I get a trouble code P1781 which I've done some reaserch on and can only find "engine torque signal circuit out of range". I will get the SES light only after the truck is warm, has been sitting for a few minutes to half an hour and then started back up. I usually clear the code with my predator programmer and no more SES light. The problem is intermittent. Anyone else having this problem or know of a fix?


2001 crew cab dmax 4x4.

Sorry guys, I posted this in the wrong room, it should have been in the ask the techs room. I did get info however, I went to the dealer today and they pulled up a service bulletin to the P1781 that requires Duramax and the 8.1L gasoline engines with the Allison automatic transmission to get a calibration update for the ECM and costs $49. The cause is Transmission control module--incorrect voltage level on mil request circuit. If it is still under warranty then it is no cost.