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  1. #1
    Active Member One Ring
    Join Date
    Jan 22 2025
    AZ Member #
    1000899
    Location
    Christchurch Canterbury New Zealand

    Help with electrical Gremlin P305300 C7 2014 RS7

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    Hi there,

    I've had an issue for a couple years now that I've searched a lot but not found the issue.
    My car went for an oil change, and mistakenly wasn't drained, then overfilled the oil which led to attempting a hydrolocked engine which absolutely fried my starter motor. The issue was supposedly fixed however since being 'fixed' my automatic start stop hasn't worked. The mechanics replaced the starter, but the car kept throwing the code. They supposedly checked the relays which were all in working order.

    The only issue is that it gives that code, starter activation, return message terminal 50 short to ground./open circuit.
    The symptoms are - start stop doesn't work, and I need to hold my finger on the ignition for the car to start and oddly start stop works just fine if I clear the code after starting the vehicle and everything works as it should. However I'm coming up to selling my car to move overseas and it gives and EPC light, and is just a bit unsightly, especially when asking for 40K+ for a vehicle.

    It's my first time posting on a forum, so if I've left out any information just ask, and I'd thoroughly appreciate any help or ideas that anyone has cheers.

  2. #2
    Veteran Member Four Rings Audibellybutton's Avatar
    Join Date
    Jun 28 2019
    AZ Member #
    496646
    Location
    California

    Get a ross-tech VCDS scan, you will have a much better chance of getting help on the internet trust me

    https://www.ross-tech.com/vag-com/VCDS.php
    C7 Audi A7 Prestige 3.0t (RIP) - Dual Pulley E40 , Turtle TCU , Ported Blower, Meth, Porsche 997 TB, Merc Racing Heat Exchanger, CWA-100, RKX Silicone Intake hose, RS7 Airbox, RS7 LPFP, JHM 207 pulley,SRM Driveshaft Upgrade, H&R Springs, 034 Drivetrain inserts, Vossen VFS2, RS7 Steering Wheel, Autotech HPFP

    C7 Audi S6 Prestige 4.0t (Current) - ZF8 Swap, E85 tune W/ FE STG2 Turbos, WMI, Merc Racing HX, EMP Coolant Pump,GFB DV+,LPFP upgrade, ECS Inlets, TS Gates, Exhaust
    IG:@stolens6

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