Code U0107, shuts down with reduced power?

Tiny
BRENT STROCHER
  • MEMBER
  • 2005 CHEVROLET 1500
  • 5.3L
  • V8
  • 4WD
  • AUTOMATIC
  • 400,000 MILES
I've gone through all of the grounds, and even ran new grounds to throttle control module. The truck ran good for about 2 hours, then it shut down again. When it shuts down, it will not turn off with the key. New ignition parts. Turn the key off, open door and wait till it chokes out. The truck would run great after I cleared the code. Sometimes it would run for a few seconds and others it would go for 5 minutes, before the throttle would stop working. ECM has been reprogrammed. All I get for answers is to just change all electronic control modules. TCM and BCM are each 200 to reprogram, after purchase.
Thursday, July 27th, 2023 AT 12:52 PM

13 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 50,162 POSTS
I would start by checking the power and grounds to the PCM which this code is pointing to. Also, you can send the PCM in for testing because it sounds bad, the fact you can reset the system and it works for a while is a classic sign the PCM is bad.

The U0107 error code communication problem between the Engine Control Module (ECM) and the Transmission Control Module (TCM).

Here is how to change the PCM out, you can get a preprogrammed unit by searching Google or Ebay.
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Friday, July 28th, 2023 AT 11:49 AM
Tiny
BRENT STROCHER
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  • 9 POSTS
Thanks for your help. When I got the truck, it had all kinds of electrical issues, so I got a used ECM/PCM? And the guy reprogrammed both, so I have a spare I can put in the truck. Today, before I saw this post, I was going over the electrical connections and wires with a mechanical friend. We were in the truck, codes cleared, and I hit the ac compressor switch. That caused an immediate u0107 and reduced power. I cleared the codes, and it all ran good for a minute. I turned off the A/C, and the truck shut off again. It seems to be connected to the A/C compressor activating and shutting down. I am kind of leaning towards a bad BCM, because of the effect the A/C switch is having. I'll swap out the ECM and get back to you.
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Friday, July 28th, 2023 AT 5:13 PM
Tiny
BRENT STROCHER
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And just for reference, this is the B code engine. ECM and PCM, I believe are the same thing in this instance.
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Friday, July 28th, 2023 AT 5:20 PM
Tiny
BRENT STROCHER
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  • 9 POSTS
I tried my original ECM that has been reprogramed and passed the testing when it was done, and there is no change. I actually had to clear the code when I installed it, which seems strange to me. When I cleared it, it ran for a couple seconds, and the code appeared again. When I look it up it says lost communication with Throttle Actuator Control Module, not Transmission Control.
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Friday, July 28th, 2023 AT 8:03 PM
Tiny
KEN L
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  • 50,162 POSTS
Okay, we are getting closer I would replace the Throttle Actuator Control Module. Here it is for $78.00:

https://amzn.to/43Rzn4e

Here is a video to help with the replacement:

https://youtu.be/eI9aH1r_yc8

Check out the images (below). Please let us know what happens.

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Saturday, July 29th, 2023 AT 12:59 PM
Tiny
BRENT STROCHER
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  • 9 POSTS
I tried a different Throttle body, and it made no difference. That link is for a throttle body, not the Throttle actuator Module. I just got back from a auto salvage yard and grabbed a used TAC module. It has the same numbers on it so i'm going to try it with out programming.
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Saturday, July 29th, 2023 AT 5:30 PM
Tiny
BRENT STROCHER
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  • 9 POSTS
Straight in to reduced engine power and u0107 with different TAC module, not programmed.
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Saturday, July 29th, 2023 AT 8:53 PM
Tiny
KEN L
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It sounds like the PCM is bad, but here are the grounds and power inputs to be sure.

This guide can help:

https://www.2carpros.com/articles/how-to-check-wiring

Check out the images (below). Please let us know what happens.

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Monday, July 31st, 2023 AT 10:43 AM
Tiny
BRENT STROCHER
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The ECM is new-used. The original that was in the truck when I got it. It has been updated. The truck runs fine with the Heater controls unplugged. As soon as you plug in the main plug it can cause the u0107. Engaging the ac compressor will shut the engine down immediately. I drove around a bunch today and without that thing plugged in, it runs fine. Going through all of the compressors hook up to make sure it's good.
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Tuesday, August 1st, 2023 AT 6:30 PM
Tiny
KEN L
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I have seen the compressor clutch coil short out and cause problems, but it sounds like the HVAC controller is shorted out. Did you do a CAN scan? You can get a CAN scanner (Controller Area Network) which will work on most cars from Amazon.

here is a video to show you how:

https://youtu.be/u-4syLc-ifQ
=

Please go over these guides and get back to us.
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Wednesday, August 2nd, 2023 AT 6:52 PM
Tiny
BRENT STROCHER
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This is the scan tool I have.

https://www.amazon.ca/LAUNCH-Reader-Automotive-Diagnostic-Functions/dp/B07N6H7VH9/ref=sr_1_8?
crid=3KI66MP3DG9VB&keywords=CAN+scan+tool&qid=1691036384&sprefix=can+scan+tool+%2Caps%2C485&sr=8-8

It is listed as a CAN diagnostic scan tool. I don't know how to scan the CAN. The code reader link you listed as a can scanner, but I can't find any information online, as to how it does a scan. or how to start it. I read the manuals over and that particular function is not listed. I've got no problem buying a better scan tool as mine has paid for itself a thousand times over.
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Wednesday, August 2nd, 2023 AT 9:27 PM
Tiny
BRENT STROCHER
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And as soon as I can I'm going to check the A/C compressor for any shorts in the wiring.
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Wednesday, August 2nd, 2023 AT 9:28 PM
Tiny
KEN L
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Please do.
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Sunday, May 5th, 2024 AT 4:17 PM

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