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Service bulletins for the 2003 Chevrolet Trailblazer

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.

682 on file from NHTSA, as of 2026-10-19.

By type

By component

By trouble code

Only bulletins with component: Engine are shown. Show all

Bulletins, newest first
32322005-01-28. Service bulletin. ENGINE AND ENGINE COOLING. MISFIRE AT IDLE COLD AND POSSIBLE P0171 AND OR P0174. *EH
0406020052005-01-11. Service bulletin. ENGINE AND ENGINE COOLING:ENGINE. HIGHER THAN NORMAL ENGINE COOLANT TEMPERATURE GAUGE READINGS. *TT
31502004-12-01. Service bulletin. ENGINE AND ENGINE COOLING. CYLINDER LINER REPLACEMENT INFORMATION - INLINE TRUCK ENGINES. *EH
30562004-11-17. Service bulletin. ENGINE AND ENGINE COOLING:ENGINE. CHECK ENGINE LIGHT WITH A P0300 DUE TO 2-4 CYLINDERS MISFIRING ON THE SAME BANK OF THE ENGINE. *TT
31542004-11-09. Service bulletin. ENGINE AND ENGINE COOLING:ENGINE. MISFIRE, BUMP OR MULTIPLE BUMPS AFTER A 1-2 UPSHIFT. *TT
31422004-11-05. Service bulletin. ENGINE AND ENGINE COOLING:ENGINE. BROKEN HEAD BOLT REPAIR. *TC
30772004-10-15. Service bulletin. ENGINE AND ENGINE COOLING:COOLING SYSTEM:FAN. TICK NOISE AT IDLE. *TT
30762004-10-13. Service bulletin. ENGINE AND ENGINE COOLING:ENGINE. REPLACEMENT GOODWRENCH ENGINES - PARTS WHICH MUST BE SWAPPED FROM ORIGINAL ENGINE. *TT
010120042004-10-07. Service bulletin. ENGINE AND ENGINE COOLING. HIGH COOLANT TEMPERATURE GAUGE READINGS DURING LOW RPM OPERATION. *TT
30862004-10-04. Service bulletin. ENGINE AND ENGINE COOLING:ENGINE. WHISTLE NOISE FROM THE THROTTLE BODY AREA ON LIGHT THROTTLE ACCELERATION ON VEHICLES WITH GEN III ENGINES AND ELECTRONIC THROTTLE. *TT
30412004-09-27. Service bulletin. ENGINE AND ENGINE COOLING:ENGINE. SERVICE ENGINE SOON LIGHT AND / OR REDUCED ENGINE POWER MODE DUE TO DIAGNOSTIC TROUBLE CODES P0120, P0220, P1516 AND/OR P1518. THIS CONDITION IS NORMALLY VERY INTERMITTENT. *TT
30182004-08-23. Service bulletin. ENGINE AND ENGINE COOLING:ENGINE. ENGINE CYLINDER HEAD CUP PLUG COOLANT LEAK. *MJ
0406030052004-08-13. Service bulletin. ELECTRICAL SYSTEM; ENGINE AND ENGINE COOLING:ENGINE. PROPER CONNECTION INFORMATION TO AVOID BLOWN 125 AMP FUSE AND VARIOUS INTERIOR ELECTRICAL SYSTEM CONDITIONS WHEN JUMP STARTING VEHICLE. *TT
0406010032004-08-13. Service bulletin. ENGINE AND ENGINE COOLING:ENGINE. INFORMATION ON 2ND DESIGN BALANCER HUB. *TT
0406010152004-08-03. Service bulletin. ENGINE AND ENGINE COOLING:ENGINE. NEW DESIGN OIL PICK UP TUBE AND FRONT COVER. *MJ
013532004-07-16. Service bulletin. ENGINE AND ENGINE COOLING:ENGINE. ENGINE MISFIRE DUE TO INJECTOR FRETTING CORROSION. *TT
02064A2004-07-13. Service bulletin. ENGINE AND ENGINE COOLING:ENGINE. A DIM SERVICE ENGINE SOON (SES) LIGHT MAY BE NOTED WITH THE IGNITION KEY IN THE ACCESSORY POSITION. *TT
021292004-07-12. Service bulletin. ENGINE AND ENGINE COOLING:ENGINE. ROUGH IDLE OR IDLE SHAKE AT TIMES. *TT
00156A2004-07-07. Service bulletin. ENGINE AND ENGINE COOLING:ENGINE. 4.2L LL8 ENGINE ROUGH IDLE - RUN POSSIBLE P1345 OR P0016. *MJ *TT
016722004-06-04. Service bulletin. ENGINE AND ENGINE COOLING:ENGINE. OIL PAN DRAIN PLUG THREADS - INFORMATION. *TT
020232004-06-04. Service bulletin. ENGINE AND ENGINE COOLING:ENGINE. INTERMITTENT NO CRANK NO START. SECURITY LIGHT MAY BE ON OR OFF. 4.2 LL8 ENGINE. *NM
016762004-06-03. Service bulletin. ENGINE AND ENGINE COOLING:COOLING SYSTEM:FAN. 4.2 4L60E ENGINE COOLING FAN CONTACTS SHROUD AFTER REPLACING RADIATOR. *MR
0306040622004-03-03. Service bulletin. ENGINE AND ENGINE COOLING:ENGINE. THIS BULLETIN IS BEING ISSUED TO REVISE STEP 4 OF DIAGNOSTIC TROUBLE CODE (DTC) P2135. *TT
030601028A2004-03-03. Service bulletin. ENGINE AND ENGINE COOLING:ENGINE. INFORMATION ON CORRECT PISTON USAGE. *TT UPDATED *EH
00969A2004-02-28. Service bulletin. ENGINE AND ENGINE COOLING:ENGINE. ENGINE WHISTLE NOISE. *TT

The summaries are NHTSA's. Each bulletin's page links NHTSA's copy of the manufacturer's document.