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GMC Yukon 2000–2006

GMC YukonModel years 2000–2006

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2 conditions added

Common on this vehicle:Loss of engine power, no accelerationWarning light

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3 records state a cause or a remedy. Each record is shown as short labels in the order fault → finding the cause → correction. Press a label to narrow to the records that state it.

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Known issuesThrottle body carbon build-up: idle surge, reduced engine power, throttle DTCs (high mileage)1

  1. Manufacturer communication2006 GMC YUKON ・ 2018-01-16

    Engine Control System Update - Idle Surge and Power Mode Issues

    1. 1Fault

      • If enough carbon builds up, an idle surge, deceleration surge, tip-in hesitation, reduced engine power mode, and/or DTCs P0068, P0121, P1516, P2101, P2119 and/or P2176 may be experienced on high mileage vehicles.

    2. 2Finding the cause

      Possible causes

      • 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.

      Steps to confirm (in the document’s order)

      1. If SI diagnosis does not isolate the cause, inspect the throttle body bore and plate for obvious carbon build up.
      2. 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.

    3. 3Correction

      Repair

      1. If carbon is present, follow the Throttle Body Cleaning Procedure in SI to clean the throttle body.
      2. 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.
    Read the sentences of the record

    From the manufacturer’s document

    • Applies to：The model table lists the GMC Yukon, model years 2006 - 2018, all V8 engines.
    • Condition：If enough carbon builds up, an idle surge, deceleration surge, tip-in hesitation, reduced engine power mode, and/or DTCs P0068, P0121, P1516, P2101, P2119 and/or P2176 may be experienced on high mileage vehicles.
    • Cause：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.
    • Confirm：If SI diagnosis does not isolate the cause, inspect the throttle body bore and plate for obvious carbon build up.
    • Repair：If carbon is present, follow the Throttle Body Cleaning Procedure in SI to clean the throttle body.
    • Repair：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.
    • Caution：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.
    • Confirm：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.

    Open the manufacturer’s document (PDF) ↗ The points above were read from this document.

    Remedy
    This PI was superseded to update model years and add information concerning idle surge, reduced engine power mode, and/or DTCs P0068, P0121, P1516, P2101, P2119, and/or P2176 that may be experienced on high mileage vehicles. Please discard PIP4578.

ELECTRICAL SYSTEM1

  1. Manufacturer communication2005–2006 GMC YUKON DENALI ・ 2018-05-21(1 earlier editions of this document folded here)

    Throttle Position Sensor Cover Replacement

    1. 1Fault

      • The malfunction indicator lamp (MIL) is illuminated with a Reduced Engine Power message displayed.
      • A scan tool may show DTC P2135: Throttle Position (TP) Sensor 1-2 Correlation set as Current or in History.

    2. 2Finding the cause

      Possible causes

      • The condition may be caused by the difference between TP Sensor 1 and TP Sensor 2 exceeding a calibrated value for more than 2 seconds.

      Steps to confirm (in the document’s order)

      1. After installing the new cover, if the scan tool TP Sensor 1 and 2 Agree/Disagree parameter displays Disagree, replace the throttle body assembly.
      2. If DTC P1516, P2101 and/or P2176 are set, replace the throttle body.

    3. 3Correction

      Repair

      1. Clean the throttle body bore and throttle plate with a clean shop towel and GM Top Engine Cleaner, P/N 1052626 (in Canada, P/N 993026), or ACDelco Upper Engine and Fuel Injector Cleaner, P/N 88861803, or an equivalent product.
      2. Remove the old TP sensor cover from the throttle body: grasp the cover, carefully lift it up and separate it from the throttle body.
      3. Tighten the throttle body fasteners to 89 lb in (= 10.1 N·m) (the text prints the metric value as "10 Y").
      4. Reprogram the ECM using the Service Programming System (SPS) with the latest calibration available on TIS2WEB.
      5. Perform the Throttle Learn Reset Procedure.

      Part numbers printed in the document

      The numbers are as the document prints them. The name and the replacing number are what the pages of GMPartsGiant, a reseller of genuine parts and not GM, state. Aftermarket equivalents are not checked here (the links only search by number). Confirm the fit for the vehicle (VIN) before ordering.

      Parts

      • Part number 19259452, Throttle Position (TP) Sensor Cover, quantity 1.

      Part numbers printed in the document

      The numbers are as the document prints them. The name and the replacing number are what the pages of GMPartsGiant, a reseller of genuine parts and not GM, state. Aftermarket equivalents are not checked here (the links only search by number). Confirm the fit for the vehicle (VIN) before ordering.

      Caution

      • Do not replace the throttle body; follow the procedure in the bulletin instead.
      • If the throttle body is dropped at any time during the procedure, abort the procedure and replace it with a new throttle body assembly.
    Read the sentences of the record

    From the manufacturer’s document

    • Applies to：The Yukon entries are 2008-2011 GMC Canyon, Savana, Sierra, Sierra Denali and Yukon models (note: earlier Yukon model years are not listed).
    • Condition：The malfunction indicator lamp (MIL) is illuminated with a Reduced Engine Power message displayed.
    • Condition：A scan tool may show DTC P2135: Throttle Position (TP) Sensor 1-2 Correlation set as Current or in History.
    • Cause：The condition may be caused by the difference between TP Sensor 1 and TP Sensor 2 exceeding a calibrated value for more than 2 seconds.
    • Caution：Do not replace the throttle body; follow the procedure in the bulletin instead.
    • Repair：Clean the throttle body bore and throttle plate with a clean shop towel and GM Top Engine Cleaner, P/N 1052626 (in Canada, P/N 993026), or ACDelco Upper Engine and Fuel Injector Cleaner, P/N 88861803, or an equivalent product.
    • Repair：Remove the old TP sensor cover from the throttle body: grasp the cover, carefully lift it up and separate it from the throttle body.
    • Caution：If the throttle body is dropped at any time during the procedure, abort the procedure and replace it with a new throttle body assembly.
    • Confirm：After installing the new cover, if the scan tool TP Sensor 1 and 2 Agree/Disagree parameter displays Disagree, replace the throttle body assembly.
    • Confirm：If DTC P1516, P2101 and/or P2176 are set, replace the throttle body.
    • Repair：Tighten the throttle body fasteners to 89 lb in (= 10.1 N·m) (the text prints the metric value as "10 Y").
    • Repair：Reprogram the ECM using the Service Programming System (SPS) with the latest calibration available on TIS2WEB.
    • Repair：Perform the Throttle Learn Reset Procedure.
    • Parts：Part number 19259452, Throttle Position (TP) Sensor Cover, quantity 1.

    Open the manufacturer’s document (PDF) ↗ The points above were read from this document.

    Remedy
    This technical bulletin provides a procedure for replacing the throttle position sensor cover for concerns regarding a indicator lamp illuminated reduced power message displayed and DTC P2135 set.

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