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Audi A6 C7 2013. - Audi does not start after a crash and burnout of the Airbag

aufan 17625 11
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  • #1 17225572
    aufan
    Level 7  
    Posts: 7
    Rate: 3
    Board Language: polish
    Hello,

    We have a problem to start the Audi A6 C7 after a crash, the impact was harmless but unfortunate because the sensor under the fender went off, activated the cushions and belts, so the pyrotechnic clamp fired, the car went out and did not start. After replacing the clamp, the car turns 1-2 times and does not start, there are many errors in the computer, no ABS communication and ubiquitous related errors. Air conditioning, etc. not working.

    What does not allow us to sleep is the inability to start the car, no communication with ABS and inactive air conditioning, for example, heating and ventilation of the seats works. Probably a lot of things will come to life when he blows his heart.

    Any suggestions ?

    Preliminary plan:
    -check the fuse and relay from ABS, as is known from ABS, various wonders can happen

    I have VCDS 17.8, but it doesn't define most of the errors in the computer:
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  • #2 17225883
    arieso
    Level 9  
    Posts: 29
    Help: 1
    Rate: 4
    Board Language: polish
    aufan wrote:
    Hello,

    We have a problem to start the Audi A6 C7 after a crash, the impact was harmless but unfortunate because the sensor under the fender went off, activated the cushions and belts, so the pyrotechnic clamp fired, the car went out and did not start. After replacing the clamp, the car turns 1-2 times and does not start, there are many errors in the computer, no ABS communication and ubiquitous related errors. Air conditioning, etc. not working.

    What does not allow us to sleep is the inability to start the car, no communication with ABS and inactive air conditioning, for example, heating and ventilation of the seats works. Probably a lot of things will come to life when he blows his heart.

    Any suggestions ?

    Preliminary plan:
    -check the fuse and relay from ABS, as is known from ABS, various wonders can happen

    I have VCDS 17.8, but it doesn't define most of the errors in the computer:
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  • #3 17225925
    aufan
    Level 7  
    Posts: 7
    Rate: 3
    Board Language: polish
    This is how the left beam, which goes to the bumper, is broken, the airbag sensor, the temperature sensor and the left sensor, for the engine cover closure, but the ABS cables are in the same bundle, but this section has remained intact.

    Maybe something from immo? However, here the engine would probably rotate for more than 1-2 revolutions, once I forgot to put immo pips in the remote control in another car and it turned but did not start, unless it is otherwise implemented in Audi.

    The worst thing is that vcds doesn't show error codes and I can't access another face at the moment.
  • #4 17226289
    arieso
    Level 9  
    Posts: 29
    Help: 1
    Rate: 4
    Board Language: polish
    crash data fired from the airbag controller? Does any message pop up on the car's display when I try to start?
  • #5 17226296
    aufan
    Level 7  
    Posts: 7
    Rate: 3
    Board Language: polish
    I haven't kicked anything out yet, honestly it's the first time I'm dealing with such topics so you can say that I'm learning. A few bugs are mostly crap, the most important ones are a parking brake error and a brake system failure.

    There is no other error when you try to fire.

    I have to have some more comprehensive facebook to decode these errors
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  • Helpful post
    #6 17226573
    OskiA3
    Level 11  
    Posts: 53
    Help: 5
    Rate: 37
    Board Language: polish
    Take the crash data out of the eggs and give the abs error number.
  • #7 17226710
    aufan
    Level 7  
    Posts: 7
    Rate: 3
    Board Language: polish
    Can vcds delete crash data?

