Transmission and drivelineModel years 1999–2007Manufacturer
Electronic transfer case stops shifting with no DTC (shift abuse lock out mode, normal)
The article names 1999-2007 vehicles including GMC Yukon, Yukon Denali and Yukon XL with the RPO NR4, NP1 or NP8 transfer case.
FaultCrate・Electronic transfer case stops shifting with no DTC (shift abuse lock out mode, normal)
The electronic transfer case may stop shifting and not set any DTCs.
This occurs 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.
If the driver shifts into and out of different modes continuously, the module stops trying to shift for several seconds to prevent abuse damage.
What to do
- Cycling the ignition off for 30 seconds or more should allow the transfer case to resume normal operation.
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.
See the evidence (1 documents, 6 passages)
| Document | Publisher | Date |
|---|---|---|
| [1]GM TechLink, December 2006 ↗ | ManufacturerGeneral Motors | 2006-12-01 |
Applies toThe information applies to 1999-2007 vehicles including GMC Yukon, Yukon Denali and Yukon XL with RPO NR4, NP1 or NP8 transfer case.
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.— [1]
First signsThe electronic transfer case may stop shifting and not set any DTCs.
The electronic transfer case may stop shifting and not set any DTCs.— [1]
Why it happensThis occurs if the transfer case control module senses repeated shift requests in a short period of time.
This condition will occur if the transfer case control module senses repeated shift requests in a short period of time.— [1]
Why it happensThe transfer case control module software has a shift abuse lock out mode to protect the module and the encoder motor.
The software in the transfer case control module has a shift abuse lock out mode to protect the module and encoder motor.— [1]
Why it happensIf the driver shifts into and out of different modes continuously, the module stops trying to shift for several seconds to prevent abuse damage.
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.— [1]
RepairCycling the ignition off for 30 seconds or more should allow the transfer case to resume normal operation.
Cycling the ignition off for 30 seconds or more should allow the transfer case to resume normal operation.— [1]
Put together by FaultCrate from public records and technical documents. The cause and the repair are for the workshop to decide with the vehicle in front of it. Counts are records, not failure rates.
List the records (1 that can be opened)
Records whose recall number, document number or text matches. Each line says why it matched.
- Electronic transfer case stops shifting with no DTC: shift abuse lock out modeManufacturer communication 2006-12-01・document number matches