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Intermittent Traction Control Light and ABS Light
Recently, I've been having intermittent Traction Control and ABS lights come on in the dash. There doesn't appear to be any pattern as to when it happens. It occurs at slow and fast speeds. They may stay on for a second or two or upwards of an hour. It doesn't appear to have any adverse effect on the car.
I've done some searching here and one of the threads shows cleaning the ABS sensors, which I may tackle. I've only had a quick look at one of the wheels as I don't have any axle stands (will be borrowing some over Christmas) and found the ABS sensor. What else could be causing this to happen, and where else should I be looking once I have the car on stands? I bought a cheap VCDS cable off eBay and there aren't any errors showing up regarding brakes or the like. Any thoughts would be appreciated. |
What about errors in other controllers. If instrument cluster have no communication with ABS controller it will put the lights on. If signal from MAF or throttle body or throttle position sensor is wrong ECU cannot calculate the load properly and will put the lights on.
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Since I got it serviced and the F125 switch and lambda sensors replaced in October, only one error has popped up (Address 35), and that seems random. I sometimes get another intermittent one in Address 37 and 56, but haven't noticed any difference in behaviour. This is a copy of the scan I did today:
Sunday,22,December,2013,14:16:53:32264 VCDS Version: Release 11.11.3 Data version: 20120401 Chassis Type: 4D - Audi A8 D2 Scan: 01 03 08 11 15 16 17 18 25 35 37 45 55 56 57 65 67 75 76 77 02 VIN: WAUZZZ4D92N002072 ------------------------------------------------------------------------------- Address 01: Engine Labels: None Part No: 4D0 907 558 AB Component: 3.7L V8/5V G 0002 Coding: 11753 Shop #: WSC 23143 VCID: 6DDBD76D278ADF1 WAUZZZ4D92N002072 AUZ7Z0A1855153 No fault code found. Readiness: 0110 1101 ------------------------------------------------------------------------------- Address 03: ABS Brakes Labels: 8D0-907-389.lbl Part No: 4D0 907 389 E Component: ABS/ESP allrad D56 Coding: 08397 Shop #: WSC 02313 VCID: 31630B1DFB327B1 No fault code found. ------------------------------------------------------------------------------- Address 08: Auto HVAC Labels: 4D0-820-043-MYX.lbl Part No: 4D0 820 043 P Component: A8-Klimavollautomat D11 Coding: 00081 Shop #: WSC 00315 VCID: 2953E37DD3E2031 No fault code found. ------------------------------------------------------------------------------- Address 15: Airbags Labels: 4D0-959-655-AI8.lbl Part No: 4D0 959 655 T Component: Airbag Front+Kopf 5001 Coding: 01417 Shop #: WSC 02335 VCID: 438F51D5518EF91 No fault code found. ------------------------------------------------------------------------------- Address 17: Instruments Labels: 4D0-919-033-MYX.lbl Part No: 4D0 919 035 AQ Component: KOMBI+WEGFAHRS.VDO D37 Coding: 16483 Shop #: WSC 00209 VCID: 75EBFF0D4FDA171 WAUZZZ4D92N002072 AUZ7Z0A1855153 No fault code found. ------------------------------------------------------------------------------- Address 35: Centr. Locks Labels: 8D0-862-257.lbl Part No: 8L0 862 257 P Component: CV-Pump, Alarm, RC D17 Coding: 16203 Shop #: WSC 00315 VCID: 428154D14E94F09 1 Fault Found: 01134 - Alarm Horn (H12) 77-00 - Internal Supply Voltage ------------------------------------------------------------------------------- Address 37: Navigation Labels: 4B0-035-192-RNSD-37.lbl Part No: 4D0 035 192 N Component: RNS 4.1 H05 BNO 0140 VCID: 2A511C71D6E4089 No fault code found. ------------------------------------------------------------------------------- Address 45: Inter. Monitor Labels: None Part No: 4D0 951 177 B Component: Innenraumueberw. D06 Coding: 00001 Shop #: WSC 00000 VCID: 2855E679C8E83A9 No fault code found. ------------------------------------------------------------------------------- Address 56: Radio Labels: 4B0-035-192-RNSD-56.lbl Part No: 4D0 035 192 N Component: Radio BNO 0001 Coding: 00205 Shop #: WSC 02314 VCID: 2A511C71D6E4089 No fault code found. ------------------------------------------------------------------------------- Address 57: TV Tuner Labels: 4D0-919-146.clb Part No: 4D0 919 146 B Component: TV Tuner H06 0704 Coding: 0000030 Shop #: WSC 00000 000 00000 VCID: 2855E67998E83A9 No fault code found. ------------------------------------------------------------------------------- Address 76: Park Assist Labels: 4D0-919-283.lbl Part No: 4D0 919 283 Component: Parkingsystem A8 RDW D07 Coding: 01108 Shop #: WSC 00209 VCID: E8D5267988687A9 No fault code found. ------------------------------------------------------------------------------- Address 02: Auto Trans Labels: 01V-927-156.lbl Part No: 4D0 927 156 DT Component: AG5 01V 3.7l5V RdW 1920 Coding: 00001 Shop #: WSC 00000 VCID: 7EF9E0217AEC549 No fault code found. End --------------------------------------------------------------------- |
ABS Sensors, or possibly a failing wheel bearing too, putting the reluctor ring out of sync with the sensor.
