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  1. 02-09 Vortec 4.2L I-6 Engine and Drivetrain
    I got the code P1221 a while back. I cleaned the TB and reset the PCM. I drove maybe 30 minutes. I rarely drive this more than 15 minutes at a time as it is not my daily driver. Things were good for a out 4 or 5 months. Then same code. I bought a new TB and replaced the old. Reset everything...
    p1221 throttle body throttle position sensor
  2. General
    I've been getting a service engine light along with a reduced engine power that will not alow the truck to accelerate. After a restart the service engine light will stay on but reduced engine power is not triggered and will allow me to continue to drive until triggered again. I went to autozone...
    p0128 p1221 res ses
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