Electrical, wiring and powerModel years 2003–2006Manufacturer
Reduced Engine Power from throttle body connector crimp, broken wire or grounds
4.8, 5.3, 6.0 or 7.0 V-8; 2003-2006 GMC Yukon and other listed models
FaultCrate・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.
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.
In the records
- Throttle Body: replaced 3（says it held for a while: 1, says it came back: 1, says it did not fix it: 1）
- Throttle Body Harness: replaced 3（says it came back: 1, says it did not fix it: 2）
- Throttle Position Sensor: replaced 3（says it did not fix it: 2, result not stated: 1）
- Acceleration Sensor: replaced 1（result not stated: 1）
Applies to
- The bulletin covers 2003-2006 GMC Envoy, Savana, Sierra and Yukon.
- It applies to vehicles with a 4.8, 5.3, 6.0 or 7.0 V-8 engine.
See the evidence (1 documents, 9 passages)
| Document | Publisher | Date |
|---|---|---|
| [1]#PIP3089B: SES Light And Reduced Engine Power DTC P0120 P0220 P1516 P2135 ↗ | ManufacturerGeneral Motors (copy hosted by simple-engineering.com) | 2006-10-31 |
Applies toThe bulletin covers 2003-2006 GMC Envoy, Savana, Sierra and Yukon.
2003-2006 GMC Envoy, Savana, Sierra, Yukon— [1] Models
Applies toIt 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— [1] Models
First signsA 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.— [1] Condition/Concern
Why it happensThe 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.— [1] Condition/Concern
How to confirmInspect all related throttle body terminals for a loose wiring crimp.
Inspect all related throttle body terminals for a loose wiring crimp.— [1] step 1
How to confirmWire breaks usually occur within 1 to 4 inches (= 25.4–101.6 mm) of the throttle body connector.
Breaks in the wires usually occur within 1 to 4 inches of the throttle body connector.— [1] step 2
How to confirmOn C/K trucks, complete SI procedures for voltage drop on grounds G103 and G104; grounds G103 or G104 may be loose or corroded.
On C/K trucks complete SI procedures for voltage drop on grounds G103 and G104. Grounds G103 or G104 may be loose or corroded.— [1] step 3
RepairIf a terminal crimp or broken wire is found, repair or replace only the circuits involved.
If a terminal crimp or a broken wire has been found, repair or replace only the circuits involved.— [1] Recommendation
CautionInstalling this pigtail connector may cause other intermittent TAC module / TP codes at a later date.
installing this pigtail connector may cause other intermittent TAC module/TP codes at a later date.— [1] Recommendation
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.
List the records (7 that can be opened)
Records whose recall number, document number or text matches. Each line says why it matched.
- Check engine codes returning repeatedly; reduced power modeOwner complaint 2020-07-27・tied by reading the record: “CODES P1516, P2135, AND P0120 HAVE RETURNED FOR A THIRD TIME. I WAS DRIVING AND MY CAR WENT INTO REDUCED POWER MODE. LUCKILY, I WAS JUST A MILE AWAY FROM HOME AND LIMPED MY CAR HOME. I'VE SINCE CLEANED THE MASS AIR FLOW SENSOR AND THROTTLE BODY. I'VE CHANGED OUT THE TPS AND ACCELERATION SENSOR. I'VE CHECKED ALL MY GROUNDS AND THESE CODES KEEP COMING BACK.”
- Check engine light and reduced power warning with complete loss of acceleration, braking and steeringOwner complaint 2015-09-28・tied by reading the record: “I HAVE ALREADY REPLACED THE THROTTLE HOUSING AND HARNESS COMPONENTS, ACCELERATION PEDAL SENSOR AND YET THE ISSUE CONTINUES”
- Reduced engine power display and accelerator lossOwner complaint 2015-09-15・tied by reading the record: “I REPLACED THE THROTTLE POSITION SENSOR AND THE HARNESS (BECAUSE I HEARD THE HARNESS MIGHT ALSO BE AN ISSUE) AND I AM STILL HAVING THE SAME PROBLEM WITH MY TRUCK.”
- Reduced engine power and service engine soon signals appearing repeatedly since September 2014Owner complaint 2015-02-23・tied by reading the record: “THROTTLE BODY SENSOR REPLACED TWICE, THROTTLE BODY HARNESS REPLACED, ALL WIRES, AND SENSORS HAVE BEEN CLEANED AND THOROUGHLY INSPECTED. REDUCED ENGINE POWER OCCURS WEEKLY EVEN AFTER BEING SERVICED.”
- Reduced power indicator comes on intermittently, vehicle limited to 30 MPHOwner complaint 2011-09-09・tied by reading the record: “HAVE HAD IT @ SEVERAL SHOPS & REPLACED THROTTLE SENSOR, TRACED WIRES, REPLACED GROUNDS, INSPECTED HARNESS BUT DOESN'T SEEM TO HELP.”
- Stalling and engine power reduced light; code P2135Owner complaint 2010-09-04・tied by reading the record: “NEW PROBLEM- ENGINE POWER REDUCED LIGHT..VEHICLE RUNS SLUGGISH..CODE CAME BACK P2135..THROTTLE BODY SENSOR ...REPLACED THROTTLE BODY ALSO REPLACED WIRE CONNECTOR...TRUCK RAN FINE FOR FEW MONTHS AND DID IT AGAIN...SAME CODEP2135”
- Service engine light and reduced power mode episodes since November 2008Owner complaint 2010-03-10・tied by reading the record: “AFTER THE THROTTLE BODY WAS REPLACED IN DEC 08, THE REDUCED ENGINE POWER DIDN'T COME BACK UNTIL APRIL 2009. DEALER THEN REWIRED THE HARNESS AND IT STOPPED UNTIL THE FALL OF 2009.”