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DormanPart #: 599-111
Dorman 599-111 Transfer Case Control Module
73 vehicles fit this part
Select your vehicle to confirm fitment
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OE Direct Replacement — Bolt-on fit, no modifications needed
Fitment: Chevrolet and GMC, Silverado 1500 Classic, Silverado 1500 HD Classic, Silverado 2500 HD Classic, Sierra 1500 Classic, Sierra 1500 HD Classic, Sierra 2500 HD Classic, Sierra 3500 Classic, Avalanche 1500, Avalanche 2500, Silverado 1500, Silverado 1500 HD, Silverado 2500 HD, Silverado 3500, Suburban 1500, Suburban 2500, Tahoe, Sierra 1500, Sierra 1500 HD, Sierra 2500 HD, Sierra 3500, Yukon, Yukon XL 1500, Yukon XL 2500, Silverado 2500, and Sierra 2500
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Not what you need? See all Transfer Case Control Module options
Transfer Case Control Module for NP1 Systems
Restore electronic transfer case operation with this Dorman transfer case control module. Built as a cost-effective replacement for the original unit, it delivers the same function and performance on specific vehicles with the NP1 2-speed electronic shift transfer case and three-button selection switch.
- Direct replacement transfer case control module for electronic shift systems
- Black connector color with pin terminal type
- Designed for vehicles equipped with RPO Code NP1 and a three-button selection switch
- Replacement for OE part number 12590219
- Fits select Chevrolet Silverado, Tahoe, Suburban, Avalanche, and GMC Sierra, Yukon applications
- Dorman part number 599-111
Detailed Product Overview
Dorman 599-111 is a transfer case control module engineered to restore proper electronic 4WD transfer case operation on select Chevrolet and GMC trucks and SUVs. It is intended for vehicles with the NP1 2-speed electronic shift transfer case and three-button selector, including applications such as 2003-2006 Chevrolet Silverado 1500, 2003-2006 GMC Sierra 2500 HD, and 2003-2006 Chevrolet Tahoe. This module is a practical OE-style replacement when the original control unit is no longer functioning correctly.
This part cross-references OE part number 12590219 for the same application.
Common Problems This Module Can Address
- Inoperative or inconsistent transfer case shift commands
- Loss of electronic 4WD mode selection
- Transfer case control module failure on NP1-equipped vehicles
- Intermittent response from the three-button shift switch
- Restoring normal transfer case communication on select Chevrolet Silverado and GMC Sierra models
Installation Notes and Fitment Tips
Verify the vehicle has RPO Code NP1, a 2-speed electronic shift transfer case, and a three-button selection switch before ordering. Confirm connector style and terminal type match the original module. Fits 2003-2006 Chevrolet Silverado 1500, N/A; Fits 2003-2006 Chevrolet Silverado 2500 HD, N/A; Fits 2003-2006 GMC Sierra 1500, N/A; Fits 2003-2006 GMC Yukon, N/A; Fits 2007 Chevrolet Silverado 1500 Classic, N/A; Fits 2007 GMC Sierra 3500 Classic, N/A.
Quality Assurance
Dorman replacement electronics are built to match the function of the original part on listed applications. This module is intended for direct-fit service on confirmed NP1-equipped Chevrolet and GMC vehicles.