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When the lights come on connect VCDS, go to ABS controller and in measuring blocks check speed for each of the wheels while driving. If one is different you know where the problem is and do not need to clean all sensors in this terrible weather( it's not that bad if you can do it indoors but saves extra hustle anyway). It helps if you can have somebody else to drive the car while you are checking values
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Had the same problem on my s8, when i floor it the light come on and sometime not, no error codes on vcds about it. changed the maf sensor and never seen it again. Could not feel it on car that the maf was broken but could read out fron vcds that the values was low.
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On the few times I've been out in the car since my original postings, I've seen the lights maybe twice, and that was for literally a few seconds each time. Was just driving along normally. No acceleration or braking. Wasn't in the best of health over the last couple of weeks, so still no axle stands... and it's too wet and miserable out there anyway.
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Hi,
Was looking for something else completely when I came across this so thought I would chip in even although the thread is months old :) I had the same problem. Looked at MAF, ABS etc etc. I ended up cleaning the throttle body thoroughly and readapting it. Haven't seen the lights since. I presume it was the TB not knowing to what degree it was actually open or closed throwing all the other sensors out of sync. Might be worth a try for you too? |
Just had this occurence with the traction control and abs lights coming on. Driven up from Gosport to Newcastle then on to Hexham yesterday with a snowstorm thrown in for good measure. Prior to the lights coming on had a noticable reduction in power and feeling like a fuel starvation issue. Reading half a tank so pulled in and filled up with 54ltrs fuel. Car behaved perfectly for the next 20 miles back to base.
As mentioned above, the weather has been pretty foul and the car looks as if it has been on a wet weather rally circuit. Thinking dirty ABS sensors but would it cause engine performance issues as well? |
I would scan the car with VCDS first and go from there. I've had both front abs sensors go and they didn't reduce performance or anything like that.
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Cant scan as my computer isnt with me. :( |
When abs works you feel the brake pedal vibrate and there is a distinct buzz of the abs pump, the brakes will never just randomly grab like when driving with adaptive cruise control etc.
My front abs sensors started to play up when going over bumps and the above is exactly what I would get. The fault was later narrowed down to the piece of ABS sensor which goes from the strut to the body, it simply got worn out after 20+ years. If it is the sensors for you, i made a guide showing how to make them for around £30 instead of paying £399 for new ones. |
A blast from the past. From what I remember at the time, I removed and cleaned all the ABS sensors, which didn't seem that bad, followed the suggestion by ainarssems of monitoring the measuring blocks and they were fine. I also replaced a MAF at some point, but don't remember if it was to do with the same issue.
If the lights came on and went off again, scanning for errors may not show up anything if you switch the engine off, as they clear themselves. Not sure about anyone else, but I've never plugged in the VCDS cable when the ignition was on or engine running, as worried it might cause damage. Not sure if it's related and don't want to muddy the waters, but since you'll be plugging in VCDS, check out the brake switch measuring blocks in module 01-Engine, address 66. Untouched it should read 0000, a slight push with your finger should read 1010, and a little bit more pressure should read 1011. Only because you mentioned a 'reduction in power', and if the ECU thinks the brake switch has been depressed, it will reduce the power. |
One of the biggest advantages of VCDs is loggin live data while the engine is running and the car is moving.
