Service engine soon ??

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Sekani's 96

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Guys my dad has an 2001 Tahoe I hooked up my obd2 computer to it an it gave me a po122 code which said

Throttle/pedal
Position sensor A
Circuit low input

What exactly is causing this code and what needs to be replaced to fix it
 

ATL

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it has something to do with your fly by wire throttle. start by cleaning the throttle body and check all the connections
 

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