New LBZ owner powertrain question - Chevy and GMC Duramax Diesel Forum
06-07 LBZ & LLY Duramax Powertrain Discussion of components that are directly involved in the power production and all that is needed to get and keep the truck moving . Engine , Transmission, Etc.

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post #1 of 3 (permalink) Old 11-13-2019, 07:27 PM Thread Starter
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New LBZ owner powertrain question

Good evening everyone. I just started with my first GMC truck and I'm happy its a 2007 LBZ. Everything has went great until the latest cold snap. I pulled out to go to work and the transmission went into limp mode and showed a check brake system message as well as a check engine light. I ran my code reader and it told me all of my speed sensors are not sending a signal and I'm getting the P0700 TCS code. I'm wondering if I should start with the sensors since they seem like a known issue with these trucks or do I have something worse going on. The nearest dealer is about 80 miles away and the local shops don't deal with diesel trucks so I'm on my own. Thanks for any advice.
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post #2 of 3 (permalink) Old 11-13-2019, 09:45 PM
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Location: Prince George, BC
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Can you get access to a better code reader? P0700 is just the light to tell you theres an issue with the trans, there will be other code(s) specific to the trans that a better reader can get to. 1 sensor going I could see, but all of them? Sounds like it might be an issue with a ground possibly. Wouldnt hurt to check fuses as well. Im sure someone with a better idea will pipe up.

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post #3 of 3 (permalink) Old 11-14-2019, 08:53 PM Thread Starter
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I have the following codes from my tester. P0722, P0700, U1026, P0402, C0055, C0035, and C0040. I plan on checking the fuse's when we get a dry day. After that the only thing I know it could be is the ecm or the tcm.
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