Manufacturer communication — 2006 GMC YUKON XL

Fitment confirmedReporter type: Manufacturer

Relation to the target vehicle

The trim is named in the text. A report may mention several vehicles, so check the quote.

Model year: Match 2006 — Source vehicle field
Model: Match YUKON XL — Source vehicle field
Trim: Match Denali — Stated in the text
…GMC Canyon, Envoy, Sierra, Yukon, Yukon Denali, Yukon XL, Jimmy, Sonoma, Suburban, Hum…

What the manufacturer’s document says

normal characteristic (no repair) ・ names this vehicle

Applies to

The information applies to 1999-2007 vehicles including GMC Yukon, Yukon Denali and Yukon XL with RPO NR4, NP1 or NP8 transfer case.
the passage
This information applies to 1999-2007 Cadillac Escalade, Chevrolet Avalanche, Trailblazer, Colorado, Blazer, S10, Silverado, Suburban, Tahoe, GMC Canyon, Envoy, Sierra, Yukon, Yukon Denali, Yukon XL, Jimmy, Sonoma, Suburban, Hummer H2 and H3 with RPO NR4, NP1, or NP8 Transfer Case.

Fault

The electronic transfer case may stop shifting and not set any DTCs.
the passage
The electronic transfer case may stop shifting and not set any DTCs.

Finding the cause

Possible causes

This occurs if the transfer case control module senses repeated shift requests in a short period of time.
the passage
This condition will occur if the transfer case control module senses repeated shift requests in a short period of time.
The transfer case control module software has a shift abuse lock out mode to protect the module and the encoder motor.
the passage
The software in the transfer case control module has a shift abuse lock out mode to protect the module and encoder motor.
If the driver shifts into and out of different modes continuously, the module stops trying to shift for several seconds to prevent abuse damage.
the passage
If the driver tries to shift into and out of different modes continuously, the transfer case control module will stop trying to shift for several seconds to prevent abuse damage to occur.

Correction

Repair

Cycling the ignition off for 30 seconds or more should allow the transfer case to resume normal operation.
the passage
Cycling the ignition off for 30 seconds or more should allow the transfer case to resume normal operation.

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
Japanese translation not processed yet.
Transfer Case Won’t Shift This information applies to 1999-2007 Cadillac Escalade, Chevrolet Avalanche, Trailblazer, Colorado, Blazer, S10, Silverado, Suburban, Tahoe, GMC Canyon, Envoy, Sierra, Yukon, Yukon Denali, Yukon XL, Jimmy, Sonoma, Suburban, Hummer H2 and H3 with RPO NR4, NP1, or NP8 Transfer Case. The electronic transfer case may stop shifting and not set any DTCs. This condition will occur if the transfer case control module senses repeated shift requests in a short period of time. The software in the transfer case control module has a shift abuse lock out mode to protect the module and encoder motor. If the driver tries to shift into and out of different modes continuously, the transfer case control module will stop trying to shift for several seconds to prevent abuse damage to occur. Cycling the ignition off for 30 seconds or more should allow the transfer case to resume normal operation.
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Source

Source: GM TechLink
Source reference: 2006-12-01
Received by source: 2006-12-01
Incident date: Unknown

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