| Brand | Dorman |
|---|---|
| Part Number | 599-111 |
| Connector Color | Black |
| Package Contents | Transfer Case Control Module |
| Terminal Type | Pin |
This part fits 73 vehicles. Search below:
| Year | Make | Model | Drive Type | Position | Notes |
|---|---|---|---|---|---|
| 2007 | Chevrolet | Silverado 1500 Classic | 4WD | N/A | w/RPO Code NP1 (2 Speed, Electronic Shift, Transfer Case); Three Button Selection Switch |
| 2007 | Chevrolet | Silverado 1500 HD Classic | 4WD | N/A | w/RPO Code NP1 (2 Speed, Electronic Shift, Transfer Case); Three Button Selection Switch |
| 2007 | Chevrolet | Silverado 2500 HD Classic | 4WD | N/A | w/RPO Code NP1 (2 Speed, Electronic Shift, Transfer Case); Three Button Selection Switch |
| 2007 | GMC | Sierra 1500 Classic | 4WD | N/A | w/RPO Code NP1 (2 Speed, Electronic Shift, Transfer Case); Three Button Selection Switch |
| 2007 | GMC | Sierra 1500 HD Classic | 4WD | N/A | w/RPO Code NP1 (2 Speed, Electronic Shift, Transfer Case); Three Button Selection Switch |
| 2007 | GMC | Sierra 2500 HD Classic | 4WD | N/A | w/RPO Code NP1 (2 Speed, Electronic Shift, Transfer Case); Three Button Selection Switch |
| 2007 | GMC | Sierra 3500 Classic | 4WD | N/A | w/RPO Code NP1 (2 Speed, Electronic Shift, Transfer Case); Three Button Selection Switch |
| 2006 | Chevrolet | Avalanche 1500 | 4WD | N/A | w/RPO Code NP1 (2 Speed, Electronic Shift, Transfer Case); Three Button Selection Switch |
| 2006 | Chevrolet | Avalanche 2500 | 4WD | N/A | w/RPO Code NP1 (2 Speed, Electronic Shift, Transfer Case); Three Button Selection Switch |
| 2006 | Chevrolet | Silverado 1500 | 4WD | N/A | w/RPO Code NP1 (2 Speed, Electronic Shift, Transfer Case); Three Button Selection Switch |
| 2006 | Chevrolet | Silverado 1500 HD | 4WD | N/A | w/RPO Code NP1 (2 Speed, Electronic Shift, Transfer Case); Three Button Selection Switch |
| 2006 | Chevrolet | Silverado 2500 HD | 4WD | N/A | w/RPO Code NP1 (2 Speed, Electronic Shift, Transfer Case); Three Button Selection Switch |
| 2006 | Chevrolet | Silverado 3500 | 4WD | N/A | w/RPO Code NP1 (2 Speed, Electronic Shift, Transfer Case); Three Button Selection Switch |
| 2006 | Chevrolet | Suburban 1500 | 4WD | N/A | w/RPO Code NP1 (2 Speed, Electronic Shift, Transfer Case); Three Button Selection Switch |
| 2006 | Chevrolet | Suburban 2500 | 4WD | N/A | w/RPO Code NP1 (2 Speed, Electronic Shift, Transfer Case); Three Button Selection Switch |
| 2006 | Chevrolet | Tahoe | 4WD | N/A | w/RPO Code NP1 (2 Speed, Electronic Shift, Transfer Case); Three Button Selection Switch |
| 2006 | GMC | Sierra 1500 | 4WD | N/A | w/RPO Code NP1 (2 Speed, Electronic Shift, Transfer Case); Three Button Selection Switch |
| 2006 | GMC | Sierra 1500 HD | 4WD | N/A | w/RPO Code NP1 (2 Speed, Electronic Shift, Transfer Case); Three Button Selection Switch |
| 2006 | GMC | Sierra 2500 HD | 4WD | N/A | w/RPO Code NP1 (2 Speed, Electronic Shift, Transfer Case); Three Button Selection Switch |
| 2006 | GMC | Sierra 3500 | 4WD | N/A | w/RPO Code NP1 (2 Speed, Electronic Shift, Transfer Case); Three Button Selection Switch |
| 2006 | GMC | Yukon | 4WD | N/A | w/RPO Code NP1 (2 Speed, Electronic Shift, Transfer Case); Three Button Selection Switch |
| 2006 | GMC | Yukon XL 1500 | 4WD | N/A | w/RPO Code NP1 (2 Speed, Electronic Shift, Transfer Case); Three Button Selection Switch |
| 2006 | GMC | Yukon XL 2500 | 4WD | N/A | w/RPO Code NP1 (2 Speed, Electronic Shift, Transfer Case); Three Button Selection Switch |
