Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSCHEVROLET2003TRAILBLAZER 4WD L6-4.2L VIN SREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSTECHNICAL SERVICE BULLETINS
2003 Chevrolet TrailBlazer 4WD L6-4.2L VIN S
Computers and Control Systems: Technical Service Bulletins
2003 Chevrolet TrailBlazer 4WD L6-4.2L VIN SSECTION Technical Service Bulletins
- Customer Interest
- Electrical - MIL ON/DTC's Set By Various Control Modules
- Drivetrain - Service 4WD Light/DTC C0374 Set
- Engine, A/T - Shift/Driveability Concerns/MIL ON
- Ignition System - MIL ON/Misfire DTC's In Wet Weather
- Electrical - SES Lamp ON/DTC's P0480/P0526/P1481/P1484
- AWD/4WD - AWD/4WD Lamps/System Inop./DTC C0550
- Electrical - A/T Stuck in 2nd/3rd Gear/MIL ON/DTC's
- Engine Controls - A/T Slipping/No SES Lamp/No DTC Set
- Drivetrain - 4X4 Lamp Flashing/4WD Inoperative/DTC's Set
- Engine Controls - SES Lamp ON/DTC's P0133/P0172
- A/T - No Start/MIL ON/DTC P0706/Indicator Inaccurate
- Transfer Case Control Module - 4WD Lamp ON/DTC'S Set
- Drivetrain - 'Service 4WD' Indicator ON/DTC B2725 Set
- Computers And Controls - DTC's Set Replacing Modules
- Instruments - Erratic Speedometer Operation
- By Symptom
- Abnormal wear/deterioration
- Customer Interest
- Electrical - MIL ON/DTC's Set By Various Control Modules
- Drivetrain - Service 4WD Light/DTC C0374 Set
- Engine, A/T - Shift/Driveability Concerns/MIL ON
- Ignition System - MIL ON/Misfire DTC's In Wet Weather
- Electrical - SES Lamp ON/DTC's P0480/P0526/P1481/P1484
- AWD/4WD - AWD/4WD Lamps/System Inop./DTC C0550
- Electrical - A/T Stuck in 2nd/3rd Gear/MIL ON/DTC's
- Engine Controls - A/T Slipping/No SES Lamp/No DTC Set
- Drivetrain - 4X4 Lamp Flashing/4WD Inoperative/DTC's Set
- Engine Controls - SES Lamp ON/DTC's P0133/P0172
- A/T - No Start/MIL ON/DTC P0706/Indicator Inaccurate
- Transfer Case Control Module - 4WD Lamp ON/DTC'S Set
- Drivetrain - 'Service 4WD' Indicator ON/DTC B2725 Set
- Computers And Controls - DTC's Set Replacing Modules
- Instruments - Erratic Speedometer Operation
- Driveability
- Erratic Operation
- Erratic Shifting
- False instrument warning light/gauges
- Incorrect gear selection
- Inoperative
- Leaks
- Loose
- No shift/Incorrect gear engagement
- Slipping
- Warping
- All Technical Service Bulletins
- Engine - THIS BULLETIN HAS BEEN CANCELED
- Electrical - MIL ON/DTC's Set By Various Control Modules
- A/T Control - DTC P0756 Diagnostic Tips
- A/T - Diagnostic Information for DTC's P0894/P1870
- Drivetrain - Service 4WD Light/DTC C0374 Set
- Engine, A/T - Shift/Driveability Concerns/MIL ON
- Ignition System - MIL ON/Misfire DTC's In Wet Weather
- Electrical - SES Lamp ON/DTC's P0480/P0526/P1481/P1484
- Emissions - OBDII I/M Readiness Testing
- Engine Controls - MIL Function During I/M Testing
- AWD/4WD - AWD/4WD Lamps/System Inop./DTC C0550
- Accessories - DTC's P0300, P1380, P1381
- Electrical - A/T Stuck in 2nd/3rd Gear/MIL ON/DTC's
- Electrical - Harness Connection Inspection
- Emissions - DTC P0440/P0455/P0442 (EVAP) Diagnostics
- Engine Controls - A/T Slipping/No SES Lamp/No DTC Set
- Drivetrain - 4X4 Lamp Flashing/4WD Inoperative/DTC's Set
- Engine Controls - SES Lamp ON/DTC's P0133/P0172
- A/T - No Start/MIL ON/DTC P0706/Indicator Inaccurate
- Transfer Case Control Module - 4WD Lamp ON/DTC'S Set
- Drivetrain - 'Service 4WD' Indicator ON/DTC B2725 Set
- Computers And Controls - DTC's Set Replacing Modules
- Instruments - Erratic Speedometer Operation
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.