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GMC Yukon 2000–2006

GMC YukonModel years 2000–2006

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Common on this vehicle:

issueElectronic transfer case stops shifting with no DTC (shift abuse lock out mode, normal)Remove

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Known issuesElectronic transfer case stops shifting with no DTC (shift abuse lock out mode, normal)1

  1. Manufacturer communication2000–2006 GMC YUKON DENALI ・ 2006-12-01

    Electronic transfer case stops shifting with no DTC: shift abuse lock out mode

    1. 1Fault

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

    2. 2Finding the cause

      Possible causes

      • 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.

    3. 3Correction

      Repair

      • Cycling the ignition off for 30 seconds or more should allow the transfer case to resume normal operation.
    Read the sentences of the record

    From the manufacturer’s document

    • 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.
    • Condition：The electronic transfer case may stop shifting and not set any DTCs.
    • Cause：This occurs if the transfer case control module senses repeated shift requests in a short period of time.
    • Cause：The transfer case control module software has a shift abuse lock out mode to protect the module and the encoder motor.
    • Cause：If the driver shifts into and out of different modes continuously, the module stops trying to shift for several seconds to prevent abuse damage.
    • Repair：Cycling the ignition off for 30 seconds or more should allow the transfer case to resume normal operation.

    Open this issue of GM TechLink ↗ The points above are read from an article of TechLink, GM’s monthly publication for dealership technicians. The article itself is not reproduced here.

    Remedy
    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.