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Does anybody know what a p1781 code means?? I have looked it up and it says engine torque signal circuit. Just by chance scanned the truck last night and low and behold. Thanks Jeremy
 

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P1781 indicates an incorrect voltage on the malfunction indicator lamp (MIL) circuit. The transmission control module (TCM) uses this circuit to request the engine control module (ECM) turn on the MIL because of a fault in the transmission. A poor electrical connection can cause this DTC to set.
 

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Discussion Starter #3
Thanks GMCSID. Guess i'll keep an eye on it and see if it comes back, then have to start checking connections. Later Jeremy
 

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GMCSID, Thanks for helping out in Eric's absence!!
 

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Yes GMCSID as in every day you answer technical questions , let it be know it is very much appreciated .....

The Staff .....

 

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Thanks for the kind words. I know Eric is overwhelmed, and I don't have all the Dmax experience he does but if I can help out I will.
 
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