For 1990-2009 cars

# Info - Guidelines for Proper Use of Labor Operation Numbers when Servicing Transfer Case

Subject: | Guidelines for Proper Use of Labor Operation Numbers When Servicing Transfer Case

Models: | 2006 and Prior Passenger Cars and Light/Medium Duty Trucks

| 2006 and Prior HUMMER H2

| 2006 HUMMER H3

| with Four-Wheel Drive (4WD) or All-Wheel Drive (AWD) System

When servicing the transfer case, some dealers are using the incorrect labor operation number when submitting warranty claims. The following information is a guideline to further assist dealers in the proper use of transfer case related labor operation numbers. This information provides the correct labor operation number/description, vehicle application and vehicle exceptions.

Labor Operation | Description
--- | ---
K4120 | Switch, Vacuum Control - Replace

• | This labor operation applies to NVG 233 and NVG 236 (RPO NP1 and NP8) transfer cases.

• | The following transfer cases DO NOT incorporate a vacuum switch. Labor operation K4120 will NOT apply to these transfer cases.

- | NVG 263 (RPO NP1)

- | Isuzu T150 (RPO NP1)

- | NVG 261 (RPO NP2)

- | NVG 149 (RPO NP3)

- | NVG 126/136 (RPO NP4)

- | NVG 226/236/246 (RPO NP8)

- | BW 4481/4476 (RPO NR3)

- | BW 4482/4484/4493 (RPO NR4)

- | BW 4494 (RPO NR6)

- | BW 4473 (RPO NP3)

Labor Operation | Description
--- | ---
K4121 | Module, Transfer Case - Reprogram

The following transfer cases DO NOT incorporate reprogrammable modules. Labor operation K4121 will NOT apply to these transfer cases.

• | Isuzu T150/NVG 233 (RPO NP1)

• | NVG 261 (RPO NP2)

• | NVG 149 (RPO NP3)

• | NVG 136 (RPO NP4)

• | NVG 236 (RPO NP8)

• | NVG 246 (RPO NP8) (1998-2002)

• | BW 4481/4476 (RPO NR3)

• | BW 4482/4484 (RPO NR4)

• | BW 4473 (RPO NP3)

Labor Operation | Description
--- | ---
K4122 | Module, Transfer Case Shift - Replace

The following transfer cases DO NOT incorporate shift control modules. Labor operation K4122 will NOT apply to these transfer cases.

• | NVG 261 (RPO NP2)

• | NVG 149 (RPO NP3)

• | BW 4476/4481 (RPO NR3)

• | BW 4473 (RPO NP3)

Labor Operation | Description
--- | ---
K4123 | Switch, Transfer Case Select - Replace

The following transfer cases DO NOT incorporate shift select switches. Labor operation K4123 will NOT apply to these transfer cases.

• | NVG 261 (RPO NP2)

• | NVG 149 (RPO NP3)

• | NVG 126/136 (RPO NP4)

• | BW 4476/4481 (RPO NR3)

• | BW 4473 (RPO NP3)

Labor Operation | Description
--- | ---
K4124 | Sensor Assembly, Transfer Case Range Selector - Replace

The following transfer cases DO NOT have replaceable actuator position sensors. Labor operation K4124 will NOT apply to these transfer cases.

• | Isuzu T-150 (RPO NP1)

• | NVG 261 (RPO NP2)

• | NVG 136 (RPO NP4)

• | NVG 149 (RPO NP3)

• | NVG 233 (RPO NP1)

• | NVG 236 (RPO NP8)

• | NVG 246 (RPO NP8) (1998-2002)

• | BW 4476/4481 (RPO NR3)

• | BW 4482/4484/4493 (RPO NR4)

• | BW 4494 (RPO NR6)

• | BW 4473 (RPO NP3)

Labor Operation | Description
--- | ---
K4126 | Actuator Assembly, Transfer Case - Replace

The following transfer cases are NOT equipped with actuator assemblies. Labor operation K4126 will NOT apply to these transfer cases.

• | NVG 261 (RPO NP2)

• | NVG 149 (RPO NP3)

• | BW 4481/4476 (RPO NR3)

• | BW 4473 (RPO NP3)

#### RPO Definitions

RPO | Description
--- | ---
NP1 | Transfer Case - Electronic Shift Control, Two-Speed
NP2 | Transfer Case - Manual Shift Control, Two-Speed
NP3 | Transfer Case - All Wheel Drive (AWD)
NP4 | Transfer Case - Active, All Wheel Drive (AWD)
NP8 | Transfer Case - Active, Two-Speed, Push Button Control
NR3 | Transfer Case - All Wheel Drive (AWD), Open Diff., Single Speed
NR4 | Transfer Case - Four Wheel Drive (4WD), Open Diff., Two-Speed
NR6 | Transfer Case - Four Wheel Drive (4WD), Open Diff., Two-Speed, High Ratio