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DTC C0550 Circuit Description At each power-up the transfer case shift control module runs a self-test on the following EEPROM Checksum ROM Checksum RAM Checksum RAM Malfunction DTC Descriptor This diagnostic procedure supports the following DTC: DTC C0550 ECU Malfunction Conditions for Running the DTC The ignition is ON. The system voltage is 9-18 volts. Conditions for Setting the DTC Critical operational parameters stored in EEPROM have failed Checksum test indicating Masked ROM code has failed Checksum test indicating that masked ROM data is not ROM code has failed Checksum test indicating that ROM data is not currently valid. Did you complete the repair? Go to Step 8 8 1. Use the scan tool in order to clear the DTCs. 2. Operate the vehicle within the Conditions for Running the Does the DTC reset? - Go to Step 2 System OK
2007 Hummer H3 2007 TRANSMISSION Transfer Case - BW 4493/4494 - H3
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