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Old 05-22-2011, 06:47 PM
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Cool Trans failsafe
Hi all... last night while I was driving I seen the abs and dsc light flicker then couple miles later the dreaded trans failsafe program message appears!!! I limped home bout 2 miles Check engine light came on and register 3 codes...P0660 powertrain serial communication link... P1747 powertrain CAN BUS monitoring... P0720 powertrain output speed sensor circuit... measured battery voltage with the car off 12.1 volts... while running I was getting 13.5-14 volts... was thinking or hoping for a bad battery or alternator but doesn't seem to be the case ... I haven't really researched any of the codes yet, was just throwing a bone out ... Vets
edit: I forgot to mention that I had no speedometer and I just did rear brakes about 100 miles ago
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Last edited by dwhite832003; 06-15-2011 at 11:53 PM.
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Old 05-22-2011, 10:40 PM
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and you bust the right rear speed sensor whilst removing the wheel a while back so you replaced that sensor but you may have got crud into the hub which could be affecting the impulse reading for the sensor .
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Old 05-22-2011, 10:53 PM
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Thanks for the reply...
the bottom half of the sensor came out whole so I doubt that there was any crud that got into the hub... Could I have possibly let air into the brake system resulting in all of these codes nd fail safe???
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Old 05-22-2011, 11:03 PM
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hoping a bmw tech can chime in because it sounds like an electrical issue to me .
the crud thing in the reluctor is a guess .
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Old 05-24-2011, 07:28 PM
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nothing yet??? think I'll try an new battery... the tester @ Auto Zone said I need an new one anyways... wouldn't hurt to take a shot
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Old 06-06-2011, 11:22 PM
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Replaced Battery with Bosch Group 49 from Pep Boys $100 Also I had to cut a 2X4 to length in order for it to fit snugly




Can't help but feeling like I'm missing some options???



3 lonely pigtails with no gadgetry to mate with...
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Old 06-16-2011, 12:06 AM
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*UPDATE*
Took it to my main dealer last week.... they confirmed what I suspected, ABS control module... I sent the module out for a rebuild to a company called auto ecu (a couple of guys on here had good luck with them & they only wanted $200) in hopes of a rebuild... they called me back yesterday and said my unit had software failures and was beyond repair...
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Old 06-16-2011, 01:03 PM
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I had the same problem. Got a new module for $600 from my indy
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Old 07-23-2011, 01:38 AM
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Update #2
Hey guys thanks for all the help... Bought a new oem bosch unit W/1 year warranty from Auto Parts - Buy Car Parts with Free Shipping on Orders Above $50 from Buy Auto Parts for $500 if you buy through ebay... Installed it myself & had the dealer encode it for $130...1hrs labor... now I need a new steering angle sensor & encoding... these trucks are a pain in the ass...
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Last edited by dwhite832003; 07-23-2011 at 01:44 AM.
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Old 09-09-2011, 04:26 PM
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Quote:
Originally Posted by dwhite832003 View Post
Hey guys thanks for all the help... Bought a new oem bosch unit W/1 year warranty from Auto Parts - Buy Car Parts with Free Shipping on Orders Above $50 from Buy Auto Parts for $500 if you buy through ebay... Installed it myself & had the dealer encode it for $130...1hrs labor... now I need a new steering angle sensor & encoding... these trucks are a pain in the ass...
How's the X running now? Did the new control module fix the problem?
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