i have 2008 6.7, sometimes when i'm towing, i loose power, ckeck engine lite comes on, throws code po2121, i have changed fuel pedal, batts, all cables and cable ends, still does it mainly when towing, but sometimes when not towing, any ideas? if i turn off key and then re-start, it will be ok

 

Probably the TPS, you should bench test it.

 

Check the turbo,it might be getting ready to puke.Just a thought............................

 

i cannot find anywhere to buy tps, nobody has a listing, can you help?-----2008 2500, 6.7

 

Is there one? I can find an accelerator pedal position sensor.... but, not the throttle position sensor......

 

where is the pedal position sensor located at?--- please help --desparate

 

On the pedal, I think......

 

i changed the pedal, still evrey now and then it will buck and surge---loosses about 50%power, lighting bolt lite comes on and throws codePO2121 [ throttle positioner sensor#1 ]------ all i have to do is shut it off, wait a minute, restart and it is good, been fighting this issue for a year