After installing aftermarket stereo TCM is not communicating and I have code U0101

  • 2007 PONTIAC G6
  • 2.4L
  • 4 CYL
  • 2WD
  • 230,000 MILES
I just replaced my factory stereo with an aftermarket. I bought the adapter needed and recommended for my car specifically. All the plugs matched and the install seemed pretty simple. However, I am now getting no power to the stereo and now it seems that my TCM is not communicating. Error code U0101 is coming from the car. Shifting rough and steering is stiff. I have used a multi-meter and so far I am getting 12v from the constant and getting a reading of 4 from the ground. I am not getting a reading from the red 12v accessories wire coming from the factory harness. I can't find anything that says these issues are related but it all worked fine before hand. I have also checked all fuses with the multi-meter as well. Please help!
Tuesday, August 20th, 2019 AT 10:46 AM

1 Reply

  • 33,778 POSTS
Your Body Computer is built into the original radio. That is one of the many tricks GM pulls, in this case, to force you to have your radio repaired when it develops a problem. To verify this, pop the original radio back in to be sure everything works again. If it does, the aftermarket industry has come up with a "radio relocation kit" to make installing an aftermarket radio possible. You'll need to mount the original radio under a seat or in the trunk, and run the special wiring harness to it. You cut the speaker wires and run them to your new radio.
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Tuesday, August 20th, 2019 AT 4:13 PM

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