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To correct this condition, the ECM should be reprogrammed using the GDS download as described
in this bulletin.
Service Procedure
UPGRADE EVENT NAME
NOTICE
^ A fully charged battery is necessary before ECU upgrade can take place. DO NOT connect a
battery charger to the vehicle during ECU upgrade. Make
sure the blower motor is "OFF" during ECU upgrade.
^ All ECU upgrades must be done with the ignition key in the "ON" position.
^ Be careful not to disconnect any cables connected to the vehicle or GDS during the ECU upgrade
procedure.
^ DO NOT start the engine during ECU upgrade.
^ DO NOT turn the ignition key "OFF" or interrupt the power supply during ECU upgrade.
^ When the ECU upgrade is completed, turn the ignition key "OFF" and wait 20 seconds before
starting the engine.
^ ONLY use approved ECU upgrade software designated for the correct model, year and engine
size. Failure to do so may create other driveability
issues due to the use of the incorrect ECM/PCM calibration.
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