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Pete, Auto Service Technician
Category: Chevy
Satisfied Customers: 28247
Experience:  14 years GM dealer Technician.
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Codes P0120, P0220, P1516, P1125, P2135 I have already

Customer Question

Codes P0120, P0220, P1516, P1125, P2135
I have already replaced the APP Sensor.... truck won't turn over
Submitted: 1 year ago.
Category: Chevy
Expert:  Pete replied 1 year ago.

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.

Customer: replied 1 year ago.
The starter engages. Engine won't start and idle....P1125 is the main code that returns. But I replaced the pedal switch
Expert:  Pete replied 1 year ago.

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.

If more help is needed, use the reply tab to continue our conversation. If no further assistance is needed, kindly rate my service.You can rate at any time and we can continue to work on your question as this will not close out your question.Keep in mind in some cases it can be difficult to fully diagnose or help repair your vehicle without seeing it and I work on delivering the best possible answer from what I see to work with.

Thanks Pete

Customer: replied 1 year ago.
I have already checked the plugs on the TAC. No corrosion issues there....
Expert:  Pete replied 1 year ago.

O.k.,do you have a scan tool that will read the throttle data and a multi meter to test electrical with?

Customer: replied 1 year ago.
I have a code resder. That's it right now.....I can get a multi meter when my friend gets home.
Expert:  Pete replied 1 year ago.

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.

Thanks Pete