EngineModel years 2006–2018Manufacturer
Throttle body carbon build-up: idle surge, reduced engine power, throttle DTCs (high mileage)
GMC Yukon 2006 - 2018, V8 (among many listed V8 models); of the 2000-2006 trucks only the 2006 model year is listed
FaultCrate・Throttle body carbon build-up: idle surge, reduced engine power, throttle DTCs (high mileage)
With enough carbon, idle surge, deceleration surge, tip-in hesitation, reduced engine power mode and/or DTCs may occur.
As carbon builds up in the throttle body of a high-mileage vehicle, the ECM/PCM learns to compensate by increasing the throttle plate angle.
How to tell
What to do
- If SI diagnosis does not isolate the cause, inspect the throttle body bore and plate for obvious carbon build-up.
- If carbon is present, follow the Throttle Body Cleaning Procedure in SI.
- Depending on the vehicle, the idle learn reset/reset idle learn is normally found on the Tech 2 ECM menu for Module Set Up or Special Functions/TAC System.
- After ensuring that the throttle body bore and plate are clean, perform an idle learn reset/reset idle learn with the Tech 2/GDS and re-evaluate the concern.
Caution
- If the throttle body is cleaned without performing an idle learn reset/reset idle learn with the Tech 2, the ECM/PCM may continue to compensate for the previous carbon build up, and the concern may return along with DTCs P0121, P0506 and/or P0507.
- If the ECM/PCM of a high mileage vehicle is replaced and/or reprogrammed without performing the Throttle/Idle Learn outlined in SI, it may no longer compensate for existing carbon build up in the throttle body.
Applies to
- The bulletin lists GMC Yukon 2006 - 2018.
See the evidence (2 documents, 9 passages)
| Document | Publisher | Date |
|---|---|---|
| [1]PIP4578B: SES Light, Idle Surge, and/or Reduced Engine Power Mode - Clean Throttle Body and Perform Idle Learn Reset ↗ | ManufacturerGeneral Motors (published by NHTSA) | 2017-12-18 |
| [2]PIP4578B SES Light, Idle Surge, and/or Reduced Engine Power Mode with DTCs P0068, P0121, P0506, P0507, P1516, P2101, P2119, and/or P2176 - Clean Throttle Body and Perform Idle Learn Reset ↗ | ManufacturerGeneral Motors | — |
Applies toThe bulletin lists GMC Yukon 2006 - 2018.
Yukon 2006 - 2018— [1] Models
Why it happensAs carbon builds up in the throttle body of a high-mileage vehicle, the ECM/PCM learns to compensate by increasing the throttle plate angle.
As carbon builds up in the throttle body of a high mileage vehicle, the ECM/PCM learns to compensate by increasing the throttle plate angle.— [1] Condition
First signsWith enough carbon, idle surge, deceleration surge, tip-in hesitation, reduced engine power mode and/or DTCs may occur.
If enough carbon builds up, an idle surge, deceleration surge, tip-in hesitation, reduced engine power mode, and/or DTCs— [1] Condition
How to confirmIf SI diagnosis does not isolate the cause, inspect the throttle body bore and plate for obvious carbon build-up.
If SI diagnosis does not isolate the cause of this concern, inspect the throttle body bore and plate for obvious carbon build up.— [1] Recommendations
RepairIf carbon is present, follow the Throttle Body Cleaning Procedure in SI.
If carbon is present, follow the Throttle Body Cleaning Procedure in SI to clean the throttle body.— [1] Recommendations
RepairDepending on the vehicle, the idle learn reset/reset idle learn is normally found on the Tech 2 ECM menu for Module Set Up or Special Functions/TAC System.
Notice: Depending on the vehicle you are working on, the 3idle learn reset/reset idle learn3 is normally found on the Tech 2 ECM menu for Module Set Up or Special Functions/TAC System.— [2]
RepairAfter ensuring that the throttle body bore and plate are clean, perform an idle learn reset/reset idle learn with the Tech 2/GDS and re-evaluate the concern.
After ensuring that the throttle body bore and plate are clean, perform an 3idle learn reset/reset idle learn3 with the Tech 2/GDS and re-evaluate the concern.— [2]
CautionIf the throttle body is cleaned without performing an idle learn reset/reset idle learn with the Tech 2, the ECM/PCM may continue to compensate for the previous carbon build up, and the concern may return along with DTCs P0121, P0506 and/or P0507.
If the throttle body is cleaned without performing an 3idle learn reset/reset idle learn3 with the Tech 2, the ECM/PCM may continue to compensate for previous carbon build up, causing it to return with a similar concern as well as DTCs P0121, P0506, and/or P0507.— [2]
CautionIf the ECM/PCM of a high mileage vehicle is replaced and/or reprogrammed without performing the Throttle/Idle Learn outlined in SI, it may no longer compensate for existing carbon build up in the throttle body.
if the ECM/PCM of a high mileage vehicle is replaced and/or reprogrammed without performing the Throttle/Idle Learn outlined in SI, the ECM/PCM may no longer compensate for existing carbon build up in the throttle body— [2]
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 (1 that can be opened)
Records whose recall number, document number or text matches. Each line says why it matched.
- Engine Control System Update - Idle Surge and Power Mode IssuesManufacturer communication 2018-01-16・document number matches