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Throttle body/pedal position sensor

Thread author duanelild
Start date Aug 25, 2024

duanelild

New member

Aug 25, 2024

Hi on my 09 4.6 sedan same code p0121. Throttle body/pedal position sensor. I have replaced the throttle body twice. One was a reman and the other I ordered from Korea OEM new. I've replaced the pedal with a new OEM . That helped for a day now it's back to jumping idle from 5 to 700 and sometimes from 500 to 1400 RPM. It will go into limp mode while driving and sometimes it will be perfectly fine. The code will shut off and run fine then bam back to rough idle and hard starts. I'm leaning towards a bad TCM but not quite sure. Anybody else have this problem. And yes Ive done the relearn

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