P0220 code. Very confused!

[USMC Matt]

Hello, I have an 03 Silverado with a 4.8. It keeps going into limp mode with p0220 code. I've replaced the throttle body, tested and tightened wires and pins in the connector. After clearing the code, I have driven 15 miles on the fwy to test it with no problems. After parking and restarting after a minute or so, everything works as normal, but after sitting for 10 minutes, the light comes on and it shows the same code, without turning on the engine, but just turning the key to the on position. I'm at a loss. Any help would be greatly appreciated.

[rjgti]

most likely a broken wire behind the connecter. it will look ok but will be broken inside the insulation of the wire. use a multi meter to find it

[USMC Matt]

most likely a broken wire behind the connecter. it will look ok but will be broken inside the insulation of the wire. use a multi meter to find it

I had check all the wires already. Sorry, I forgot to mention that. There were no open circuits.

[rjgti]

ohm out the two tps sensers and check that the ecm provided gnd is present

[rjgti]

http://easyautodiagnostics.com/gm/4.8L-5.3L-6.0L/electronic-throttle-body-1

 

this will help ya

[USMC Matt]

Awesome. Thank you. Gonna give that a shot today.

[BG Canada]

I had error code PO 0220 and error code PO 0650 last week. I took the throttle body off the manifold and cleaned it twice, two different days, then reassembled. I had cleared all the codes before this clean job and I had disconnected the communication cable before this as well. I also sprayed electrical contact cleaner in the male and female junctions. 

Its worked great for two days. I reset the ECM for idle by using a 3 minute cold start then wait 60 seconds in the key off position, then ran 3 minutes. I did this three times this morning. The engine is running smoothly around 400 RPM. It was below 0 degrees Celsius this morning. All is well with idle today.

  I had also added a few ounces of Seafoam cleaner to the crankcase, to help quiet the old lifters. The truck has 290 K Kilometres on the 6.0 litre engine. Its running nice and smooth.

BG