Manufacturer communication — 2006 GMC YUKON

• Applies to 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

• Applies to engine RPO LFA, LY2, L20, LMG, LC9, LH6, LMF, LH8, LH9, L76, LS2, LY5, LY6, L92, L96, LZ1, L94 or L9H.

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  Equipped with Engine RPO LFA, LY2, L20, LMG, LC9, LH6, LMF, LH8, LH9, L76, LS2, LY5, LY6, L92, L96, LZ1, L94 or L9H

• 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 shows 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 difference between TP Sensor 1 and TP Sensor 2 exceeding a calibrated value for more than 2 seconds may cause this condition.

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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. With a scan tool, verify that DTC P2135 is set as Current or in History.

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   With a scan tool, verify that DTC P2135 is set as Current or in History.

2. If the 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.

3. 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 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.

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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. Tighten the throttle body fasteners to 10 Y (89 lb in (= 10.1 N·m)), as printed in the text.

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

3. 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.

4. 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 for this condition; follow the procedure in the document 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 this 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.

• Do not use any solvent that contains Methyl Ethyl Ketone (MEK); it may damage fuel system components.

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  Do not use any solvent that contains Methyl Ethyl Ketone (MEK). This solvent may damage fuel system components.

• Verify the battery voltage is more than 12 volts but less than 16 volts before proceeding with ECM reprogramming.

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  Verify the battery voltage is more than 12 volts but less than 16 volts before proceeding with ECM reprogramming.