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DSC/ABS/Brake Trifecta with Transmission Failsafe Prog.
ABS/DSC/Brake INPA codes: #105 - brake pedal switch signal #115 - pressure sensor signal interference Also in INPA, the brake pressure peaks to over 200 without any involvement from me. At least once a day, the rear brakes fully lock up and drag so I have to pull over. Here's a video with part of that: Part 1 of 3 (let me know if you want to see the other 2 parts. The 2 transmission codes are: OBD2: P0721 Output Speed Sensor Range/Performance INPA: transmission: 59 Festbremsdrehzahl ("stall speed") I've erased all codes but those listed above consistently come back. I'm not sure if the DSC and Transmission issues are related but I have this agonizing feeling they are. I have more details and experiences I'd be happy to share if anyone is interested. |
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#2
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Also I should point out, earlier today I removed the DSC control module. While I can't say if it fixed the brake drag issue, the transmission issue persists.
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#3
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I would start with checking the physical brake switch and the wires for that and the pressure sensor.
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2011 E70 • N55 (me) 2012 E70 • N63 (wife) |
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Will do, thank you very much!
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#5
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Quote:
Meanwhile, do you have any advice regarding the transmission failsafe issue? Now, when I put the X5 into gear (R or D) there's a faint whining noise coming from the bell housing. If this is a problem with the tranny itself, why did it suddenly happen after that failsafe issue registered? Also, after clearing the codes, no OBD2 codes have come back. The INPA code persists. Could it be the actual pressure sensor (or I'm told pulse generator) would be the culprit? I'm trying to avoid opening the gear box unless there's more clear indication that's the problem. |
#6
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most likely a bad ABS unit. i had a trifecta, i wasted money replacing part, finally i went to a junkyard and pulled an abs unit, and had a friend program it to my car. solved it.
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#7
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@don: OP said transmission also failsafe. When your abs was out did you also have transmission failsafe?
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2011 E70 • N55 (me) 2012 E70 • N63 (wife) |
#8
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Quote:
the cheap route will be: 1. take out your ABS and find retailers on ebay that will "repair e53 abs module" for about $100+ 2. do what i did, go to a junkyard and get a used ABS module (e53, specific to your motor i believe), or buy one on ebay. and have someone with the software flash it to match your car. video: to code replacement abs module: https://www.youtube.com/watch?v=vx8FwUCkHys Note: you can rule out the wheel sensors, either with a multimeter, or connect a BMW specific OBD scanner to the car, and see the sensor readings while you drive it. |
#9
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My new scanner reads all the DSC/ABS Components directly. I was amazed to see the brake pressure real time.
If you are going to be working on BMW get the foxwell nt510 I think you can even program the abs module should you need to replace it. You can use it to activate abs. Also, I just bought a complete repair manual in PDF for $13 on eBay. Has every wiring diagram etc will help find this and any other problem Sent from my iPhone using Tapatalk Pro
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2011 E70 • N55 (me) 2012 E70 • N63 (wife) |
#10
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You measure VOLTAGE not current on the pressure sensor. you need to measure voltage from the ground wire to the sensor output while the car is in the on position (engine can be on or off)
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__________________
2011 E70 • N55 (me) 2012 E70 • N63 (wife) |
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