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Code U0101 and hard shift into drive AT light on on dash

Tiny
ELLISONE
  • MEMBER
  • 2004 MAZDA 6
  • 3.0L
  • V6
  • 2WD
  • AUTOMATIC
  • 125,000 MILES
Car started shifting hard into drive and the AT light was on checked codes and got a U0101 but I noticed something when I cleared the code the car would shift into all gears normally but then light would come back on after about five min and hard shift into drive would start up again and as soon as I would clear the code again it would start working normally again for five min. Did this four times in a row can you tell me if this is pointing to a specific problem or area of the transmission like the failure of the TCM?
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Wednesday, August 12th, 2015 AT 7:46 PM

5 Replies

Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
This code is a fault of communication error between the PCM and TCM, Most likely the TCM is faulty. Start by checking the fuses for the TCM.
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Thursday, August 13th, 2015 AT 8:48 AM
Tiny
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  • 32 POSTS
Thanks for your help KHLow2008
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Thursday, August 13th, 2015 AT 1:30 PM
Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
You're welcome. Try disconnecting the TCM and PCM and reconnect to see if it works. Check for contaminations at the connectors and clean if necessary.
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Friday, August 14th, 2015 AT 6:20 AM
Tiny
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  • 32 POSTS
Thanks again and I will try that.
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Friday, August 14th, 2015 AT 12:16 PM
Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
Good luck.
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Saturday, August 15th, 2015 AT 8:39 AM

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