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  1. #1
    Established Member Two Rings JohnnyTooBad's Avatar
    Join Date
    Aug 14 2009
    AZ Member #
    46412
    Location
    NoVA

    EPC & TPMS Malfuntion lights

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    I started my car this morning, and it ran rough for a couple of seconds and the EPC light and a TPMS Malfunction warning came on. I shut the car off and started it again after a few seconds, and it ran just fine and the EPC light was gone, but the TPMS Malfuntion remains. I drove it around, and made a few stops at some stores, and it's still on. I didn't do anything to the tires, which have about 500 miles on them. I just bought the car in October, and the dealer put new tires, brakes, rotors and front calipers on it before they put it up for sale. I checked the pressures and all 4 are at 38, and I reset the TPMS on the MMI.

    Any idea what might be going on here? I'm wondering if something hiccuped in the electronics and maybe killed the TPMS sensor?

    It's a 2011 C6 A6 Avant with 89k on it.
    (DEAD) 2006 B7 A4 Avant 2.0T. Blue/Tan, Auto. 100% Stock, except for some window tint
    Replaced with a unicorn.... 2011 A6 Avant 3.0T, also Blue/Tan. Premium Plus, S-Line, Cold Weather Package.

  2. #2
    Veteran Member Four Rings SinCityA6's Avatar
    Join Date
    Jul 17 2011
    AZ Member #
    78357
    My Garage
    '07 Mustang GT Tungsten Grey/Black
    Location
    Sin City, USA

    Starting in 09, there are no true TPMS sensors. The computer calculates it off the ABS wheel speed sensor. The premise is that an under inflated tire will rotate at a different rate then a properly inflated tire. A 10% variance triggers the TPMS light.
    Now to your issue.... EPC is Electronic Power Control. This indicates a power variance that sends the car into a limp mode (running rough) by shutting down coil packs. This will generally throw the TPMS lights as well because the aforementioned setup.
    It should have cleared itself when the EPC light went off.
    You need VAGCOM to go into the modules and clear the fault codes manually.
    Question for you....do you know how old the battery is?


    Sent from my iPhone using Audizine
    '09 C6.5 A6
    M: 3.0t, GIAC/AWE Stg II+, Roc*Euro Intake
    I: Soul Black, CF Trim, LEDs, Paddles, C7 Shifter, Escort 9500i, Blackvue Dashcam
    E: Ibis White, 15% Tint, Smoked Corners, Tinted Tails, S4 Rockers, S6 Blades, RS6 Grill, OEM Splitters (F/R)
    S: H&R Springs/Sways, Koni FSDs, Adams Rotors, Akebono Pads, SS Brake Lines, Paint Matched Calipers, Niche Misano M116 Wheels

  3. #3
    Established Member Two Rings JohnnyTooBad's Avatar
    Join Date
    Aug 14 2009
    AZ Member #
    46412
    Location
    NoVA

    Thanks. I don't have a VAGCOM. Just a regular code reader. Maybe I should invest in a VAGCOM.

    Interesting thought about the battery. I just checked it for the first time, and get this.... It's the original battery. Built in July 2011. Still seems to have plenty of kick to it, but it does worry me that it's 7 1/2 years old. Especially since I'm about to go on a 1000 mile road trip to northern Vermont
    (DEAD) 2006 B7 A4 Avant 2.0T. Blue/Tan, Auto. 100% Stock, except for some window tint
    Replaced with a unicorn.... 2011 A6 Avant 3.0T, also Blue/Tan. Premium Plus, S-Line, Cold Weather Package.

  4. #4
    Veteran Member Four Rings SinCityA6's Avatar
    Join Date
    Jul 17 2011
    AZ Member #
    78357
    My Garage
    '07 Mustang GT Tungsten Grey/Black
    Location
    Sin City, USA

    EPC & TPMS Malfuntion lights

    Quote Originally Posted by JohnnyTooBad View Post
    Thanks. I don't have a VAGCOM. Just a regular code reader. Maybe I should invest in a VAGCOM.

    Interesting thought about the battery. I just checked it for the first time, and get this.... It's the original battery. Built in July 2011. Still seems to have plenty of kick to it, but it does worry me that it's 7 1/2 years old. Especially since I'm about to go on a 1000 mile road trip to northern Vermont
    I would replace if I were you. The car has a power monitoring system (black module on the positive cable at the battery) that controls the power going into and out of the battery. If it is sensing that the battery is getting low, it starts shutting down systems to conserve power. Not say this is your issue, but an EPC light just doesn’t come on for no reason.

    If you are planning on keeping the car for some time and wanting to do some customization of the systems, then VAGCOM is a must have.


    Sent from my iPhone using Audizine
    '09 C6.5 A6
    M: 3.0t, GIAC/AWE Stg II+, Roc*Euro Intake
    I: Soul Black, CF Trim, LEDs, Paddles, C7 Shifter, Escort 9500i, Blackvue Dashcam
    E: Ibis White, 15% Tint, Smoked Corners, Tinted Tails, S4 Rockers, S6 Blades, RS6 Grill, OEM Splitters (F/R)
    S: H&R Springs/Sways, Koni FSDs, Adams Rotors, Akebono Pads, SS Brake Lines, Paint Matched Calipers, Niche Misano M116 Wheels

  5. #5
    Established Member Two Rings JohnnyTooBad's Avatar
    Join Date
    Aug 14 2009
    AZ Member #
    46412
    Location
    NoVA

    Thanks. I did replace the battery today. The TPMS Malfunction issue stayed around for a bit, but I took the car out for a trip to a store about 15 minutes away. On my way home, I put the car in front of the house and when I put the car into reverse to put it where I wanted, the TPMS light went away. So it's all cleared up now. Now I just have the question about battery coding in another thread
    (DEAD) 2006 B7 A4 Avant 2.0T. Blue/Tan, Auto. 100% Stock, except for some window tint
    Replaced with a unicorn.... 2011 A6 Avant 3.0T, also Blue/Tan. Premium Plus, S-Line, Cold Weather Package.

  6. #6
    Veteran Member Four Rings christianb5s4's Avatar
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    Aug 24 2014
    AZ Member #
    277489
    Location
    Newport Beach, CA

    If you confirmed all 4 tires are properly inflated, you go to MMI and into the car setup and can manually reset the "TPMS".
    Imola 2001 Stage 3 S4: 313K - 2.4sec FATs - Completely Refreshed/Built Motor - SRM K24s w/ Custom Turbosmart wastegates - Ringer Racing 4+ - Etspec - Cinesnow WG/Oil Lines - SRM V3 Intercoolers - AA built trans - 4:1 Diff - JHM Trio - 034 - H&R Coilovers - FCP - Bosch Motorsports - OZ Racing - SRM/SSAC exhaust - Tons of New OEM parts

    2009 C6.5 A6 3.0T Prestige - stock, daily driver



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