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Service Procedure

Service Procedure





- If the vehicle is a TopKick or Kodiak reprogram only the ECM. Refer to ECM Programming Instructions in this bulletin.
- If the vehicle is a Silverado or Sierra equipped with RPO YF2, reprogram only the ECM. Refer to ECM Programming Instructions in this bulletin.
- If the vehicle is an Express or Savana and NOT equipped with RPO code ANC or RPO YF2, reprogram only the ECM. Refer to ECM Programming Instructions in this bulletin.
- If the vehicle is an Express or Savana equipped with RPO code ANC or RPO YF2, reprogram the engine control module (ECM) and then the transmission control module (TCM). Refer to ECM Programming Instructions in this bulletin. Refer to TCM Programming Instructions in this bulletin. Note that RPO ANC did not exist for 2007 model year Express or Savana vans, so if the vehicle is a 2007 model year and built as a shuttle you will need to reprogram the TCM.
- Refer to the Claim section of this bulletin for the labor operation code and time for programming the ECM, or ECM and TCM.

ECM PROGRAMMING INSTRUCTIONS

A new engine operation calibration titled, Engine Calibration Update to Address Frequent Occurrences of DTC P0401 is available. Programming of the TCM is NOT required unless the vehicle is an Express or Savana van equipped with RPO code ANC or YF2.

Do not attempt to order the calibration number from GMSPO. The calibration numbers required for this service procedure are programmed into control modules via a Multiple Diagnostic Interface (MDI) and TIS2WEB with the calibration update. Use TIS2WEB on or after 10/28/09 to obtain the calibration. If you cannot access the calibration, call the Techline Customer Support Center and it will be provided.

For step-by-step programming instructions, please refer to SI and the Techline Information System (TIS) terminal.

1. Verify that there is a battery charge of 12 to 16 volts. The battery must be able to maintain a charge during programming. Only use an approved Midtronic 165-PSC charger to maintain proper battery voltage during programming.
2. Reprogram the engine control module (ECM). Refer to SI and Service Programming System (SPS) documentation for programming instructions, if required.

1. Connect the MDI to the vehicle.
2. Select J2534 MDI and Reprogram ECU from the Select Diagnostic Tool and Programming Process screen.
3. Select ECM Engine Control Module - Programming from the Supported Controllers screen. Refer to SI and Service Programming System (SPS) documentation for programming instructions, if required.
4. Follow the on-screen instructions.

3. Using the MDI, and GDS or Tech 2, clear all DTCs if required.

TCM PROGRAMMING INSTRUCTIONS (Express and Savana Only)

Do not attempt to order the calibration number from GMSPO. The calibration numbers required for this service procedure are programmed into control modules via a Multiple Diagnostic Interface (MDI) and TIS2WEB with the calibration update. Use TIS2WEB on or after 10/28/09 to obtain the calibration. If you cannot access the calibration, call the Techline Customer Support Center and it will be provided.

For step-by-step programming instructions, please refer to SI and the Techline Information System (TIS) terminal.

1. Verify that there is a battery charge of 12 to 16 volts. The battery must be able to maintain a charge during programming. Only use an approved Midtronic 165-PSC charger to maintain proper battery voltage during programming.
2. Reprogram the engine control module (ECM). Refer to SI and Service Programming System (SPS) documentation for programming instructions, if required.

1. Connect the MDI to the vehicle.
2. Select J2534 MDI and Reprogram ECU from the Select Diagnostic Tool and Programming Process screen.
3. Select TCM Transmission Control Module - Programming from the Supported Controllers screen. Refer to SI and Service Programming System (SPS) documentation for programming instructions, if required.
4. Follow the on-screen instructions. Refer to TCM Calibration Information in this bulletin.

3. Using the MDI, and GDS or Tech 2, clear all DTCs if required.

TCM CALIBRATION INFORMATION (Express and Savana Only)

TCM calibrations on shuttle buses and ambulance packages will also have to be updated when the ECM is updated with the P0401 calibration. NOTE: RPO ANC did not exist on 2007 model year Express or Savana vans, so if the vehicle has been converted to a shuttle you need to refer to the part numbers listed below. If a 2007, 2008, or 2009 model year Express or Savana was not ordered with RPO ANC or YF2 but converted to a shuttle or ambulance after production, you will need to call Techline for assistance. Below is the calibration information for shuttle buses (RPO ANC) and ambulances (RPO YF2). If the calibrations are not found in TIS2WEB, please contact the Techline Customer Support Center.

1. 2007 Model Year

- Engine diagnostic calibration part numbers

- 12632400 for single generator equipped vans
- 12632401 for dual generator equipped vans

- Engine operation calibration part number: 12632399
- Transmission calibration part number: 24252538

2. 2008 Model Year

- Engine diagnostic calibration part numbers:

- 12632403 for single generator equipped vans
- 12632404 for dual generator equipped vans

- Engine operation calibration part number: 12632402
- Transmission calibration part number: 24252539

3. 2009 Model Year

- Engine diagnostic calibration part numbers:

- 12632386 for single generator (less than 14,000 GVWR Gross Vehicle Weight Rating)
- 12632387 for single generator (greater than 14,000 GVWR)
- 12632384 for dual generator (less than 14,000 GVWR)
- 12632385 for dual generator (greater than 14,000 GVWR)

- Engine Operation calibration part number: 12632383
- Transmission calibration part number: 24252531

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