Manufacturer communication — 2006 GMC YUKON

• The model table lists the GMC Yukon, model years 2006 - 2018, all V8 engines.

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  GMC Yukon 2006 - 2018 All All V8 All All

• 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.

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  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.

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.

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  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.

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   If SI diagnosis does not isolate the cause of this concern, 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.

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   is normally found on the Tech 2 ECM menu for Module Set Up or Special Functions/TAC System.

Repair

1. If carbon is present, follow the Throttle Body Cleaning Procedure in SI to clean the throttle body.

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   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.

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   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.

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.

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  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.

• 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.

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  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