Dorman 599-105 Transfer Case Control Module
OE Quality 60-Day Returns
Dorman

Dorman 599-105 Transfer Case Control Module

Brand Dorman 599-105
Connector Color Orange
Package Contents Transfer Case Control Module
Terminal Type Pin
Fits Cadillac, Chevrolet, and GMC · 48 vehicles

Replacement module. Restores the original function and performance cost-effectively.

Same function. Matches the original module’s operation for a direct replacement.

Pin terminals. Orange connector for straightforward electrical connection.

Cross-references Cardone Reman 73-42104, 12577410 and TCCM10 for the same application. See all 4.

$455.03Free shipping
In stock · usually ships same day before 1pm CST
Step 1 — Confirm fitment
Free return shipping if it doesn't fit when you check fitment here first.
Select your vehicle to confirm fitment
Verify this part fits before purchasing — free returns if it doesn't
Step 2 — Quantity
Order total $455.03
Free shipping to the continental U.S.
Free returns within 60 days if it doesn't fit when fitment is verified.
Not what you need? See all Transfer Case Control Module options

Transfer Case Control Module Replacement

Restore transfer case operation with this Dorman transfer case control module. Part number 599-105 is a direct replacement for specific GM trucks and SUVs with push-button 4WD, helping return electronic transfer case control to normal function.

  • Replacement transfer case control module for vehicles with RPO code NP8
  • Orange connector color with pin terminal type
  • Matches the function and performance of the original module on listed applications
  • Fits select Cadillac, Chevrolet, and GMC 4WD models with 2-speed push-button shift transfer case
  • Package contents: transfer case control module

Detailed Product Overview

Dorman 599-105 is a transfer case control module built for specific GM applications where the original module is no longer controlling the transfer case correctly. It is used on 1999-2002 Chevrolet Silverado 1500, 1999-2002 GMC Sierra 1500, and related Cadillac Escalade and GMC Yukon applications equipped with RPO NP8. This module is a practical OE-style replacement for restoring electronic shift control in vehicles with a 2-speed push-button shift transfer case.

This part cross-references Cardone Reman 73-42104 for the same application.

Common Problems This Part Can Address

  • Inoperative push-button 4WD shift commands
  • Transfer case not responding to mode selection
  • Intermittent or failed electronic transfer case control
  • Loss of normal 2-speed transfer case operation on NP8-equipped vehicles
  • Faulty original module on GM trucks and SUVs

Installation Notes and Fitment

Compatible with 2002 Cadillac Escalade, 2002 Cadillac Escalade EXT, 2002 Chevrolet Avalanche 1500, 2002 Chevrolet Avalanche 2500, 1999-2002 Chevrolet Silverado 1500, 2001-2002 Chevrolet Silverado 1500 HD, 1999-2002 Chevrolet Silverado 2500, 2001-2002 Chevrolet Silverado 2500 HD, 2000-2002 Chevrolet Suburban 1500, 2000-2002 Chevrolet Suburban 2500, 2000-2002 Chevrolet Tahoe, 1999-2002 GMC Sierra 1500, 2001-2002 GMC Sierra 1500 HD, 1999-2002 GMC Sierra 2500, 2001-2002 GMC Sierra 2500 HD, 2000-2002 GMC Yukon, 2000-2002 GMC Yukon XL 1500, and 2000-2002 GMC Yukon XL 2500 with RPO code NP8.

Verify the vehicle’s RPO code NP8 and connector style before ordering. The orange connector and pin terminal layout should match the original module on the vehicle. Professional diagnosis of the transfer case system is recommended before replacement.

Quality Assurance

Dorman designs replacement electronic components to provide the same function and performance as the original part on the listed vehicles. Part number 599-105 is built for direct-fit service on confirmed NP8-equipped GM applications.

