P0120,P0220,P1516 codes Help??

[txarkitekt]

...and the codes are P0120, P0220, and P01516.

Ok, so you are getting:
P0120 TPS/pedal position sensor a circuit malfunction
P0220 TPS/pedal pos. sensor switch b circuit malfunction
P1516 Throttle Actuator Control aux input

Well, almost 100% of the time, if the TPS or Throttle Actuator gets messed up, it trips all 3 DTCs. As Nathan said, check the wiring. Here is a wiring diagram that might help: Wiring Diagram for TPS

In addition, look at this:

03 Reduced Engine Power - DTCs P0120 , P0220 , P1516 and/or P1518 - 03 Model Year Full Size Trucks and Utilities with 4.8 , 5.3 or 6.0 Engines - kw CEL light low LQ4 LQ9 LR4 MIL reducedpwrmde #PIP3042A - (Aug 30, 2004)

The following diagnosis might be helpful if the vehicle exhibits the symptom described in the PI.

Condition/Concern:

Service Engine Soon Light and / or Reduced Engine Power Mode due to any of the following DTCs: P0120, P0220, P1516 and/or P1518.

Recommendation/Instructions:

If the SI diagnosis and bulletin 03-06-04-032 did not isolate a concern, the following information may help:

1. Inspect the Yellow TAC Motor Control Circuit (581) about 1 inch to 4 inches from the throttle body connector to see if it is broken inside of the insulation.
2. Inspect S102 if there is a P1518 stored. S102 is in the engine harness and is 5.5 inches from the MAP Sensor.
3. Install that latest engine diagnostic calibrations in the PCM. Some 2003 model year vehicles have updated engine diagnostic calibrations available to address DTCs P0120, P0220, P1516 and or P1518. The title of the updated engine diagnostic calibration in TIS2000 is "New calibration to eliminate setting of P0120, P0220, or P1516 with the engine not running. Includes diagnostic enhancements for P1518."

If the above did not help, replace the throttle body and retorque it to 45 lb/in on the 1st pass and 89 lb/in on the second and final pass.

Maybe the wiring got bound up somehow. I would try to disconnect the battery at the negative terminal. Make sure to leave it off for at least 30 minutes. While you are waiting, disconnect the wiring from the TPS and TAC on the throttle body and wiggle the wires around carefully from the connector that plugs into the TB and work you way back about 5" up the wiring harness. Plug it all back in. After 30 minutes, connect negative terminal and restart truck. Did the DTCs go away? If not, head up to Autozone and have them read it. Tell them you replaced the TPS and TAC and just need to have the codes cleared (cause Autozone cannot legally clear them). Once the codes have cleared and if they come back, then either your Throttle Position Sensor or Throttle Actuator is bad.