code p 1781 - Chevy and GMC Duramax Diesel Forum

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post #1 of 20 (permalink) Old 03-13-2009, 09:57 PM Thread Starter
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code p 1781

hello everyone i get this code once and a while when scanned it says manufacturer control transmission im just wondering what it is ive done a search here and theres a few different answers anybody know whats the real problem thanks
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post #2 of 20 (permalink) Old 03-13-2009, 10:01 PM
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P1781
4X4 Switch Out of Self Test Range

08 LMM is alive and well again with a few add ons

2011 3500 Denali
2011 2500HD LTZ
2011 1500 LTZ
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post #3 of 20 (permalink) Old 03-13-2009, 10:05 PM Thread Starter
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ok what does that mean and how do i fix it any suggestions
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post #4 of 20 (permalink) Old 03-13-2009, 10:07 PM
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im looking to see what i can come up with for ya, one of tech specialists should be chime in here pretty quick

08 LMM is alive and well again with a few add ons

2011 3500 Denali
2011 2500HD LTZ
2011 1500 LTZ
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post #5 of 20 (permalink) Old 03-13-2009, 10:10 PM
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what the make and model of your truck and do you have anymods done to it?

08 LMM is alive and well again with a few add ons

2011 3500 Denali
2011 2500HD LTZ
2011 1500 LTZ
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post #6 of 20 (permalink) Old 03-13-2009, 10:14 PM Thread Starter
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2001 chevy lb7 not yet but have a banks 6gun kit in shed waiting on good weather to install
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post #7 of 20 (permalink) Old 03-13-2009, 10:29 PM
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are you getting a check engine light, if you are at one times, just when you turn the key on, runnin down the road, or did you just check to see if you had codes

08 LMM is alive and well again with a few add ons

2011 3500 Denali
2011 2500HD LTZ
2011 1500 LTZ
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post #8 of 20 (permalink) Old 03-13-2009, 10:37 PM Thread Starter
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every once and a while when it gets started the service engine soon light will come on and stay on sometimes for the rest of the day then when i run truck a few days later it wont be on other times i can start and shut of truck 50 times a day and its fine so i got it scanned a few times and thats the code ill get
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post #9 of 20 (permalink) Old 03-13-2009, 10:41 PM
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couple things to check, transfer case and front diff fluids, make sure no wires are bare or shorting together on either transfer case or front diff, just to eliminate the easy stuff first

08 LMM is alive and well again with a few add ons

2011 3500 Denali
2011 2500HD LTZ
2011 1500 LTZ
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post #10 of 20 (permalink) Old 03-13-2009, 10:43 PM
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I would also check the connectors at the ECM and TCM just to make sure they are secure and tight

Jim
__________________________________________________ _
2003 Chevy 2500hd crew cab 4x4, D/A

Just a few aftermarket goodies
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