| 2005 | Chevrolet | Avalanche 1500 | 4WD | N/A | w/RPO Code NP1 (2 Speed, Electronic Shift, Transfer Case); Three Button Selection Switch |
| 2005 | Chevrolet | Avalanche 2500 | 4WD | N/A | w/RPO Code NP1 (2 Speed, Electronic Shift, Transfer Case); Three Button Selection Switch |
| 2005 | Chevrolet | Silverado 1500 | 4WD | N/A | w/RPO Code NP1 (2 Speed, Electronic Shift, Transfer Case); Three Button Selection Switch |
| 2005 | Chevrolet | Silverado 1500 HD | 4WD | N/A | w/RPO Code NP1 (2 Speed, Electronic Shift, Transfer Case); Three Button Selection Switch |
| 2005 | Chevrolet | Silverado 2500 HD | 4WD | N/A | w/RPO Code NP1 (2 Speed, Electronic Shift, Transfer Case); Three Button Selection Switch |
| 2005 | Chevrolet | Silverado 3500 | 4WD | N/A | w/RPO Code NP1 (2 Speed, Electronic Shift, Transfer Case); Three Button Selection Switch |
| 2005 | Chevrolet | Suburban 1500 | 4WD | N/A | w/RPO Code NP1 (2 Speed, Electronic Shift, Transfer Case); Three Button Selection Switch |
| 2005 | Chevrolet | Suburban 2500 | 4WD | N/A | w/RPO Code NP1 (2 Speed, Electronic Shift, Transfer Case); Three Button Selection Switch |
| 2005 | Chevrolet | Tahoe | 4WD | N/A | w/RPO Code NP1 (2 Speed, Electronic Shift, Transfer Case); Three Button Selection Switch |
| 2005 | GMC | Sierra 1500 | 4WD | N/A | w/RPO Code NP1 (2 Speed, Electronic Shift, Transfer Case); Three Button Selection Switch |
| 2005 | GMC | Sierra 1500 HD | 4WD | N/A | w/RPO Code NP1 (2 Speed, Electronic Shift, Transfer Case); Three Button Selection Switch |
| 2005 | GMC | Sierra 2500 HD | 4WD | N/A | w/RPO Code NP1 (2 Speed, Electronic Shift, Transfer Case); Three Button Selection Switch |
| 2005 | GMC | Sierra 3500 | 4WD | N/A | w/RPO Code NP1 (2 Speed, Electronic Shift, Transfer Case); Three Button Selection Switch |
| 2005 | GMC | Yukon | 4WD | N/A | w/RPO Code NP1 (2 Speed, Electronic Shift, Transfer Case); Three Button Selection Switch |
| 2005 | GMC | Yukon XL 1500 | 4WD | N/A | w/RPO Code NP1 (2 Speed, Electronic Shift, Transfer Case); Three Button Selection Switch |
| 2005 | GMC | Yukon XL 2500 | 4WD | N/A | w/RPO Code NP1 (2 Speed, Electronic Shift, Transfer Case); Three Button Selection Switch |
| 2004 | Chevrolet | Avalanche 1500 | 4WD | N/A | w/RPO Code NP1 (2 Speed, Electronic Shift, Transfer Case); Three Button Selection Switch |
| 2004 | Chevrolet | Avalanche 2500 | 4WD | N/A | w/RPO Code NP1 (2 Speed, Electronic Shift, Transfer Case); Three Button Selection Switch |
| 2004 | Chevrolet | Silverado 1500 | 4WD | N/A | w/RPO Code NP1 (2 Speed, Electronic Shift, Transfer Case); Three Button Selection Switch |
| 2004 | Chevrolet | Silverado 2500 | 4WD | N/A | w/RPO Code NP1 (2 Speed, Electronic Shift, Transfer Case); Three Button Selection Switch |
| 2004 | Chevrolet | Silverado 2500 HD | 4WD | N/A | w/RPO Code NP1 (2 Speed, Electronic Shift, Transfer Case); Three Button Selection Switch |
| 2004 | Chevrolet | Silverado 3500 | 4WD | N/A | w/RPO Code NP1 (2 Speed, Electronic Shift, Transfer Case); Three Button Selection Switch |
| 2004 | Chevrolet | Suburban 1500 | 4WD | N/A | w/RPO Code NP1 (2 Speed, Electronic Shift, Transfer Case); Three Button Selection Switch |
| 2004 | Chevrolet | Suburban 2500 | 4WD | N/A | w/RPO Code NP1 (2 Speed, Electronic Shift, Transfer Case); Three Button Selection Switch |
| 2004 | Chevrolet | Tahoe | 4WD | N/A | w/RPO Code NP1 (2 Speed, Electronic Shift, Transfer Case); Three Button Selection Switch |
| 2004 | GMC | Sierra 1500 | 4WD | N/A | w/RPO Code NP1 (2 Speed, Electronic Shift, Transfer Case); Three Button Selection Switch |
