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Thread: Occasional Limp Mode Question

  1. #1
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    Occasional Limp Mode Question

    My car will start up/run fine, but occasionally when I shift out of park into drive or reverse for the first time, there will be a delay of 2-3 seconds, then a huge jolt as the car slams into gear. The cluster lights up PRNDS in solid red, which I'd guess is the tcu putting the car into limp mode?

    It typically happens in the morning when leaving for work and the car has sat all night, but bit every time. I can shut the car off/on and usually everything is fine after that. A few times I had to restart the car 2 or 3 times.

    I thought it was my tcu going bad so I swapped the stock one in for one with a. Giac chip, but still have the same issue occasionally. (No more/less frequent though)

    No CEL or codes to be read when it happens. Any suggestions on where to start looking??

    This is the second transmission, first was replaced at 50k by Audi and the car has 85k now.

    Thanks for any ideas!

  2. #2
    Registered User mrdave's Avatar
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    Are you reading codes from the TCU also or just the ECU?

    My initial thought would be valve body in the trans.

  3. #3
    Registered User hahnmgh63's Avatar
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    In addition to what mrdave said you may also want to have your tranny fluid level checked. Even if it was done by the dealer it can be tricky, especially since it was a new tranny and completely empty. I fill the tranny per the procedure then drive it a quarter mile or so, then shut it down and let it cool a bit then re-check it again. Almost always has a too little as the air is purged out of all the lines.
    2003 White RS6 2013 Midnight Blue S5
    2013 Daytona RS5 2x944 Turbo's 1974 911 w/'91 3.6ltr motor
    Roy, WA

  4. #4
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    Thanks! I'll check the fluid level and hit the Ross tech wiki to see if there's any different way to scan the tcu, and report back any codes I may find in it.

  5. #5
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    Yesterday the car went into limp 3x in a row and finally my face was warmed by the glow of the much beloved CEL.

    Here's a dump of the vcds tcu and auto scan. Clearly some other electrical gremlins going on, so please feel free to comment on anything that stand out to you. (the car had already been wired for an RSN-E so looks like I'll have to dig into that a bit at some point)
    Looks like the transmission range sensor is a common spot to get gunked up and replacing didn't look too bad when I was under it today. Does anyone have a preferred source for these?
    I think the advice above to drain/fill the trans fluid is good as well, I'll start prepping for that as well.

    Code:
    --------------------------------------------------------------------------------
                  Address 02: Auto Trans       Labels: 01L-927-156.lbl
    Control Module Part Number: 4B0 927 156 FL
      Component and/or Version: AG5 01L 4.2l5VT USA 0305
               Software Coding: 0000002
                Work Shop Code: WSC 00000 785 00200
                          VCID: 76B51849D4D26347B49-5160
    2 Faults Found:
    
    
    17090 - Transmission Range Sensor (F125) 
                P0706 - 003 - Implausible Signal - Intermittent - MIL ON
    17087 - Brake Switch (F) 
                P0703 - 003 - Electrical Malfunction - Intermittent
    
    --------------------------------------------------------------------------------
    --------------------------------------------------------------------------------
    
                    Address 02: Auto Trans
    Control Module Part Number: 4B0 927 156 FL
      Component and/or Version: AG5 01L 4.2l5VT USA 0305
               Software Coding: 0000002
                Work Shop Code: WSC 00000
                          VCID: 76B51849D4D26347B49-5160
    
    
    Flash Status
         Programming Attempts: 0
         Successful Attempts: 0
         Programming Status: 00000000
         Required Conditions: 00000000
    Misc.
    VCDS Info:
           VCID: 76B51849D4D26347B49-5160
           Labels: 01L-927-156.LBL
    
    --------------------------------------------------------------------------------
    --------------------------------------------------------------------------------
    
    Wednesday,10,October,2018,13:51:07:21999
    VCDS -- Windows Based VAG/VAS Emulator Running on Windows 10 x64
    VCDS Version: 18.9.0.2 (x64)  HEX-V2 CB: 0.4436.4
    Data version: 20180927 DS296.0
    www.Ross-Tech.com
    
    --------------------------------------------------------------------------------
    --------------------------------------------------------------------------------
    