You can even save it to a text file and plot a graph with excell, I did that when diagnosing my abs sensors. |
I found a VAG guy in Hexham who scanned the car, no faults present. Car was covered in 'muck n bullets' so kindly power washed it down. Driven over 120 miles today and not a murmur, drove in its normal 'sublime' mode. Took it back for another scan and still nothing logged.
Im travelling back down south tomorrow (via the A8 Parts Store in Stockton) so will see what occurs. Hopefully nothing. Thanks for all your input. |
Well, found some time in break from work to scan the car using VCDS light. Now have some codes. One thing of note that there is a lot of intermittent codes popping up so thinking loose connections somewhere? :Confused:
VCDS-Lite Windows Based VAG/VAS Emulator Version: Release 1.2 www.Ross-Tech.com Workshop Code: 000 00000 Self-Diagnosis Log Sunday, 26 March 2023, 15:19:45:59133 VIN Number: WAUZZZ4DX2N007670 License Plate: PL02FKF Mileage: 174544 Repair Order: Chassis Type: 4D - Audi A8 D2 Scan: 25,01,03,08,11,15,16,17,18,35,37,45,55,56,57,65,67 ,75,76,77,02 ------------------------------------------------------------------------------- Address 08: Auto HVAC Labels: Redir Fail! Controller: 4D0 820 043 Q Component: A8-Klimavollautomat D13 Coding: 00081 Shop #: WSC 02313 VCID: 2A276756C5E7 No fault code found. ------------------------------------------------------------------------------- Address 15: Airbags Labels: 4D0-959-655-AI8.LBL Controller: 4D0 959 655 T Component: Airbag Front+Kopf 5001 Coding: 01417 Shop #: WSC 02335 VCID: 43F92AF2428D 1 Fault Found: 01219 - Rear Airbag Igniter; Driver Side (N201) 33-00 - Resistance too Low ------------------------------------------------------------------------------- Address 17: Instruments Labels: 4D0-919-033-MYW.LBL Controller: 4D0 919 035 BA Component: KOMBI+WEGFAHRS.VDO D39 Coding: 00483 Shop #: WSC 02313 VCID: 66BFD366117F WAUZZZ4DX2N007670 AUZ7Z0A1942430 No fault code found. ------------------------------------------------------------------------------- VCDS-Lite Self-Diagnosis Log Sunday, 26 March 2023, 15:19:45:59133 Page 2 VIN Number: WAUZZZ4DX2N007670 License Plate: PL02FKF Address 35: Centr. Locks Labels: 8D0-862-257.LBL Controller: 8L0 862 257 P Component: CV-Pump, Alarm, RC D17 Coding: 15178 Shop #: WSC 02313 VCID: 42F72FF65D97 3 Faults Found: 01370 - Alarm triggered by Interior Monitoring 35-00 - - 01369 - Alarm triggered by Hood Switch 35-00 - - 01134 - Alarm Horn (H12) 49-00 - No Communications ------------------------------------------------------------------------------- Address 37: Navigation Labels: None Controller: 4D0 035 192 M Component: RNS 4.2 H06 BNO 0102 VCID: 2925985AC0E1 1 Fault Found: 00862 - Antenna for GPS Navigation (R50/R52) 44-00 - Short Circuit ------------------------------------------------------------------------------- Address 45: Inter. Monitor Labels: None Controller: 4D0 951 177 B Component: Innenraumueberw. D06 Coding: 00001 Shop #: WSC 00000 VCID: 28239D5EDBEB No fault code found. ------------------------------------------------------------------------------- Address 55: Xenon Range Labels: 4Z7-907-357.LBL Controller: 4Z7 907 357 Component: dynamische LWR D07 Coding: 00001 Shop #: WSC 00000 VCID: 047BE9EE0703 No fault code found. ------------------------------------------------------------------------------- VCDS-Lite Self-Diagnosis Log Sunday, 26 March 2023, 15:19:45:59133 Page 3 VIN Number: WAUZZZ4DX2N007670 License Plate: PL02FKF Address 56: Radio Labels: None Controller: 4D0 035 192 M Component: Radio BNO 0001 Coding: 00207 Shop #: WSC 00652 VCID: 2925985AC0E1 1 Fault Found: 00852 - Loudspeaker(s); Front 36-00 - Open Circuit ------------------------------------------------------------------------------- Address 76: Park Assist Labels: 4D0-919-283.LBL Controller: 4D0 919 283 PÆu Component: arkingsystem A8 RDW D07 Coding: 01108 Shop #: WSC 00000 VCID: 7399BA3252AD No fault code found. ------------------------------------------------------------------------------- Address 02: Auto Trans Labels: 01L-927-156.LBL Controller: 4D0 927 156 EC Component: AG5 01L 4.2l5V RdW 1010 Coding: 00101 Shop #: WSC 02313 VCID: 