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Service bulletin 031203

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.

The communication, as NHTSA indexes it (as of 2026-10-19)
TypeService bulletin
NHTSA id10001912
Published by NHTSA2003-07-25
Manufacturer's number031203
Manufacturer's date2003-03-12
NHTSA componentSUSPENSION:REAR:SPRINGS:AIR SUSPENSION SYSTEM

NHTSA's summary

AUTOMATIC LEVELING FEATURE OF THE REAR SUSPENSION IS NOT FUNCTIONING WITH POSSIBLE DIAGNOSTIC TROUBLE CODE U1000 SET. *TT *JB

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

Suspension, Air suspension

Trouble codes named

U1000

Vehicles listed
HUMMER H22003

Listing a model year does not mean every vehicle of it is concerned: the document says which.

Other bulletins for the same vehicles and component
PIT51942017-08-15. Service bulletin. This Preliminary Information communication provides information to the technician about vehicles that will no longer sit level after rear suspension has been serviced. Technician should correctly install the air spring lines that are incorrectly connected.
3367A2005-11-07. Service bulletin. REAR AIR SUSPENSION - TRIM HEIGHT TOOL SET. *TT
34612005-10-29. Service bulletin. REAR AIR SUSPENSION IN-OP DTC C0563. *TT
081820042005-04-07. Service bulletin. SINGLE REAR AIR SUSPENSION COMPRESSOR DISCONTINUED AND IS REPLACED WITH THE DUAL AIR COMPRESSOR USED ON THE 2005 MODEL. *TT
31372004-11-03. Service bulletin. REAR AIR SUSPENSION COMPRESSOR SERVICE PART CHANGE. *SC
0318032003-07-25. Service bulletin. PRECAUTIONARY MEASURES WHEN CONDUCTING REPAIRS ON VEHICLES EQUIPPED WITH THE REAR AIR SUSPENSION. *TT *JB
0305032003-07-24. Service bulletin. REPLACEMENT OF REAR AIR SUSPENSION COMPONENTS. *TT *JB