Source reference 10143757
Manufacturer communication — 2006 GMC YUKON DENALI
Relation to the target vehicle
- The source's vehicle field says Yukon; whether it is an XL is not stated.
- Model year
- Match 2006 — Source vehicle field
- Model
- Unknown YUKON DENALI — Source vehicle field
- Trim
- Match Denali — Source vehicle field
What the manufacturer’s document says
PIP3366C ・ normal characteristic (no repair) ・ names this vehicle
Applies to
The model list names GMC Yukon models, 1999 - 2019.
the passage
GMC Yukon Models 1999 - 2019
Fault
Light duty trucks with automatic transmission and 4 wheel drive may make a grinding/ratcheting noise when the transmission is shifted into park while the transfer case is in 4 wheel drive low (4LO) range.
the passage
Light Duty Trucks equipped with automatic transmissions and 4 wheel drive may exhibit a condition of a grinding/ratcheting type noise when shifting the automatic transmission into park while the transfer case is in 4 wheel drive low (4LO) range.
The grind/ratchet noise lasts approximately one second.
the passage
The grind/ratchet noise will last approximately one second.
Finding the cause
Possible causes
When the transmission is shifted from drive or reverse into park with the transfer case in 4LO, the driveline unloads and turns the propeller shaft approximately 1/8 of a turn.
the passage
When the automatic transmission is shifted from drive or reverse into park with the transfer case in 4LO the driveline unloads and turns the propeller shaft approximately 1/8 of turn.
The gear reduction in the transfer case makes the transmission output shaft turn faster than the parking pawl will hold, so the parking pawl grinds/ratchets until the output shaft stops.
the passage
The gear reduction in the transfer case causes the transmission output shaft to turn at a greater speed than the automatic transmission parking pawl will hold. This will result in the parking pawl to grind/ratchet until the output shaft comes to a stop.
Correction
Caution
This should be considered characteristic of 4 wheel drive vehicles operated in 4LO.
the passage
This condition should be considered characteristic of 4 wheel drive vehicles operated in 4LO.
Replacing transmission, transfer case and/or driveline components will not resolve the concern; shifting into park with the transfer case in the 4HI or 2HI range is recommended.
the passage
Replacing transmission, transfer case and or driveline components will not resolve the concern. It is recommended to shift into park while the transfer case is in the 4HI or 2HI range.
What is needed
- Parts and materials
- Not stated
- Labor time
- Not stated
- Special tools
- Not stated
- Scan tool
- Not stated
Only what the technical documents state. "Not stated" does not mean not needed.
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
本予備情報により、オートマチックトランスミッション搭載および4輪駆動の軽トラックは、トランスファーケースが4輪駆動ロー（4LO）レンジにある状態でオートマチックトランスミッションをパークにシフトする際に、グラインディング/ラチェット音がする症状を呈する可能性があることがディーラー技術者に通知されます。ディーラー技術者は、この症状を4WDロー走行の正常な特性と見なすべきことが助言されます。 Machine translation (unreviewed)
This Preliminary information communicates to the dealer technician thatLight Duty Trucks equipped with automatic transmissions and 4 wheel drive may exhibit a condition of grinding/ratcheting type noise when shifting the automatic transmission into park while the transfer case is in 4 wheel drive low (4LO) range. Dealers technician's are advised this condition should be deemed a normal characteristic of 4WD low operation.
Go to this passage in the original
Source
- Source
- NHTSA Manufacturer Communications
- Source reference
- 10143757
- Received by source
- 2018-08-20
- Incident date
- Unknown
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