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.
Section 2
2012 Chevrolet Express 3500 V8-4.8LSECTION Section 2
2. Overview of Calibration Retrieval and Calibration Verification Procedure for Service Agents NOT REQUIRED to Call PQC for Powertrain/Drivetrain Assembly Replacement Authorization
Notice:
^ The Service Agent Service Department Personnel is NOT REQUIRED TO E-MAIL TAC the digital Calibration Verification photos from the Tech 2 screen or GDS 2 screen shot, UNLESS non-GM calibrations are found.
^ The Service Agent Service Department Personnel is REQUIRED TO RETAIN ALL of the related documentation showing the Calibration Information was Retrieved and the Calibration Verification Procedure was completed, in the Service Agent Vehicle History Service File.
1. Depending on the vehicle being serviced, the Service Department Personnel is required to complete one of the following procedures, either Step 1.1 or Step 1.2 in order to ensure that there are not any non-GM engine control module calibrations present:
1. Section 4. Retrieving Engine Calibration ID and Verification No. (Number) Information Using the Tech 2 After retrieving the calibration information, Go to Step 2.
OR
2. Section 6. Retrieving Calibration Information From Global A Vehicles Using GDS 2 After retrieving the calibration information, Go to Step 2.
2. After retrieving the Calibration Information and performing Section: 8. Calibration Verification Procedure - For Service Agents NOT REQUIRED to Call PQC for Powertrain/Drivetrain Assembly Replacement Authorization - Using the Tech 2 or GDS 2 the Service Department personnel is required to retain all of the related documentation showing the procedures were completed in the Service Agent Vehicle History Service File.
^ If the Calibration Verification Procedure determines that THERE ARE non-GM engine control module calibrations present, the Service Department Personnel MUST follow the procedure as instructed in Section: 10. Procedure for All Service Agents for E-mailing .jpg or JPEG Files to the Calibration Group at - TACCVN@gmexpert.com
3. When returning an engine assembly a printed copy of the Tech 2 Vehicle Information - Engine Calibration ID and Verification No. (Number/CVN) screen or the GDS 2 Calibration History (Events) screen shot must be attached to the documentation being returned with the unit.
Notice:
For additional information regarding: Service Agents NOT Required to Call PQC for Powertrain/Drivetrain Assembly Replacement Authorization, refer to the latest version of Corporate Bulletin # 12-07-30-001 Information for Service Agents Not Required to Contact Product Quality Center (PQC) for CNG, LPG or Gasoline Engine, Transmission and/or Transfer Case Replacement Authorization
Notice:
^ The Service Agent Service Department Personnel is NOT REQUIRED TO E-MAIL TAC the digital Calibration Verification photos from the Tech 2 screen or GDS 2 screen shot, UNLESS non-GM calibrations are found.
^ The Service Agent Service Department Personnel is REQUIRED TO RETAIN ALL of the related documentation showing the Calibration Information was Retrieved and the Calibration Verification Procedure was completed, in the Service Agent Vehicle History Service File.
1. Depending on the vehicle being serviced, the Service Department Personnel is required to complete one of the following procedures, either Step 1.1 or Step 1.2 in order to ensure that there are not any non-GM engine control module calibrations present:
1. Section 4. Retrieving Engine Calibration ID and Verification No. (Number) Information Using the Tech 2 After retrieving the calibration information, Go to Step 2.
OR
2. Section 6. Retrieving Calibration Information From Global A Vehicles Using GDS 2 After retrieving the calibration information, Go to Step 2.
2. After retrieving the Calibration Information and performing Section: 8. Calibration Verification Procedure - For Service Agents NOT REQUIRED to Call PQC for Powertrain/Drivetrain Assembly Replacement Authorization - Using the Tech 2 or GDS 2 the Service Department personnel is required to retain all of the related documentation showing the procedures were completed in the Service Agent Vehicle History Service File.
^ If the Calibration Verification Procedure determines that THERE ARE non-GM engine control module calibrations present, the Service Department Personnel MUST follow the procedure as instructed in Section: 10. Procedure for All Service Agents for E-mailing .jpg or JPEG Files to the Calibration Group at - TACCVN@gmexpert.com
3. When returning an engine assembly a printed copy of the Tech 2 Vehicle Information - Engine Calibration ID and Verification No. (Number/CVN) screen or the GDS 2 Calibration History (Events) screen shot must be attached to the documentation being returned with the unit.
Notice:
For additional information regarding: Service Agents NOT Required to Call PQC for Powertrain/Drivetrain Assembly Replacement Authorization, refer to the latest version of Corporate Bulletin # 12-07-30-001 Information for Service Agents Not Required to Contact Product Quality Center (PQC) for CNG, LPG or Gasoline Engine, Transmission and/or Transfer Case Replacement Authorization
RENDER: 1.0x
NO RELATED
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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.