    Chassis Type: 4B (4B - Audi A6/S6/RS6/allroad C5 (1998 > 2005))
    Scan: 01 02 03 06 08 15 16 17 18 22 34 35 36 37 45 55 56 57 65 67
              75 76 77
     
    VIN: WUAPV64B03N904777   
    -------------------------------------------------------------------------------
    Address 01: Engine        Labels: 077-907-558-BCY.lbl
       Part No: 4D1 907 558 
       Component: 4.2l V8/5VT     G   0002  
       Coding: 0006752
       Shop #: WSC 65728 1018 854933
       VCID: 6B83393D9F90AEAF5B7-5160
    
    
    2 Faults Found:
    18032 - MIL Request Signal Active (Check TCM for errors too!) 
                P1624 - 008 - 
    16955 - Brake Switch (F) 
                P0571 - 008 - Implausible Signal - Intermittent
    Readiness: 0000 1100
    
    
    -------------------------------------------------------------------------------
    Address 02: Auto Trans        Labels: 01L-927-156.lbl
       Part No: 4B0 927 156 FL
       Component: AG5 01L 4.2l5VT USA 0305  
       Coding: 0000002
       Shop #: WSC 00000 785 00200
       VCID: 76B51849D4D26347B49-5160
    
    
    2 Faults Found:
    17090 - Transmission Range Sensor (F125) 
                P0706 - 003 - Implausible Signal - Intermittent - MIL ON
    17087 - Brake Switch (F) 
                P0703 - 003 - Electrical Malfunction - Intermittent
    
    -------------------------------------------------------------------------------
    Address 03: ABS Brakes        Labels: None
       VCID: 55F77FC52C14085F9D3-51F2
    
    No Faults Found
      or DTCs not supported by controller
      or a communication error occurred
    
    -------------------------------------------------------------------------------
    Address 06: Seat Mem. Pass        Labels: None
       Part No: 4B0 959 760 C
       Component: Sitzmemory R1 BF    0205  
       Coding: 00003
       Shop #: WSC 00000  
       VCID: 2D07F7256434609F053-4AE0
    
    1 Fault Found:
    01731 - Switch for Seat Height Front Pass. Seat (E65); Down 
                28-10 - Short to Plus - Intermittent
    
    -------------------------------------------------------------------------------
    Address 08: Auto HVAC        Labels: 4B0-820-043-MY2.lbl
       Part No: 4B0 820 043 AR
       Component: A6-Klimavollautomat 0208  
       Coding: 00010
       Shop #: WSC 00000  
       VCID: 6A8D3C39955AB7A7201-2578
    
    
    3 Faults Found:
    00779 - Outside Air Temp Sensor (G17) 
                30-10 - Open or Short to Plus - Intermittent
    00819 - High Pressure Sensor (G65) 
                30-10 - Open or Short to Plus - Intermittent
    01592 - Air Quality Sensor (G238) 
                57-00 - Electric Circuit Failure
    
    -------------------------------------------------------------------------------
    Address 15: Airbags        Labels: 4B0-959-655-AI84.lbl
       Part No: 4B0 959 655 Q
       Component: Airbag 8.4EP        3001  
       Coding: 0000607
       Shop #: WSC 00000 785 00200
       VCID: 3E25C069BC62EB07AC9-5184
    
    
    No fault code found.
    -------------------------------------------------------------------------------
    Address 17: Instruments        Labels: 4B0-920-xxx-17.lbl
       Part No: 4B0 920 983 D
       Component: KOMBI+WEGFAHRS. VDO D12  
       Coding: 03284
       Shop #: WSC 07117  
       VCID: 290F033550EC7CBFE9B-5160
       WUAPV64B03N904777     AUZ7Z0C2424830
    
    
    1 Fault Found:
    01311 - Information Data Bus 
                80-00 - Single-Wire Operation
    
    
    -------------------------------------------------------------------------------
    Address 35: Centr. Locks        Labels:. 4B0-962-258.lbl
       Part No: 4B0 962 258 M
       Component: Central Lock/Alarm  D38  
       Coding: 15981
       Shop #: WSC 00000  
       VCID: 3333E15D8210366F537-4EEA
    
