# Service bulletin 3012B

A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.

- Type: Service bulletin
- NHTSA id: 10008806
- Published by NHTSA: 2004\-08\-23
- Manufacturer's number: 3012B
- Replaces: 3012A
- NHTSA component: POWER TRAIN:TRANSFER CASE \(4\-WHEEL DRIVE\)

## NHTSA's summary

THE NVG 136 ALL WHEEL DRIVE \(AWD\) TRANSFER CASE AND THE 236 AND 246 NVG SELECTABLE TRANSFER CASES OPERATING IN THE AUTO MODE MAY EXHIBIT A CONDITION OF A VIBRATION/SHUDDER DURING LOW SPEED TURNS SUCH AS A PARKING LOT MANEUVER, UP TO APPROXIMATELY 5 MPH. \*TT 3012A NOT YET RECEIVED. \*TT

## The document

No address for NHTSA's copy can be built for this communication. Ask the dealer for it by the manufacturer's number.

## Components

Transmission and driveline, Transfer case

## Vehicles listed

- 1999 to 2002 CADILLAC ESCALADE
- 1999 to 2004 CHEVROLET ASTRO
- 1999 to 2004 CHEVROLET BLAZER
- 1999 to 2002 CHEVROLET SILVERADO
- 1999 to 2002 CHEVROLET SUBURBAN
- 1999 to 2002 CHEVROLET TAHOE
- 1999 to 2001 GMC ENVOY
- 2002 GMC ENVOY
- 1999 to 2004 GMC JIMMY
- 1999 to 2004 GMC SAFARI
- 1999 to 2002 GMC SIERRA
- 1999 to 2000 GMC SUBURBAN
- 2001 to 2002 GMC SUBURBAN
- 1999 to 2002 GMC YUKON
- 1998 to 2001 OLDSMOBILE BRAVADA

## Recalls for the same vehicles and component

- [01V334000](/recalls/nhtsa/01V334000.md), 2001-10-17: POWER TRAIN:TRANSFER CASE \(4\-WHEEL DRIVE\)
- [01V283000](/recalls/nhtsa/01V283000.md), 2001-09-05: POWER TRAIN:TRANSFER CASE \(4\-WHEEL DRIVE\)

## Other bulletins for the same vehicles and component

- [PIP3366C](/bulletins/10143757.md), 2018-08-20, Service bulletin: POWER TRAIN:TRANSFER CASE \(4\-WHEEL DRIVE\); POWER TRAIN:AUTOMATIC TRANSMISSION. This Preliminary information communicates to the dealer technician thatLight Duty Trucks equipped with automatic transmissions and 4 wheel drive may exhibit a condition of grinding/ratcheting type noise when shifting the automatic transmission into park while the transfer case is in 4 wheel drive low \(4LO\) range. Dealers technician\&\#39;s are advised this condition should be deemed a normal characteristic of 4WD low operation.
- [040421004](/bulletins/10017442.md), 2005-11-08, Service bulletin: POWER TRAIN:TRANSFER CASE \(4\-WHEEL DRIVE\). 4WD SWITCH INDICATOR LIGHTS FLASHING, 4WD INOPERATIVE, DIAGNOSTIC TROUBLE CODES C0327, P0550 SET. \*TT
- [3424](/bulletins/10017299.md), 2005-11-02, Service bulletin: POWER TRAIN:TRANSFER CASE \(4\-WHEEL DRIVE\). ELECTRONIC TRANSFER CASE UNABLE TO COMPLETE SHIFT. \*TT
- [3389](/bulletins/10016707.md), 2005-09-28, Service bulletin: POWER TRAIN:TRANSFER CASE \(4\-WHEEL DRIVE\). FOUR WHEEL DRIVE INOPERATIVE AND THE 4WD SERVICE LIGHT WILL ILLUMINATE. DIAGNOSIS MAY REVEAL THAT THE ATC FUSE COULD BE OPEN, POSSIBLE DTC C0308, OR VARIOUS U CODES MAY BE SET. THE ENCODER MOTOR MAY ALSO BE SHORTED OR THE TCCM MAY BE DAMAGED. \*TT
- [3526](/bulletins/10016558.md), 2005-09-22, Service bulletin: POWER TRAIN:TRANSFER CASE \(4\-WHEEL DRIVE\). INTERMITTENT SERVICE 4WD LIGHT COMES ON WITH DIAGNOSTIC TROUBLE CODE \(DTC\) C0306 OR C0308 STORED IN TCCM. \*TT
- [3351](/bulletins/10014853.md), 2005-05-11, Service bulletin: POWER TRAIN:TRANSFER CASE \(4\-WHEEL DRIVE\). INTERMITTENT MALFUNCTION INDICATOR LAMP \(MIL\) WITH DIAGNOSTIC TROUBLE CODE \(DTC\) C0374 OR ERRATIC 4WD/AWD OPERATION. \*TT
- [3349](/bulletins/10014809.md), 2005-05-10, Service bulletin: POWER TRAIN:TRANSFER CASE \(4\-WHEEL DRIVE\). 4WD INOPERATIVE AND DIAGNOSTIC TROUBLE CODE \(DTC\) U1026 ATC FUSE OPEN. \*TT
- [3132A](/bulletins/10010024.md), 2004-11-03, Service bulletin: TIRES; POWER TRAIN:TRANSFER CASE \(4\-WHEEL DRIVE\). NVG149 NP3 TRANSFER CASE MAY EXHIBIT A BIND OR SHUDDER ON TURNS. \*TC
- [01843](/bulletins/10007961.md), 2004-07-19, Service bulletin: POWER TRAIN:TRANSFER CASE \(4\-WHEEL DRIVE\). CALIBRATION FOR IMPROVED TRANSFER CASE OPERATION IN AWD MODE. \*TT
- [020421006C](/bulletins/10004357.md), 2003-12-04, Service bulletin: POWER TRAIN:TRANSFER CASE \(4\-WHEEL DRIVE\). INOPERATIVE 4WD/AWD LAMPS, INOPERATIVE 4WD/AWD SYSTEM. \*TT

JSON: [/v1/bulletins/10008806](/v1/bulletins/10008806)

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