Some 2007-2009 B2300 49 State/Federal Specification vehicles equipped with automatic transmissions may exhibit higher than expected engine idle speeds of 1,500-2,400 rpm at cold start up. A new Powertrain Control Module (PCM) calibration has been developed to correct this condition.
Customers having this concern should have their vehicle repaired using the following repair procedure.
(Use Steps below for all models)
1. Reboot the IDS to clear memory before reprogramming.
2. Using IDS 61.17 or higher or 62.05 or higher software, reprogram the PCM to the latest calibration (refer to “Calibration Information” table) by following the “Module Reprogramming” procedure.
This new calibration is not included in the VCM 2009.7 DVD.
• This bulletin does not apply to California Spec. vehicles.
• Always update the IDS tool first, then follow on-screen instructions to download the needed calibration file for PCM reprogramming.
• It is not necessary to remove any fuses or relays during PCM reprogramming when the IDS screen prompts you to do so. You may accidentally stop power to one of the PCM terminals and cause the PCM to be blanked, or you may receive error messages during the IDS reprogramming procedure.
• IDS shows the calibration part numbers after programming the PCM.
• Please be aware that PCM calibration part numbers and file names listed in any Service Bulletin may change due to future releases of IDS software, and additional revisions made to those calibrations for service related concerns.
• When reprogramming a PCM, IDS will always display the “latest” calibration P/N available for that vehicle. If any calibration has been revised/updated to contain new information for a new service concern/issue, it also will contain all previously released calibrations.
When performing this procedure, we recommend that a battery charger be installed on the vehicle battery and turned ON to a maximum charge of no more than 20 amps to keep the vehicle battery up to capacity. If you exceed 20 amps, it could damage the VCM.