2003 Chevrolet Trailblazer EXT Service and Repair Manual

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Factory-Grade Data

2003 Chevrolet Trailblazer EXT service and repair manual — a detailed, factory-style reference for maintenance, diagnostics, and repair. Use it to confirm correct procedures, specifications, and system coverage before you start work.

Designed for technicians and DIY owners, this manual helps you troubleshoot accurately, follow step-by-step repair procedures, and reference wiring diagrams and system sections quickly while you work.

What’s included

  • Step-by-step repair procedures and service information
  • Specifications and reference data (where provided)
  • Wiring diagrams and electrical sections
  • Powertrain, brakes, steering, suspension, HVAC and more

Trims covered

  • SS Sport Utility 4-Door
  • LT Sport Utility 4-Door

Engines covered

  • 6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated
  • 4.2L 256Cu. In. l6 GAS DOHC Naturally Aspirated

Index / Table of contents

  • Body
  • Brakes
  • Chassis Electrical
  • Driveline
  • Engine Cooling
  • Engine Electrical
  • Engine Mechanical
  • Engine Performance & Emission Controls
  • Fuel System
  • General Information & Identification
  • Heating, Ventilation, & Air Conditioning
  • Hybrid & Electric Vehicle Systems
  • Steering
  • Suspension
  • Transmission, Clutch, & Transfer Case
  • Wiring Diagrams

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  • Visa

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Vehicle Safety Data

2003 Chevrolet Trailblazer EXT Recalls & Complaints

NHTSA #05V49400027/10/2005Component: LATCHES/LOCKS/LINKAGES:DOORS:LATCH

CERTAIN SPORT UTILITY VEHICLES HAVE A REAR SIDE CLOSURE LATCH THAT MAY NOT LATCH OR UNLATCH DUE TO CORROSION CAUSED BY ROAD SPLASH, SUCH AS WATER AND ROAD SALT. THESE VEHICLES WER

Consequence

IF THE DOOR IS NOT LATCHED PROPERLY AND IT GOES UNNOTICED, IT MAY OPEN WHILE THE VEHICLE I

Remedy

DEALERS WILL INSTALL A SEAL ALONG THE LOWER PART OF THE ROCKER PANEL TO PREVENT INTRUSION

NHTSA #04V04600004/02/2004Component: VISIBILITY:WINDSHIELD WIPER/WASHER

CERTAIN SPORT UTILITY VEHICLES HAVE WINDSHIELD WIPER SYSTEMS THAT WILL NOT TURN ON, CEASE OPERATION WHILE IN USE, FAIL TO TURN OFF/ON BY THEMSELVES (MOISTURE SENSITIVE WIPER SYSTEM

Consequence

DEPENDING ON THE OCCURRENCE AND WEATHER SITUATION, DRIVER VISIBILITY COULD BE REDUCED, WHI

Remedy

DEALERS WILL COVER THE WINDSHIELD WIPER MODULE VENT HOLE WITH A PATCH. ALSO, THE WIPER MO

NHTSA #04V52700001/11/2004Component: EXTERIOR LIGHTING:BRAKE LIGHTS

ON CERTAIN SPORT UTILITY VEHICLES, VIBRATION AND HEAT MAY CAUSE THE TAIL LAMP/STOP LAMP BULB TO LOOSEN IN ITS SOCKET. IF THIS OCCURS, THE BULB MAY FLICKER AND EVENTUALLY BECOME IN

Consequence

AN INOPERATIVE BRAKE LAMP WILL NOT CONVEY THE DRIVER'S INTENTION OF STOPPING TO DRIVERS IN

Remedy

DEALERS WILL INSPECT THE TAIL LAMP/STOP LAMP ASSEMBLIES, AND IF NECESSARY, REPLACE THEM.

TSB #11020816

This PI communicates the requirement to provide a pico file to receive diagnostic assistance from TAC.

TSB #11007208

This Preliminary Information communication provides information to the technician about changing the tire and wheel size on vehicles. General Motors will only support a tire calibration for tires that have been sized, tested and designed fo

TSB #11006621

Vehicle Wide Programming (VWP) is a new process to update software on GM Vehicles. It provides the ability via a single selection within Techline Connect to first identify which modules need updating and then proceed to updating affected mo

TSB #11006421

GM is receiving damaged (cracked or broken) transmission cores returned to the reman facilities. The damage is being caused either in the removal process by the technician, or inadequate packaging or shipping. This bulletin advises the deal

TSB #11004761

This service bulletin advises of a new fuel injection cleaner kit used for decarbonizing the intake valves to correct conditions of rough idle, Crank no start, extended crank or misfire, MIL with DTCs, and explains how Top Tier fuels should

TSB #11004557

This bulletin provides information for use on a Product Assistance Claim (PAC), which is formerly known as a Product Allegation Resolution (PAR) claim.

TSB #11002312

This service bulletin provides information for dealers/technicians on Service Programming System (SPS) Error Codes E4398, E4399, E4401, E4403, M4404, M4413, M6954, M6955, E4414, E4423, E4491, E4492, or E6961 and resolution information.

TSB #11000576

This Warranty Administration bulletin provides retail and wholesale service personnel with the policies/procedures and the warranty transaction submission procedures that support the Personal Property Damage process.

Showing the 8 most recent of 105 technical service bulletins on file with NHTSA.

20040826Component: AIR BAGS:FRONTALCrash reported3 injured

WE WERE INVOLVED IN AN AUTOMOBILE ACCIDENT WHILE DRIVING A 2003 TRAILBLAZER XT. A DRIVER TURNED IN FRONT OF US AT AN INTERSECTION ON A BUSY HIGHWAY WHILE WE HAD A GREEN LIGHT. I

20150107Component: AIR BAGSCrash reported1 injured

IT WAS SLEETING AND I LOST CONTROL ON A CURVE. I HAD BEEN DRIVING ABOUT 50 MPH, BUT BRAKE BEFORE THE CURVE AND BRAKE VERY HARD WHEN I TRIED TO REGAIN CONTROL OF THE VEHICLE, AS IT

20060317Component: AIR BAGSCrash reported1 injured

DT*: THE CONTACT STATED WHILE TRAVELING 75 MPH THE VEHICLE SWERVED TO THE RIGHT AND THEN OVER CORRECTED. THE VEHICLE WENT INTO A DITCH, THEN FLIPPED SEVERAL TIMES HOWEVER, THE AI

20050601Component: SEATSCrash reported1 injured

DRIVERS SEAT WILL MOVE TO THE "EXIT POSISTION" WHILE DRIVING. THE LAST TIME THIS HAPPENED THE DRIVER WAS PULLED AWAY FROM THE BRAKE PEDAL WHILE MAKING A RIGHT HAND TURN AND DROVE O

Showing the 4 most serious of 406 complaints filed with NHTSA.

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