my 2008 gmc savana 3500 6 litre won"t start

Question

i changed the ignistion and it still wont start it has a p1682 and u0168 code does anyone have any ideas what they are

Answer 1

The fault code P1682 sets when the ignition voltage is different then other ignition voltage readings.This causes electrical problems in the vehicle and related electrical components.

In some cases this can be a fault of an internal electrical failure in the ECM (engine control module) causing the voltage to be to low.

The circuits would have to be tested with a dealer scan tool to see if the ECM is at fault.A faulty ignition switch can also cause this issue,however the ECM is usually the culprit.