Calibration for Improved Transfer Case Operation in AWD Mode - kw 126 226 4WD AWD condition delay engage GMT305 GMT360 GMT370 NP4 NP8 operation performance program slip TCCM transfercase turn

When servicing the vehicle with the VIN you entered, the following diagnosis might be helpful if the vehicle exhibits the described symptoms.

Delayed transfer case engagement to the front wheels in AWD mode during a slip condition

1. Install the updated calibration listed as "New Calibration for Improved Transfer Case Operation in AWD Mode".
2. For 2002 Models order a TCCM through GMSPO and program with the above calibration.

Reminder: For transfer case related repairs, always check TIS2000 for updated calibrations.

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Please follow this diagnosis process thoroughly and complete each step. If the condition exhibited is resolved without completing every step, the remaining steps do not need to be performed. If these steps do not resolve the condition, please contact GM TAC for further diagnostic assistance. This diagnostic approach was developed for the vehicle with the VIN you entered and should not be automatically be used for other vehicles with similar symptoms.

(2004 Buick Ranier) and (2002 - 2004 Chevrolet Trailblazer 4WD) and (2002 - 2004 GMC Envoy 4WD) and (2004 GMC Envoy XUV 4WD) and (2002 - 2004 Oldsmobile Bravada)

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