kal el

I have an 03 2500 hd but it is the exact same as on the 5.3s I also have an 03 1500 z71 with the 5.3. you are right the sensor is part of the throttle body , I know that is all I paid for it from the dealer. email me and i will send pics of the one I removed I do not know how to post pics in here.Also I dont know if it is available yet from aftermarket.

like I stated awhile ago I went through the tsb and had no bad or loose wires. I replaced the tps and found a small crack in the back that was allowing condensation get in and throwing off the signal or voltage to the sensor on the gas pedal, the didint agree so goes to limp mode. I bought the new tps from the dealer was about $160 and took about 10 minutes to put on. 3 dealers told me that you needed a tech 2 to sync it but it does not need to be synced. this might not be the problem but 3 dealers couldnt duplicate and none wanted to put the part on without it doing it, so I just did it myself and glad I did.

do a search for reduced engine power, I had the same problem on mine and there is a lengthy(sp) procedure to diagnose this. mine actually had a small hole in the tps and was letting moisture build up and throw off the electronics inside. the gas pedal has a sensor and the tps has a sensor and they have to be reading the same or you will go into reduced power mode. I went thru the whole thing and couldnt find the problem dealers didnt want to put a new tps on so I finally did it myself and havent had a problem with it since.