# Service bulletin 030421001D

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: 10005166
- Published by NHTSA: 2004\-02\-11
- Manufacturer's number: 030421001D
- Manufacturer's date: 2003\-12\-01
- Replaces: 030421001C
- NHTSA component: POWER TRAIN:TRANSFER CASE \(4\-WHEEL DRIVE\)

## NHTSA's summary

4\-WHEEL DRIVE SWITCH INDICATOR LIGHTS FLASHING, 4\-WHEEL DRIVE INOPERATIVE, DIAGNOSTIC TROUBLE CODES C0327, P0836, P0500. \*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

## Trouble codes named

C0327, P0500, P0836

## Vehicles listed

- 2003 CHEVROLET AVALANCHE
- 2003 CHEVROLET SILVERADO
- 2003 CHEVROLET SUBURBAN
- 2003 CHEVROLET TAHOE
- 2003 GMC YUKON

## 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.
- [3665](/bulletins/10018926.md), 2006-01-25, Service bulletin: POWER TRAIN:TRANSFER CASE \(4\-WHEEL DRIVE\). 4WD INOPERATIVE AND POSSIBLE DTC C0327 STORED IN THE TRANSFER CASE CONTROL MODULE. \*TT
- [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
- [3424](/bulletins/10017299.md), 2005-11-02, Service bulletin: POWER TRAIN:TRANSFER CASE \(4\-WHEEL DRIVE\). ELECTRONIC TRANSFER CASE UNABLE TO COMPLETE SHIFT. \*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
- [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
- [011603](/bulletins/10005105.md), 2004-01-30, Service bulletin: POWER TRAIN:TRANSFER CASE \(4\-WHEEL DRIVE\). CONCERNS WITH THE SERVICE FOUR\-WHEEL DRIVE LIGHT OR THE FOUR\-WHEEL DRIVE IS INOPERATIVE WITH A C0327 CODE STORED IN THE TCCM. GM VOICEMAIL EXPRESS. \*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
- [01267B](/bulletins/10004200.md), 2003-11-21, Service bulletin: POWER TRAIN:TRANSFER CASE \(4\-WHEEL DRIVE\). SERVICE 4WD LIGHT ON NO CODES BESIDES U1000 CODES. SERVICE VME. \*TT

JSON: [/v1/bulletins/10005166](/v1/bulletins/10005166)

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