Chevrolet Repair Questions? Ask a Mechanic for Answers ASAP
Hi my name is ***** ***** I will be happy to assist with this today.In some cases I may need more info to assist better.I apologize for any delay.
When you say the truck wont turn over is the starter not engaging to crank over and start the engine or is the starter engaging but the engine isnt starting?
I you clear out these fault codes then try and start the truck again which codes come back again right away?
Let me know so we can continue,thanks Pete.
O.k.,the first thing that needs done here is locate the throttle control module (TAC module) located on the firewall area on the drivers side near the brake booster.Disconnect the connections from it and see if there is any water or corrosion in the connections.If there is then the TAC module needs replaced and the terminals and wiring cleaned in the connections or replaced in the connections.If this is or was already checked and found o.k. let me know so we can continue from here.
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O.k.,do you have a scan tool that will read the throttle data and a multi meter to test electrical with?
I suspect since the pedal switch was already replaced and if you have no wiring faults at all this is the TAC control module at fault needing replaced.This communicates with the engine computer and if it has an internal electrical fault it can cause a no start like you see here.I will post the diagnostic procedures on how to test for the code P1125 and it needs to be followed to pinpoint the fault for repair here.I do suspect the TAC module needs replaced.This will however require a multi meter to test electrical with and a scan tool that can read the throttle data unfortunately.One other thing is to check and make sure no fuses are blown needing replaced.Unfortunately without this scan tool to do this this can make it difficult to fully pinpoint the cause here but I do suspect the TAC due to the common failure of it.
Let me know if you need anything else and feel free to rate my help.