| 2004 | GMC | Sierra 2500 | 4WD | N/A | w/RPO Code NP1 (2 Speed, Electronic Shift, Transfer Case); Three Button Selection Switch |
| 2004 | GMC | Sierra 2500 HD | 4WD | N/A | w/RPO Code NP1 (2 Speed, Electronic Shift, Transfer Case); Three Button Selection Switch |
| 2004 | GMC | Sierra 3500 | 4WD | N/A | w/RPO Code NP1 (2 Speed, Electronic Shift, Transfer Case); Three Button Selection Switch |
| 2004 | GMC | Yukon | 4WD | N/A | w/RPO Code NP1 (2 Speed, Electronic Shift, Transfer Case); Three Button Selection Switch |
| 2004 | GMC | Yukon XL 1500 | 4WD | N/A | w/RPO Code NP1 (2 Speed, Electronic Shift, Transfer Case); Three Button Selection Switch |
| 2004 | GMC | Yukon XL 2500 | 4WD | N/A | w/RPO Code NP1 (2 Speed, Electronic Shift, Transfer Case); Three Button Selection Switch |
| 2003 | Chevrolet | Avalanche 1500 | 4WD | N/A | w/RPO Code NP1 (2 Speed, Electronic Shift, Transfer Case); Three Button Selection Switch |
| 2003 | Chevrolet | Avalanche 2500 | 4WD | N/A | w/RPO Code NP1 (2 Speed, Electronic Shift, Transfer Case); Three Button Selection Switch |
| 2003 | Chevrolet | Silverado 1500 | 4WD | N/A | w/RPO Code NP1 (2 Speed, Electronic Shift, Transfer Case); Three Button Selection Switch |
| 2003 | Chevrolet | Silverado 1500 HD | 4WD | N/A | w/RPO Code NP1 (2 Speed, Electronic Shift, Transfer Case); Three Button Selection Switch |
| 2003 | Chevrolet | Silverado 2500 | 4WD | N/A | w/RPO Code NP1 (2 Speed, Electronic Shift, Transfer Case); Three Button Selection Switch |
| 2003 | Chevrolet | Silverado 2500 HD | 4WD | N/A | w/RPO Code NP1 (2 Speed, Electronic Shift, Transfer Case); Three Button Selection Switch |
| 2003 | Chevrolet | Silverado 3500 | 4WD | N/A | w/RPO Code NP1 (2 Speed, Electronic Shift, Transfer Case); Three Button Selection Switch |
| 2003 | Chevrolet | Suburban 1500 | 4WD | N/A | w/RPO Code NP1 (2 Speed, Electronic Shift, Transfer Case); Three Button Selection Switch |
| 2003 | Chevrolet | Suburban 2500 | 4WD | N/A | w/RPO Code NP1 (2 Speed, Electronic Shift, Transfer Case); Three Button Selection Switch |
| 2003 | Chevrolet | Tahoe | 4WD | N/A | w/RPO Code NP1 (2 Speed, Electronic Shift, Transfer Case); Three Button Selection Switch |
| 2003 | GMC | Sierra 1500 | 4WD | N/A | w/RPO Code NP1 (2 Speed, Electronic Shift, Transfer Case); Three Button Selection Switch |
| 2003 | GMC | Sierra 1500 HD | 4WD | N/A | w/RPO Code NP1 (2 Speed, Electronic Shift, Transfer Case); Three Button Selection Switch |
| 2003 | GMC | Sierra 2500 | 4WD | N/A | w/RPO Code NP1 (2 Speed, Electronic Shift, Transfer Case); Three Button Selection Switch |
| 2003 | GMC | Sierra 2500 HD | 4WD | N/A | w/RPO Code NP1 (2 Speed, Electronic Shift, Transfer Case); Three Button Selection Switch |
| 2003 | GMC | Sierra 3500 | 4WD | N/A | w/RPO Code NP1 (2 Speed, Electronic Shift, Transfer Case); Three Button Selection Switch |
| 2003 | GMC | Yukon | 4WD | N/A | w/RPO Code NP1 (2 Speed, Electronic Shift, Transfer Case); Three Button Selection Switch |
| 2003 | GMC | Yukon XL 1500 | 4WD | N/A | w/RPO Code NP1 (2 Speed, Electronic Shift, Transfer Case); Three Button Selection Switch |
| 2003 | GMC | Yukon XL 2500 | 4WD | N/A | w/RPO Code NP1 (2 Speed, Electronic Shift, Transfer Case); Three Button Selection Switch |
* Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.
This part directly replaces or is cross-referenced with the following part numbers:
12590219
Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.