Chevy tahoe 2003 . Code p1516.

[hperezlsvgs]

when i turn on my engine in the morning. Engine light turns on and it says reduce engine power.

 

[OR VietVet]

Welcome to the forum from Oregon

That code is directly, usually, related to the TPS. Throttle position Sensor.

https://www.rockauto.com/en/moreinfo.php?pk=1821916&cc=1412244&pt=5136&jsn=938 this one is "without traction control".

 

[hperezlsvgs]

I change the throttle body and the accelerator pedal sensor and still doing it
Need help to resolve issue

 

[OR VietVet]

There are diagnostic steps for that code. You can google them or what a lot of us do is join ALLDATAdiy.com for a year and get all the diagnostic help you need. We can make WAG's here without ever seeing the rig. Did you do any recent work on the rig? Check all grounds:

Fix the Chevrolet Intermittent Electrical Problem for Good

The Chevrolet intermittent electrical problem can drive you crazy. These vehicles intermittently lose power to the dashboard, radio and electrical system. See two causes.

www.fixmyoldride.com

 

[Joseph Garcia]

Welcome to the Forum from NH.

Lots of knowledgeable folks here who freely share their knowledge, experiences, and perspectives. Knowledge is power.

I hope that you will become a participating member in the Forum's discussions.

Pics of the truck, please.

You are already receiving suggestions, and other will chime in.

 

[PNWYukon]

I change the throttle body and the accelerator pedal sensor and still doing it
Need help to resolve issue

Condition/Concern:
A vehicle may have a reduced power message, and DTCs P0120, P0220, P1516, P2101, or P2135.

The Throttle Actuator Control (TAC) / throttle body type trouble codes, may be caused by a loose wiring crimp at the throttle body connector, or a broken throttle body circuit.

Recommendation/Instructions:

1. Inspect all related throttle body terminals for a loose wiring crimp. The loose crimp may be difficult to find, and the poor connection will be between the terminal and the copper strands of the wire. Wiggle test the individual throttle body circuits to see if the concern can be duplicated.
2. Inspect the related circuits for broken wires inside the insulation. The outer wire insulation may look fine, but the internal copper strands may be partially broken. Breaks in the wires usually occur within 1 to 4 inches of the throttle body connector. Wiggle testing may also induce a trouble code to set.
3. Check for voltage drop on grounds G103 and G104. Grounds G103 or G104 may be loose or corroded.

If a terminal crimp or a broken wire has been found, repair or replace only the circuits involved. There is a throttle body pigtail connector available through GMSPO, but installing this pigtail connector may cause other intermittent TAC module/TP codes at a later date. If this pigtail must be used, please follow the SI procedures for Splicing Copper Wire Using Splice Sleeves. (the proper Kent-Moore crimping tool must be used for this repair)

 

[OR VietVet]

May just need a simple throttle body cleaning and maybe even the MAP/MAF cleaning.