Manufacturer communication — 2006 GMC YUKON DENALI XL

Fitment confirmedReporter type: ManufacturerPOWER TRAIN

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

08-07-30-035G ・ fault and correction ・ for GM vehicles in general

Applies to

Applies to 2024 and prior GM passenger cars and trucks.
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2024 and Prior GM Passenger Cars and Trucks

Fault

Water or ethylene glycol in ATF changes the friction of the clutches, frequently causing shudder during engagement or gear changes, especially during torque converter clutch engagement.
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Water or ethylene glycol in ATF will also change the friction of the clutches, frequently resulting in shudder during engagement or gear changes, especially during torque converter clutch engagement.

Finding the cause

Steps to confirm (in the document’s order)

ATF blowing out of the transmission vent tube is an indication of water in the ATF.
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Indications of water in the ATF may include: • ATF blowing out of the transmission vent tube.
The ATF may appear cloudy or, with extreme contamination, look like a strawberry milkshake.
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ATF may appear cloudy or, in cases of extreme contamination, have the appearance of a strawberry milkshake.
Spacer plate gaskets may appear swollen or wrinkled in areas where they are not compressed.
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Spacer plate gaskets that appear to be swollen or wrinkled in areas where they are not compressed.
If water is found and its entry point is not identified, or a leaking in-radiator transmission oil cooler is suspected, a quick test kit that detects ethylene glycol in ATF is available.
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If water in the ATF has been found and the source of the water entry has not been identified, or if a leaking in-radiator transmission oil cooler is suspected (with no evidence of cross-contamination in the coolant recovery reservoir), a simple and quick test kit is available that detects the presence of ethylene glycol in ATF.

Correction

Repair

If water or coolant is found in the transmission, replace all of the rubber-type seals.
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Important: If water or coolant is found in the transmission, the following components MUST be replaced. • Replace all of the rubber-type seals.
Replace all of the composition-faced clutch plates and/or bands.
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Replace all of the composition-faced clutch plates and/or bands.
Replace all of the nylon parts.
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Replace all of the nylon parts.
Replace the torque converter.
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Replace the torque converter.
Thoroughly clean and rebuild the transmission, using new gaskets and oil filter.
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Thoroughly clean and rebuild the transmission, using new gaskets and oil filter.
Thoroughly inspect the engine cooling system and hoses and clean or repair as necessary.
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Thoroughly inspect the engine cooling system and hoses and clean/repair as necessary.

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
本通知はトランスミッションフルード内の水またはエチレングリコールの有害な影響に関する情報を提供するものです。 Machine translation (unreviewed)
This bulletin provides information on the harmful effects of water or ethylene glycol in transmission fluid.
Go to this passage in the original

Source

Source: NHTSA Manufacturer Communications
Source reference: 10234619
Received by source: 2023-04-22
Incident date: Unknown

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