Manufacturer communication — 2006 GMC YUKON DENALI XL

Fitment confirmedReporter type: ManufacturerELECTRICAL SYSTEMENGINE

Relation to the target vehicle

The source's vehicle field includes the trim.

Model year: Match 2006 — Source vehicle field
Model: Match YUKON DENALI XL — Source vehicle field
Trim: Match Denali — Source vehicle field

What the manufacturer’s document says

07-06-04-019F ・ fault and correction ・ for GM vehicles in general

Applies to

Applies to 2018 and prior GM passenger cars and light duty trucks.
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2018 and Prior GM Passenger Cars and Light Duty Trucks

Fault

The engine warning lamp comes on intermittently with a message or indicator showing Reduced Engine Power.
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Some customers may comment on an intermittent malfunction indicator lamp (MIL) being Illuminated with a message or an indicator that displays Reduced Engine Power.
DTC P2138 (Accelerator Pedal Position (APP) Sensor 1-2 Correlation) is set as current or in history.
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The technician may observe on a scan tool DTC P2138 – Accelerator Pedal Position (APP) Sensor 1-2 Correlation set as Current or in History.

Finding the cause

Possible causes

Water may have entered the instrument panel (IP) to body harness connector, which carries the APP sensor signals to the ECM/PCM.
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This condition may be caused by water intrusion into the instrument panel (IP) to body harness connector, which carries the APP sensor signals to the ECM/PCM.

Steps to confirm (in the document’s order)

Verify that no aftermarket equipment is electrically connected to the APP sensor signal or low reference circuits, or to any other ECM/PCM 5V reference or low reference circuit.
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Verify that aftermarket equipment is not electrically connected to any of the APP sensor signal or low reference circuits or to any other ECM/PCM 5V reference or low reference circuits.
Locate the IP to body harness connector, which may be in or around the left hand kick panel area or inside the IP.
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Locate the IP to body harness connector, which may be located in and around the left hand kick panel area or inside the IP.
Inspect for a water leak in the area, using a water hose if necessary to find the source.
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Inspect for a water leak in the area. If necessary use a water hose to determine the source of the leak.
Possible water leak points include the A-pillar seals, the sunroof drain lines (if equipped) and the windshield/cowl sealing.
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Some examples of potential water leaks are: A-pillar seals, sunroof drain lines (if equipped) and windshield/cowl sealing.
Inspect the terminals of the IP to body harness connector for corrosion and debris.
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Inspect the IP to body harness connector terminals for corrosion and debris.

Correction

Repair

If a water leak is found, repair it as necessary and verify that the repair is effective.
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If a water leak is observed, repair as necessary. Verify the effectiveness of the repair.
If corrosion or debris is found on the connector terminals, repair as necessary.
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If any corrosion and/or debris is observed, repair as necessary.

Caution

Aftermarket equipment can generate DTC P2138 and/or other DTCs.
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Aftermarket equipment can generate DTC P2138 and/or other DTCs.

Compiled by reading the full text of the document; each point stands on the passage shown. Check the document itself, linked below, before working on a vehicle.

Stated content

Communication summary
本テクニカルブレティンは、間欠的なマルファンクションインジケーターランプ(MIL)点灯およびエンジン出力低下表示ならびにDTC P2138設定の顧客症状を修正するためのIP to ボディーハーネスコネクター修理の修理情報を提供する。 Machine translation (unreviewed)
This technical bulletin provides repair information for repairing the IP to body harness connector to correct a customer concern for intermittent Malfunction Indicator Lamp (MIL) illuminated with Reduced Engine Power displayed and DTC P2138 set.
Go to this passage in the original

Source

Source: NHTSA Manufacturer Communications
Source reference: 10139090
Received by source: 2018-06-04
Incident date: Unknown

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