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 MANUALSCHEVROLET2004TAHOE 2WD V8-4.8L VIN VREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTTRANSMISSION CONTROL SYSTEMSTECHNICAL SERVICE BULLETINSENGINE CONTROLS - NON-GM ENGINE/TRANSMISSION CALIBRATION IDSECTIONSSECTION 4
2004 Chevrolet Tahoe 2WD V8-4.8L VIN V
Section 4
2004 Chevrolet Tahoe 2WD V8-4.8L VIN VSECTION Section 4
4. Retrieving Engine Calibration ID and Verification No. (Number) Information Using the Tech 2 - This Action is Required for ALL Service Agents (Model Dependent)
Notice:
This information applies to vehicles that are Tech 2 compatible and is typical of the procedure that will be used.
1. Connect the Tech 2 to the vehicle.
2. Go to: Diagnostics and build the vehicle.
3. Select: Powertrain.
4. Select: Engine.
5. Select: Engine Control Module or PCM.
6. Select: Module ID Information or I/M Information System if the Module ID Information selection is not available.
7. *If "I/M information System" was selected, it may be necessary to select "Vehicle Information" in order to display the calibration information.
^ If the CVN information is displayed as "N/A", it will be necessary to contact the TCSC to obtain the CVN information.
^ If the CVN Information is displayed as all zeroes, refer to Section: 5. Tech 2 Displaying All Zeroes for the Verification Numbers on the Vehicle Information - Calibration ID and Verification No. (Number/CVN) Screen
Notice:
^ Two examples of the Tech 2 Vehicle Information - (Engine) Calibration ID and Verification No. screens are shown.
^ The Tech 2(R) Vehicle Information - Calibration ID and Verification No. screen will differ slightly depending on vehicle and model year.
Take a CLEAR digital picture(s) of the Tech 2 Vehicle Information screen showing the entire VIN, (Engine) Calibration ID and Verification No. (Number/CVN) and save it in .jpg format.
Notice:
It is recommended that an electronic copy of the Tech 2 screen photograph(s) also be saved.
8. Retain the printout information and the Tech 2 screen photograph(s) with the repair order.
Notice:
This information applies to vehicles that are Tech 2 compatible and is typical of the procedure that will be used.
1. Connect the Tech 2 to the vehicle.
2. Go to: Diagnostics and build the vehicle.
3. Select: Powertrain.
4. Select: Engine.
5. Select: Engine Control Module or PCM.
6. Select: Module ID Information or I/M Information System if the Module ID Information selection is not available.
7. *If "I/M information System" was selected, it may be necessary to select "Vehicle Information" in order to display the calibration information.
^ If the CVN information is displayed as "N/A", it will be necessary to contact the TCSC to obtain the CVN information.
^ If the CVN Information is displayed as all zeroes, refer to Section: 5. Tech 2 Displaying All Zeroes for the Verification Numbers on the Vehicle Information - Calibration ID and Verification No. (Number/CVN) Screen
Notice:
^ Two examples of the Tech 2 Vehicle Information - (Engine) Calibration ID and Verification No. screens are shown.
^ The Tech 2(R) Vehicle Information - Calibration ID and Verification No. screen will differ slightly depending on vehicle and model year.
Take a CLEAR digital picture(s) of the Tech 2 Vehicle Information screen showing the entire VIN, (Engine) Calibration ID and Verification No. (Number/CVN) and save it in .jpg format.
Notice:
It is recommended that an electronic copy of the Tech 2 screen photograph(s) also be saved.
8. Retain the printout information and the Tech 2 screen photograph(s) with the repair order.
RENDER: 1.0x
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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.