Related reading

This part fits 48 vehicles
Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.
YearMakeModelDrive TypeLitersCylindersPositionNotes
2002CadillacEscaladeAWD——N/AActive; w/RPO Code NP8 (2 Speed, Push Button Shift, Transfer Case)
2002CadillacEscalade EXTAWD——N/AFits vehicles with RPO Code NP8 for 2 Speed Push Button Shift Transfer Case.
2002ChevroletAvalanche 15004WD——N/AActive; w/RPO Code NP8 (2 Speed, Push Button Shift, Transfer Case)
2002ChevroletAvalanche 25004WD——N/AActive; w/RPO Code NP8 (2 Speed, Push Button Shift, Transfer Case)
2002ChevroletSilverado 15004WD——N/AActive; w/RPO Code NP8 (2 Speed, Push Button Shift, Transfer Case)
2002ChevroletSilverado 1500 HD4WD——N/AActive; w/RPO Code NP8 (2 Speed, Push Button Shift, Transfer Case)
2002ChevroletSilverado 25004WD——N/AActive; w/RPO Code NP8 (2 Speed, Push Button Shift, Transfer Case)
2002ChevroletSilverado 2500 HD4WD——N/AActive; w/RPO Code NP8 (2 Speed, Push Button Shift, Transfer Case)
2002ChevroletSuburban 15004WD——N/AActive; w/RPO Code NP8 (2 Speed, Push Button Shift, Transfer Case)
2002ChevroletSuburban 25004WD——N/AActive; w/RPO Code NP8 (2 Speed, Push Button Shift, Transfer Case)
2002ChevroletTahoe4WD——N/AActive; w/RPO Code NP8 (2 Speed, Push Button Shift, Transfer Case)
2002GMCSierra 15004WD——N/AActive; w/RPO Code NP8 (2 Speed, Push Button Shift, Transfer Case)
2002GMCSierra 1500 HD4WD——N/AActive; w/RPO Code NP8 (2 Speed, Push Button Shift, Transfer Case)
2002GMCSierra 25004WD——N/AActive; w/RPO Code NP8 (2 Speed, Push Button Shift, Transfer Case)
2002GMCSierra 2500 HD4WD——N/AActive; w/RPO Code NP8 (2 Speed, Push Button Shift, Transfer Case)
2002GMCYukon4WD——N/AActive; w/RPO Code NP8 (2 Speed, Push Button Shift, Transfer Case)
2002GMCYukon XL 15004WD——N/AActive; w/RPO Code NP8 (2 Speed, Push Button Shift, Transfer Case)
2002GMCYukon XL 25004WD——N/AActive; w/RPO Code NP8 (2 Speed, Push Button Shift, Transfer Case)
2001ChevroletSilverado 15004WD——N/AActive; w/RPO Code NP8 (2 Speed, Push Button Shift, Transfer Case)
2001ChevroletSilverado 1500 HD4WD——N/AActive; w/RPO Code NP8 (2 Speed, Push Button Shift, Transfer Case)
2001ChevroletSilverado 25004WD——N/AActive; w/RPO Code NP8 (2 Speed, Push Button Shift, Transfer Case)
2001ChevroletSilverado 2500 HD4WD——N/AActive; w/RPO Code NP8 (2 Speed, Push Button Shift, Transfer Case)
2001ChevroletSuburban 15004WD——N/AActive; w/RPO Code NP8 (2 Speed, Push Button Shift, Transfer Case)
2001ChevroletSuburban 25004WD——N/AActive; w/RPO Code NP8 (2 Speed, Push Button Shift, Transfer Case)
2001ChevroletTahoe4WD——N/AActive; w/RPO Code NP8 (2 Speed, Push Button Shift, Transfer Case)
2001GMCSierra 15004WD——N/AActive; w/RPO Code NP8 (2 Speed, Push Button Shift, Transfer Case)
2001GMCSierra 1500 HD4WD——N/AActive; w/RPO Code NP8 (2 Speed, Push Button Shift, Transfer Case)
2001GMCSierra 25004WD——N/AActive; w/RPO Code NP8 (2 Speed, Push Button Shift, Transfer Case)
2001GMCSierra 2500 HD4WD——N/AActive; w/RPO Code NP8 (2 Speed, Push Button Shift, Transfer Case)
2001GMCYukon4WD——N/AActive; w/RPO Code NP8 (2 Speed, Push Button Shift, Transfer Case)
2001GMCYukon XL 15004WD——N/AActive; w/RPO Code NP8 (2 Speed, Push Button Shift, Transfer Case)
2001GMCYukon XL 25004WD——N/AActive; w/RPO Code NP8 (2 Speed, Push Button Shift, Transfer Case)
2000ChevroletSilverado 15004WD——N/AActive; w/RPO Code NP8 (2 Speed, Push Button Shift, Transfer Case)
2000ChevroletSilverado 25004WD——N/AActive; w/RPO Code NP8 (2 Speed, Push Button Shift, Transfer Case)
2000ChevroletSuburban 15004WD——N/AActive; w/RPO Code NP8 (2 Speed, Push Button Shift, Transfer Case)
2000ChevroletSuburban 25004WD——N/AActive; w/RPO Code NP8 (2 Speed, Push Button Shift, Transfer Case)
2000ChevroletTahoe4WD5.3LV8N/AActive; w/RPO Code NP8 (2 Speed, Push Button Shift, Transfer Case)
2000ChevroletTahoe4WD4.8LV8N/AActive; w/RPO Code NP8 (2 Speed, Push Button Shift, Transfer Case)
2000GMCSierra 15004WD——N/AActive; w/RPO Code NP8 (2 Speed, Push Button Shift, Transfer Case)
2000GMCSierra 25004WD——N/AActive; w/RPO Code NP8 (2 Speed, Push Button Shift, Transfer Case)
2000GMCYukon4WD5.3LV8N/AActive; w/RPO Code NP8 (2 Speed, Push Button Shift, Transfer Case)
2000GMCYukon4WD4.8LV8N/AActive; w/RPO Code NP8 (2 Speed, Push Button Shift, Transfer Case)
2000GMCYukon XL 15004WD——N/AActive; w/RPO Code NP8 (2 Speed, Push Button Shift, Transfer Case)
2000GMCYukon XL 25004WD——N/AActive; w/RPO Code NP8 (2 Speed, Push Button Shift, Transfer Case)
1999ChevroletSilverado 15004WD——N/AActive; w/RPO Code NP8 (2 Speed, Push Button Shift, Transfer Case)
1999ChevroletSilverado 25004WD——N/AActive; w/RPO Code NP8 (2 Speed, Push Button Shift, Transfer Case)
1999GMCSierra 15004WD——N/AActive; w/RPO Code NP8 (2 Speed, Push Button Shift, Transfer Case)
1999GMCSierra 25004WD——N/AActive; w/RPO Code NP8 (2 Speed, Push Button Shift, Transfer Case)
Directly replaces or cross-references 4 part numbers
Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.
Cardone Reman — 73-4210412577410TCCM10TCCM10M