Manufacturer communication — 2006 GMC YUKON

• The Yukon entries are 2008-2011 GMC Canyon, Savana, Sierra, Sierra Denali and Yukon models (note: earlier Yukon model years are not listed).

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  2008-2011 GMC Canyon, Savana, Sierra, Sierra Denali, Yukon Models

• The malfunction indicator lamp (MIL) is illuminated with a Reduced Engine Power message displayed.

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  Some customers may comment on an illuminated malfunction indicator lamp (MIL), 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.

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  The technician may observe on a scan tool DTC P2135: Throttle Position (TP) Sensor 1-2 Correlation set as Current or in History.

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.

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  This condition may be caused by the difference between the 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.

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   ⇒If 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.

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   ⇒If DTC P1516, P2101 and/or P2176 are set, replace the throttle body.

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.

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   Clean the throttle body bore and the throttle plate using a clean shop towel with 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.

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   Grasp the TP sensor cover and 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").

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   Tighten: Tighten the fasteners to 10 Y (89 lb in).

4. Reprogram the ECM using the Service Programming System (SPS) with the latest calibration available on TIS2WEB.

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   Reprogram the ECM using the Service Programming System (SPS) with the latest calibration available on TIS2WEB.

5. Perform the Throttle Learn Reset Procedure.

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   Perform the Throttle Learn Reset Procedure.

Parts

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

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  19259452 Throttle Position (TP) Sensor Cover 1

Caution

• Do not replace the throttle body; follow the procedure in the bulletin instead.

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  If a vehicle is encountered with this condition, DO NOT replace the throttle body. Instead follow this procedure below.

• If the throttle body is dropped at any time during the procedure, abort the procedure and replace it with a new throttle body assembly.

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  If at any time during this procedure the throttle body is dropped, abort this procedure and REPLACE it with a new throttle body assembly.