/or carpets for such things as comfort control modules and airbags, so it would be worth looking there for moisture and corrosion of terminals.

I also echo Gareth's comments on battery coding. Without coding the new battery may be damaged.

Will put battery on a charge while lifting the carpet up the check. Cheers cliff 

Mark have you resolved the issue? Can you clarify if the instrument cluster is still not lighting up at all, if so then the cause of the failure to continue to run will be no comms with the cluster, which will cause the immobiliser to cut the engine. If this is the symptoms then just unplug the cluster overnight and then just plug back in and see if that then resets things.

Hi mate been too busy at work to have a look at it, gonna get a look at it on Monday hopefully can figure it out

Hi tugg, unplugged clocks for 24 hours and now back working? Thanks for your help mate! What would be the cause of this do you know?

3 hours ago, Briggsyyy95 said:

Hi tugg, unplugged clocks for 24 hours and now back working? Thanks for your help mate! What would be the cause of this do you know?

Have been trying to figure this out myself, and the only common point on each case seems to be battery been replaced or totally drained previously. Glad it worked out for you at Zero cost 😁