    There is no carbon communication with the ABS Module
  • #8 17226878
    OskiA3
    Level 11  
    Posts: 53
    Help: 5
    Rate: 37
    Board Language: polish
    Vcds can't clear a crash, a bit more sophisticated hardware is needed ;)
  • #9 17226922
    aufan
    Level 7  
    Posts: 7
    Rate: 3
    Board Language: polish
    Would you name the equipment that takes over? He will look at what prices, maybe it will be cheaper than a visit of a specialist and learn something.
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  • #10 17226983
    arieso
    Level 9  
    Posts: 29
    Help: 1
    Rate: 4
    Board Language: polish
    OskiA3 wrote:
    Vcds can't clear a crash, a bit more sophisticated hardware is needed ;)


    With VCDS, you can remove the error of the airbag firing, at least in such a way that there are no errors in the controller or in the meter, confirmed on the GOLF MK7, Leon II and Octavia II
  • #11 17227782
    aufan
    Level 7  
    Posts: 7
    Rate: 3
    Board Language: polish
    The car started, today I covered the topic, the problem was in the abs bundle. The climate has come to life, in general most topics have normalized.

    However, I have further questions:

    1. should I replace the impact sensor under the fender, are they disposable or not?

    2. Does anyone know what the principle of their operation is?

    3. Can I safely connect the pyrotechnic fuse under the cartridge control, so far the plug from the cartridge control is disconnected?

    4.If I put on new pillows and belts, will nothing shoot again? I understand that it is all replaced on a disconnected battery.

    5. Is it possible to replace the pads first and then delete the crash data? Or the other way around?
  • #12 17230796
    OskiA3
    Level 11  
    Posts: 53
    Help: 5
    Rate: 37
    Board Language: polish
    arieso wrote:
    OskiA3 wrote:
    Vcds can't clear a crash, a bit more sophisticated hardware is needed ;)


    With VCDS, you can remove the error of the airbag firing, at least in such a way that there are no errors in the controller or in the meter, confirmed on the GOLF MK7, Leon II and Octavia II


    If you have an "ecu faulty" error or something like that, you won't delete it.

    Added after 1 [minutes]:

    aufan wrote:
    The car started, today I covered the topic, the problem was in the abs bundle. The climate has come to life, in general most topics have normalized.

    However, I have further questions:

    1. should I replace the impact sensor under the fender, are they disposable or not?

    2. Does anyone know what the principle of their operation is?

    3. Can I safely connect the pyrotechnic fuse under the cartridge control, so far the plug from the cartridge control is disconnected?

    4.If I put on new pillows and belts, will nothing shoot again? I understand that it is all replaced on a disconnected battery.

    5. Is it possible to replace the pads first and then delete the crash data? Or the other way around?


    1. I do not know, for the sake of the sake of peace I would mention.
    4. Nothing will work out, do it on a detached battery
    5. Replace the caves and then delete the error

    Added after 7 [minutes]:

    aufan wrote:
    Would you name the equipment that takes over? He will look at what prices, maybe it will be cheaper than a visit of a specialist and learn something.


    For example, carprog, but this exceeds the multiple of cleaning by a professional. Alternatively, disassemble the controller and clean the batch manually.
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Topic summary

✨ The discussion revolves around an Audi A6 C7 (2013) that fails to start after a minor crash, which triggered the airbag system and pyrotechnic clamp. The owner replaced the clamp but encountered multiple error codes, including no ABS communication and malfunctioning air conditioning. Suggestions include checking ABS fuses and relays, as well as extracting crash data from the airbag controller. The owner later resolved the starting issue by addressing a problem in the ABS wiring, which restored most functions. Further inquiries were made regarding the replacement of impact sensors, the safety of reconnecting pyrotechnic fuses, and the sequence of replacing airbags and clearing crash data.
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FAQ

TL;DR: On an Audi A6 C7 no-start after a crash, "With VCDS, you can remove the airbag firing error"—confirmed on 3 models—though crash data may remain. Check ABS wiring, then address SRS with proper tools. [Elektroda, arieso, post #17226983]

Why it matters: This helps A6 C7 owners fix post-crash no-starts safely and decide when specialist SRS tools are necessary.

Quick-Facts

Quick Facts

How do I fix an Audi A6 C7 that won’t start after airbags deployed?

