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

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

Applies to

Applies to 2020 and prior GM passenger cars and trucks equipped with an automatic transmission.
the passage
2020 and Prior GM Passenger Cars and Trucks (including Chevrolet Medium Duty LCF) Equipped with Automatic Transmission

Fault

Water or ethylene glycol in the ATF changes clutch friction and often causes shudder during engagement or gear changes, especially during torque converter clutch engagement.
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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)

One indication of water is ATF blowing out of the transmission vent tube.
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ATF blowing out of the transmission vent tube.
The ATF may look cloudy or, with extreme contamination, 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 look swollen or wrinkled 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 the water source is unknown or a leaking in-radiator oil cooler is suspected, test the ATF with the Gly-Tek kit from the Nelco Company to decide whether the radiator must be replaced.
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The “Gly-Tek” test kit, available from the Nelco Company, should be obtained and the ATF tested to make an accurate decision on the need for radiator replacement.

Correction

Repair

If water or coolant is found in the transmission, all rubber-type seals must be replaced.
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Replace all of the rubber-type seals.
Replace all 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.
Flush and flow check the transmission oil cooler using J 45096.
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Flush and flow check the transmission oil cooler using J 45096.
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
本ブレティンは、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します。 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: 10161968
Received by source: 2019-07-01
Incident date: Unknown

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