    
    1 Fault Found:
    01562 - Rear right door 
                59-10 - Can't Unlock - Intermittent
    
    
    -------------------------------------------------------------------------------
    Address 36: Seat Mem. Drvr        Labels: None
       Part No: 4B0 959 760 B
       Component: Sitzmemory R1 F     0204  
       Coding: 00001
       Shop #: WSC 00000  
       VCID: 2C01FA215F2E699712D-4AE0
    
    
    5 Faults Found:
    01445 - Sensor for Driver Seat Fore/Aft (G227) 
                29-10 - Short to Ground - Intermittent
    01446 - Sensor for Driver Seat; Seatback Adjust (G230) 
                29-10 - Short to Ground - Intermittent
    01447 - Sensor for Driver Seat; Height Adjust (G231) 
                29-10 - Short to Ground - Intermittent
    01448 - Sensor for Driver Seat; Tilt Adjust (G232) 
                29-10 - Short to Ground - Intermittent
    01446 - Sensor for Driver Seat; Seatback Adjust (G230) 
                20-00 - Malfunction in Basic Setting
    
    
    -------------------------------------------------------------------------------
    Address 37: Navigation        Labels: 8E0-035-192-RNSE.clb
       Part No SW: 8P0 035 192     HW: 8P0 035 192 
       Component: RNS-E US        H72 0260  
       Revision:      08S    Serial number: AUZBZ7E0370945
       Coding: 0509678
       Shop #: WSC 11111 781 01234
       VCID: 6C813A219AAEA99752D-5118
    
    
    6 Faults Found:
    00532 - Supply Voltage B+ 
                002 - Lower Limit Exceeded - Intermittent
                 Freeze Frame:
                        Fault Status: 00100010
                        Fault Priority: 7
                        Fault Frequency: 1
                        Reset counter: 50
                        Time Indication: 0
                        Date: 2018.05.31
                        Time: 10:29:58
    
    
                 Freeze Frame:
                        Voltage: 12.20 V
    
    
    00446 - Function Limitation due to Under-Voltage 
                002 - Lower Limit Exceeded - Intermittent
                 Freeze Frame:
                        Fault Status: 00100010
                        Fault Priority: 7
                        Fault Frequency: 1
                        Reset counter: 50
                        Time Indication: 0
                        Date: 2018.05.31
                        Time: 10:12:35
    
    
                 Freeze Frame:
                        Voltage: 12.20 V
                        Mileage: 655350 km
                        Count: 65535
                        Clock: 255:255
    
    
    00858 - Connection; Radio Intermediate Frequency (IF) Output to Antenna Amplifier 
                007 - Short to Ground - Intermittent
                 Freeze Frame:
                        Fault Status: 00100111
                        Fault Priority: 5
                        Fault Frequency: 211
                        Reset counter: 50
                        Time Indication: 0
                        Date: 2018.05.31
                        Time: 12:01:17
    
    
                 Freeze Frame:
                        Mileage: 655350 km
                        Count: 1010
                        Clock: 13:33
    
    
    00857 - CD Changer Unit (R41) 
                004 - No Signal/Communication
                 Freeze Frame:
                        Fault Status: 01100100
                        Fault Priority: 5
                        Fault Frequency: 1
                        Reset counter: 160
                        Time Indication: 0
                        Date: 2018.05.16
                        Time: 21:00:32
    
    
    01326 - Control Module for Multi-Function Steering Wheel (J453) 
                004 - No Signal/Communication
                 Freeze Frame:
                        Fault Status: 01100100
                        Fault Priority: 5
                        Fault Frequency: 1
                        Reset counter: 160
                        Time Indication: 0
                        Date: 2018.05.16
                        Time: 20:59:48
    
    
    00467 - TV Tuner (R78) 
                004 - No Signal/Communication
                 Freeze Frame:
                        Fault Status: 01100100
                        Fault Priority: 5
                        Fault Frequency: 1
                        Reset counter: 160
                        Time Indication: 0
                        Date: 2018.05.16
                        Time: 21:01:01
    
    
    
    
    -------------------------------------------------------------------------------
    Address 55: Headlight Range        Labels: 4Z7-907-357.lbl
       Part No: 4Z7 907 357 
       Component: dynamische LWR       D09  
       Coding: 00040
       Shop #: WSC 00000  
       VCID: 04517281973E41D7BAD-4B1E
    
    
    No fault code found.
    
