GMC Yukon XL 2000–2006
Common on this vehicle:Loss of engine power, no accelerationStalls or shuts off
Possible causes
The documents say what to doOnly records name itThe size of a node, the width of a link and the numbers are records matching this search, not likelihoods.
FaultCrate・GMC Yukon XL 2000–2006・P0120, Engine
Candidate cause (the documents say what to do)
Reduced Engine Power from throttle body connector crimp, broken wire or grounds
A vehicle may come in for a reduced power message and DTCs P0120, P0220, P1516, P2101 or P2135.
The TAC / throttle body codes may be caused by a loose wiring crimp at the throttle body connector or a broken throttle body circuit.
How to tell
P0120P0220P1516P2101P2135Check engine / Service Engine SoonReduced Engine Power
What to do
- Inspect all related throttle body terminals for a loose wiring crimp.
- Wire breaks usually occur within 1 to 4 inches (= 25.4–101.6 mm) of the throttle body connector.
- On C/K trucks, complete SI procedures for voltage drop on grounds G103 and G104; grounds G103 or G104 may be loose or corroded.
- If a terminal crimp or broken wire is found, repair or replace only the circuits involved.
Caution: Installing this pigtail connector may cause other intermittent TAC module / TP codes at a later date.
What is needed
- Parts and materials
- Not stated
- Labor time
- Not stated
- Special tools
- Not stated
- Scan tool
- Not stated
Only what the technical documents state. "Not stated" does not mean not needed.
In the records
- Throttle Body: replaced 1（says it came back: 1）
- Throttle Body Harness: repaired 1（says it held for a while: 1）
- Throttle Body Harness: replaced 1（says it came back: 1）
Work that followed
- Throttle Body (replaced) did not settle it; then Throttle Body Harness (repaired) 1（says it held for a while: 1）record 1
The course as owners' complaints state it. A complaint is filed more often when a repair did not hold, so the counts are not a rate at which work succeeds.
Outside the documents and the records
The five pages read are two on the 2003 Tahoe and three on the 2003 Silverado; none is a record of the Yukon or Yukon XL. All are English Q&A threads, not a shop's records. The two Tahoe threads and the Car Talk thread on the Silverado 1500HD hold only questions and advice, with no repair outcome reported.
- In both 2003 Tahoe threads (2CarPros and Car Talk), a mechanic proposed replacing the throttle body together with a part on the accelerator pedal side (the accelerator pedal position sensor in the 2CarPros thread, the pedal in the Car Talk thread) while the cause had not been confirmed. 2CarProsCar Talk Community
- The owner of the 2003 Tahoe on Car Talk writes that the accelerator pedal sensor has already been replaced, so the owner takes it not to be the cause, and that the mechanics want to replace the throttle body and the pedal for $700. Car Talk Community
- The owner of the 2003 Tahoe (5.3L, P1516) on 2CarPros writes that the shop reproduced the fault with a scan tool and saw no disagreement in the throttle position sensor or TAC readings, that the shop said bypassing ground G103 by grounding at another point showed the ground was not the cause, and that at pickup the owner was told about $175 had gone into it with the fault still not fixed. 2CarPros
- In the 2CarPros thread on a 2003 Silverado 2500HD (6.0L, P1516), another poster with the same symptom (vehicle not stated) writes that two wires were broken 3/4 inch from the throttle body plug and that joining them with two butt connectors fixed it. 2CarPros
- The owner of another 2003 Silverado 2500HD (P1516) on 2CarPros writes that nothing wrong was found in the eight wires and terminals at the throttle body connector, and that after cleaning the throttle bore and clearing the code the fault had not come back as of that post. 2CarPros
The sentences above were written by FaultCrate from what shops' public pages and Q&A sites state as fact (none of the pages' wording is shown; a second reader checked each against its pages). A record of another vehicle says which vehicle. A Q&A thread is a question and advice, and may not say how the repair ended. The links below are places to look; the contents of pages not read were not checked.
The pages read, and other places to look (9)
Repair videos
- 2004 GMC YUKON P0120 P0220 P1516 REDUCED ENGINE POWER - DIAG AND EASY FIXYouTube, 2004 GMC Yukon, not read
Forums and Q&A
- What could be the source of my reduced engine power warning2CarPros, 2003 Chevrolet Tahoe 5.3L, 2012
- 2003 Chevy Tahoe Reduced Engine PowerCar Talk Community, 2003 Chevy Tahoe, 2014
- 2003 Chevrolet Silverado Reduced Power Mode2CarPros, 2003 Chevrolet 2500HD 6.0L, 2010
- 2003 Chevrolet Silverado Code P15162CarPros, 2003 Chevrolet Silverado 2500HD, 2009
- 2003 Chevy 1500HD 6.0L---P1516Car Talk Community, 2003 Chevy 1500HD 6.0L, 2014
- 2003 Yukon Reduced Engine Powertahoeyukonforum.com, 2003 Yukon, not read
- Reduced Engine Power write-uptahoeyukonforum.com, no vehicle stated, not read
- throttle body positiontahoeyukonforum.com, no vehicle stated, not read
See the evidence (1 technical documents, 1 records)
Passages of the technical documents
The bulletin covers 2003-2006 GMC Envoy, Savana, Sierra and Yukon.
2003-2006 GMC Envoy, Savana, Sierra, Yukon
General Motors (copy hosted by simple-engineering.com) 2006-10-31
It applies to vehicles with a 4.8, 5.3, 6.0 or 7.0 V-8 engine.
Equipped with a 4.8 5.3 6.0 or 7.0 V-8 Engine
General Motors (copy hosted by simple-engineering.com) 2006-10-31
A vehicle may come in for a reduced power message and DTCs P0120, P0220, P1516, P2101 or P2135.
A vehicle may be brought into the dealer for a reduced power message, and DTCs P0120, P0220, P1516, P2101, or P2135.
General Motors (copy hosted by simple-engineering.com) 2006-10-31
The TAC / throttle body codes may be caused by a loose wiring crimp at the throttle body connector or a broken throttle body circuit.
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.
General Motors (copy hosted by simple-engineering.com) 2006-10-31
Records
- Service engine light and reduced power mode episodes since November 2008 Owner complaint 2010-03-10
A cause or a result a complaint states is the owner’s view or what a dealer told them, not an established fact.
Put together by FaultCrate from public records and technical documents. The cause and the repair are for the workshop to decide with the vehicle in front of it. Counts are records, not failure rates.