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 MANUALSCHEVROLET2004EXPRESS 2500 2WD V8-6.0L VIN UREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSTECHNICAL SERVICE BULLETINS
2004 Chevrolet Express 2500 2WD V8-6.0L VIN U
Computers and Control Systems: Technical Service Bulletins
2004 Chevrolet Express 2500 2WD V8-6.0L VIN USECTION Technical Service Bulletins
- Customer Interest
- Electrical - MIL ON/DTC's Set By Various Control Modules
- A/T - Slips/Harsh Shifts/Delayed Shifts/Multiple DTC's
- Engine, A/T - Shift/Driveability Concerns/MIL ON
- Engine Controls - MIL ON/Misfire/Misfire DTC's Set
- Electrical - A/T Stuck in 2nd/3rd Gear/MIL ON/DTC's
- Engine - Rough Idle/Misfire/MIL ON/DTC P0300
- Brakes - ABS Light ON/Multiple DTC's Present
- Electrical - Various Malfunctions/Lamps ON/DTC's Set
- Engine Controls/Electrical - MIL ON/DTC's/Driveability
- Instruments - High/Low Erratic Oil Pressure Readings
- By Symptom
- Abnormal wear/deterioration
- Customer Interest
- Electrical - MIL ON/DTC's Set By Various Control Modules
- A/T - Slips/Harsh Shifts/Delayed Shifts/Multiple DTC's
- Engine, A/T - Shift/Driveability Concerns/MIL ON
- Engine Controls - MIL ON/Misfire/Misfire DTC's Set
- Electrical - A/T Stuck in 2nd/3rd Gear/MIL ON/DTC's
- Engine - Rough Idle/Misfire/MIL ON/DTC P0300
- Brakes - ABS Light ON/Multiple DTC's Present
- Electrical - Various Malfunctions/Lamps ON/DTC's Set
- Engine Controls/Electrical - MIL ON/DTC's/Driveability
- Instruments - High/Low Erratic Oil Pressure Readings
- Driveability
- Erratic Operation
- Erratic Shifting
- False instrument warning light/gauges
- Hard Shifting
- Loose
- No shift/Incorrect gear engagement
- Slipping
- All Technical Service Bulletins
- Engine Controls - Non-GM Engine/Transmission Calibration ID
- Engine - THIS BULLETIN HAS BEEN CANCELED
- A/T Controls - Snapshot Data With Tech2(R) Information
- 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
- A/T - MIL ON/DTC P0757/Harsh or Slipping 2-3 Shift
- A/T - Slips/Harsh Shifts/Delayed Shifts/Multiple DTC's
- Engine, A/T - Shift/Driveability Concerns/MIL ON
- Emissions - OBDII I/M Readiness Testing
- Engine Controls - MIL ON/Misfire/Misfire DTC's Set
- Engine Controls - MIL Function During I/M Testing
- Accessories - DTC's P0300, P1380, P1381
- Electrical - A/T Stuck in 2nd/3rd Gear/MIL ON/DTC's
- Electrical - Harness Connection Inspection
- Engine - Rough Idle/Misfire/MIL ON/DTC P0300
- Brakes - ABS Light ON/Multiple DTC's Present
- Electrical - Various Malfunctions/Lamps ON/DTC's Set
- Engine Controls/Electrical - MIL ON/DTC's/Driveability
- Engine Controls - Revised DTC P0336
- Instruments - High/Low Erratic Oil Pressure Readings
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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.