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DIAGNOSTIC TROUBLE CODE LIST Diagnostic Trouble Code List DIAGNOSTIC TESTS DTC B1327 Circuit Description All vehicle modules monitor system voltage. The system voltage message is sent to other modules via Class 2 Conditions For Running DTC This DTC shall run only if the module has power, ground and the ignition is not in START mode. This DTC Conditions For Setting DTC z This DTC shall be set as current when the voltage falls below 9.0 volts for 1.2 seconds. z When the vehicle exits START the module shall delay checking the voltage for 2 seconds. Action Taken When DTC Sets z A message shall be sent out on the class 2 lines to notify all other modules of low battery voltage. z The modules disable the setting of U codes and other DTCs. Conditions For Clearing DTC z The DTC will clear current status when the voltage is greater than 9.5 volts for 1.2 seconds. z A history DTC will clear after 50 consecutive ignition cycles if the condition for the malfunction is no z Use the ON-Board clearing DTCs feature. z Use a scan tool. DTC Module(s) B1327 BCM B1328 BCM P0562 PCM P0563 PCM P0615 PCM P1637 PCM
2004 Hummer H2 2004 STARTING & CHARGING SYSTEMS Starters - H2
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