    
    -------------------------------------------------------------------------------
    Address 56: Radio        Labels: 8E0-035-192-RNSE.clb
       Part No SW: 8P0 035 192     HW: 8P0 035 192 
       Component: RNS-E US        H72 0260  
       Revision:      08S    Serial number: AUZBZ7E0370945
       Coding: 0509678
       Shop #: WSC 11111 781 01234
       VCID: 6C813A219AAEA99752D-5118
    
    
    6 Faults Found:
    00532 - Supply Voltage B+ 
                002 - Lower Limit Exceeded - Intermittent
                 Freeze Frame:
                        Fault Status: 00100010
                        Fault Priority: 7
                        Fault Frequency: 1
                        Reset counter: 50
                        Time Indication: 0
                        Date: 2018.05.31
                        Time: 10:29:58
    
    
                 Freeze Frame:
                        Voltage: 12.20 V
    
    
    00446 - Function Limitation due to Under-Voltage 
                002 - Lower Limit Exceeded - Intermittent
                 Freeze Frame:
                        Fault Status: 00100010
                        Fault Priority: 7
                        Fault Frequency: 1
                        Reset counter: 50
                        Time Indication: 0
                        Date: 2018.05.31
                        Time: 10:12:35
    
    
                 Freeze Frame:
                        Voltage: 12.20 V
                        Mileage: 655350 km
                        Count: 65535
                        Clock: 255:255
    
    
    00858 - Connection; Radio Intermediate Frequency (IF) Output to Antenna Amplifier 
                007 - Short to Ground - Intermittent
                 Freeze Frame:
                        Fault Status: 00100111
                        Fault Priority: 5
                        Fault Frequency: 211
                        Reset counter: 50
                        Time Indication: 0
                        Date: 2018.05.31
                        Time: 12:01:17
    
    
                 Freeze Frame:
                        Mileage: 655350 km
                        Count: 1010
                        Clock: 13:33
    
    
    00857 - CD Changer Unit (R41) 
                004 - No Signal/Communication
                 Freeze Frame:
                        Fault Status: 01100100
                        Fault Priority: 5
                        Fault Frequency: 1
                        Reset counter: 160
                        Time Indication: 0
                        Date: 2018.05.16
                        Time: 21:00:32
    
    
    01326 - Control Module for Multi-Function Steering Wheel (J453) 
                004 - No Signal/Communication
                 Freeze Frame:
                        Fault Status: 01100100
                        Fault Priority: 5
                        Fault Frequency: 1
                        Reset counter: 160
                        Time Indication: 0
                        Date: 2018.05.16
                        Time: 20:59:48
    
    
    00467 - TV Tuner (R78) 
                004 - No Signal/Communication
                 Freeze Frame:
                        Fault Status: 01100100
                        Fault Priority: 5
                        Fault Frequency: 1
                        Reset counter: 160
                        Time Indication: 0
                        Date: 2018.05.16
                        Time: 21:01:01
    
    -------------------------------------------------------------------------------
    Address 75: Telematics        Labels: 8E0-035-616.lbl
       Part No SW: 8E0 035 616 A    HW: 8E0 035 616 A
       Component: Telematik USA1      
       Coding: 0002003
       Shop #: WSC 07117 444 53517
       VCID: 2313111D37C0A6EFA37-513C
    
    
    2 Faults Found:
    01531 - Emergency Battery 
                002 - Lower Limit Exceeded - MIL ON
    00469 - Infotainment Databus in Single Wire Operation 
                012 - Electrical Fault in Circuit - MIL ON
    
    
    -------------------------------------------------------------------------------
    Address 76: Park Assist        Labels: 8Z0-919-283.lbl
       Part No: 8Z0 919 283 
       Component: Parkingsyst. A6 RDW D08  
       Coding: 01116
       Shop #: WSC 00000  
       VCID: 025D74998D2A4FE7881-5118
    
    
    No fault code found.
    
    
    End----------(Elapsed Time: 04:40, VBatt start/end: 12.1V/11.9V)-----------

  6. #6
    Registered User mrdave's Avatar
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  7. #7
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    Brilliant!! The op in that thread was the previous owner of my car! Perhaps he never replaced the switch after all.
    I'll double check connections, but probably cheap maintaince to swap it out.

    Thanks again! And if you guys have any insight into all the other electrical oddities in the codes, I'm all ears

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