Restore ABS communication first. A damaged ABS wiring bundle can block starting and HVAC. Inspect and repair the front harness near the bumper/fender, then clear codes and retest. How-To: 1. Scan ABS for power and communication. 2. Repair wiring damage in the ABS bundle. 3. Clear DTCs and verify start and climate. This exact fix restored both functions in the reported case. [Elektroda, aufan, post #17227782]

My engine cranks only 1–2 turns after a crash—what does it indicate?

Brief cranking with no start suggests network or safety interlock issues. In the reported case, the engine turned 1–2 revolutions, ABS communication was missing, and multiple modules showed errors. These symptoms point to communication loss rather than a traditional fuel or spark failure. [Elektroda, aufan, post #17225572]

Can VCDS clear crash data on an Audi A6 C7?

No. VCDS cannot clear crash data stored by the airbag control module. “Vcds can’t clear a crash, a bit more sophisticated hardware is needed.” Use dedicated SRS programmers or a specialist service to reset the module properly. [Elektroda, OskiA3, post #17226878]

So can VCDS at least remove the airbag warning display?

Sometimes. A poster confirmed clearing the visible airbag firing error so neither the controller nor cluster showed it. That outcome was confirmed on three models: Golf Mk7, Leon II, and Octavia II. This does not erase locked crash data in the module. [Elektroda, arieso, post #17226983]

Which tool clears crash data if VCDS doesn’t?

Carprog is a common pick for airbag crash-data work. Buying such hardware often costs more than several professional cleanings. Another route is opening the controller and clearing memory manually if you have the skills and equipment. [Elektroda, OskiA3, post #17230796]

Should I replace the front impact sensor under the fender after deployment?

Yes, replace it for peace of mind. The contributor recommended swapping the sensor after deployment. This helps avoid intermittent SRS faults during reassembly and future diagnostics. [Elektroda, OskiA3, post #17230796]

Will new airbags and belts deploy again when I reconnect the battery?

No. Replace components with the battery disconnected, then reconnect afterward. As the poster put it, do it “on a detached battery” to prevent unintended deployment during installation. Clear SRS faults only after parts are installed. [Elektroda, OskiA3, post #17230796]

What order should I follow: replace airbags/pretensioners or clear crash data?

Replace the airbags and belt pretensioners first, then clear the crash-related errors. This sequence avoids re-triggering faults and simplifies validation scans after reassembly. Finish by clearing all DTCs and confirming SRS readiness. [Elektroda, OskiA3, post #17230796]

Is it safe to reconnect the pyrotechnic battery clamp while the airbag controller is plugged in?

Work only with the battery disconnected. Reconnect the pyrotechnic terminal after replacing SRS parts and preparing to clear faults. The thread’s guidance is to perform all SRS component work “on a detached battery” to minimize risk. [Elektroda, OskiA3, post #17230796]

Why did climate control stop working after the crash and then return?

Loss of ABS communication can disrupt other modules on the vehicle network. After repairing the ABS wiring bundle, climate functions returned along with engine starting. The network stabilized once the ABS module rejoined communications. [Elektroda, aufan, post #17227782]

VCDS 17.8 shows no ABS communication and undecoded errors—what next?

Verify ABS fuses and relays, then inspect the harness route toward the bumper and fender. That area carries multiple sensors and the ABS wiring. Communication issues there can block diagnostics and cranking. [Elektroda, aufan, post #17225925]

Do I have to erase crash data for the car to start?

No. The car started after repairing the ABS wiring, while crash-data handling remained pending. Clearing crash data affects SRS readiness and warnings, not the ability to crank and start once communications are restored. [Elektroda, aufan, post #17227782]

What if the airbag module reports “ECU faulty” after a crash?

You cannot clear that error with VCDS. “If you have an ‘ecu faulty’ error... you won’t delete it.” Use specialized hardware or replace the module to resolve the fault state. [Elektroda, OskiA3, post #17230796]

What dash warnings might appear when trying to start after a crash?

Expect parking brake and brake system failure messages. The poster reported those warnings during start attempts, with no additional message appearing at that moment. These are consistent with broader network or ABS issues. [Elektroda, aufan, post #17226296]
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