6EAFAB46398F 1 Fault Found: 18265 - Load Signal: Error Message from ECU P1857 - 35-10 - - - Intermittent End -------------------------------------------------------------------------------------------------- Also: Control Module Part Number: 4D0 907 559 AA Component and/or Version: 4.2L V8/5V G 0002 Software Coding: 10753 Work Shop Additional Info: WAU CZoZdZe4:D WXS2NC0 0007060700 AUZ7Z0A1942430 6 Faults Found: 17931 - Crash Signal from Airbag Controller: Implausible Signal P1523 - 35-00 - - 17981 - Left Engine Mount Solenoid Valve (N144): Open Circuit P1573 - 35-10 - - - Intermittent 17834 - EVAP Purge Valve (N80): Open Circuit P1426 - 35-10 - - - Intermittent 17985 - Right Engine Mount Solenoid Valve (N145): Open Circuit P1577 - 35-10 - - - Intermittent 17841 - Secondary Air Pump Relay (J299): Open Circuit P1433 - 35-10 - - - Intermittent 16486 - Mass Air Flow Sensor (G70): Signal too Low P0102 - 35-10 - - - Intermittent Readiness: 0010 0001 I have managed to clear all intermittent codes. |
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The crash signal implausible is a peculiarity of this car that I couldn't solve. I changed all the ecus which can interact with the crash signal, to no avail, checked the wiring - all fine, sometimes it'll clear and go away for a bit, sometimes it comes back straight away. Its most puzzling. It could be something to do with canbus identities, since this one had so many replacement parts. Its the one code I couldn't get to the bottom of, but doesn't appear to affect anything and doesn't give any warning lights.
The engine codes are likely a bad connection in the ECU box. Pop the lid, and pull each connector in turn and give them a spray of WD40 and then put them back. I'll have a look at the diagrams when I get a chance and see if they all go through the same connector, or have a common supply or ground. Keep a close eye on the MAF error and load signal implausible in the TCU as that can have an impact on the gearbox, both shift quality and consequently longevity. If it has a common supply or ground with the other bits that are having issues then it could simply not be giving a signal at times, but if its actually failed and giving a duff load signal that needs sorting asap. I think its not terrible to change the rear seat airbags if that code is persistent after fiddling with the connector. I have plenty of spare seats which can donate one. |
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I searched that 17931 error code and came across the following post - note the 'Special Notes'. With your understanding of these cars, does it sound like a feasible solution? http://wiki.ross-tech.com/wiki/index...1/P1523/005411 I've also attached a section of the wiring diagram (p.25) from Current Flow Basic equipment From model year 2001.pdf showing the 'crash wire' (A125). E3 is the hazard warning switch. |
Interesting. I don't think I found this but it does sound feasible. Not sure if I changed the hazard switch or not tbh but its worth a try.
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Thanks for all your input Steamship and MJ. Looks like a job for the weekend owing to lack of time and dicey weather. I think it is within my limited capability.
MJ can I substitute WD40 for contact cleaner? Is it prudent to get hold of a new hazard flash unit if such an item is available? Quote:
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All those engine components are run from the same fuse - S117 'control element fuse' which is a yellow 20A in the ECU box. I'd suggest replacing the fuse and giving the fuse holder terminals a spray with contact cleaner / WD40. Its likely there is some corrosion or grot on the terminals from when it was damp in there.
I have a box of hazard switches if you want one posting, or are passing to pick one up +++ |
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I noticed some condensation to the underside of the ECU box lid. You would think there must be some way of ventilating this box to alleviate this? Crash implausible error has disappeared. +++ All intermittent have gone. +++ On to the Airbag issue. |
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