# Service bulletin 3131

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: 10010052
- Published by NHTSA: 2004\-11\-04
- Manufacturer's number: 3131
- Manufacturer's date: 2004\-01\-01
- NHTSA component: POWER TRAIN:TRANSFER CASE \(4\-WHEEL DRIVE\)

## NHTSA's summary

4WD INOPERATIVE WITH POSSIBLE DIAGNOSTIC TROUBLE CODE'S B0770, B0775, B0780, B0785, OR B2725. 2005 CHEVROLET TRAILBLAZER AND TRAILBLAZER EXT. \*SC

## 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

## Trouble codes named

B0770, B0775, B0780, B0785, B2725

## Vehicles listed

- 2005 GMC ENVOY
- UNKNOWN UNKNOWN

## 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.
- [05\-04\-21\-003](/bulletins/10017464.md), 2005-11-09, Service bulletin: POWER TRAIN:TRANSFER CASE \(4\-WHEEL DRIVE\). SERVICE 4WD LIGHT ILLUMINATED, DIAGNOSTIC TROUBLE CODE \(DTC\) C0374 SET. \*TT UPDATED 10/05/07. \*NJ INSPECT WIRING HARNESS TO TRANSFER CASE SPEED SENSORS, REPLACE WIRING HARNESS. UPDATED 7/18/08 \*PE
- [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
- [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

JSON: [/v1/bulletins/10010052](/v1/bulletins/10010052)

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