Diagnostic Instructions
| • | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. |
| • | Review Strategy Based Diagnosis for an overview of the diagnostic approach. |
| • | Diagnostic Procedure Instructions provides an overview of each diagnostic category. |
DTC Descriptor
DTC B1328: Device Voltage Circuit HighDiagnostic Fault Information
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
B+ | B1327 | B1327 | -- | -- |
Ground | -- | B1327 | -- | -- |
Circuit/System Description
The control modules on this vehicle monitor system voltage through the battery positive voltage circuits. Damage to components, and incorrect data can occur when the voltage is out of range. This vehicle has multiple modules that will set this DTC. For more information on which modules, refer Diagnostic Trouble Code (DTC) List - Vehicle
Conditions for Running the DTC
| • | This DTC shall run only if the module has power, ground and the ignition is not in START mode. |
| • | This DTC shall execute regardless of the battery voltage. |
Conditions for Setting the DTC
This DTC shall be set as current when the voltage raises above 16 volts for 1.2 seconds.
Action Taken When the DTC Sets
| • | A message shall be sent out to notify all other modules of high battery voltage. |
| • | The modules disable the setting of U codes and other DTCs. |
Conditions for Clearing the DTC
| • | The DTC will clear current status when the voltage is less than 15.5 volts for 1.2 seconds. |
| • | A history DTC will clear after 50 consecutive ignition cycles if the condition for the malfunction is no longer present. |
Reference Information
Schematic Reference
Connector End View Reference
Description and Operation
Charging System Description and Operation
Electrical Information Reference
Scan Tool Reference
Control Module References for scan tool information.
Diagnostic Aids
| • | A possible cause of this DTC could be overcharging with a battery charger or jump starting. |
| • | A high voltage value in multiple modules indicates a concern in the charging system. |
Circuit/System Verification
- Engine running measure and record the voltage at the battery terminals.The battery voltage is 12.6-15.5 volts.
- Observe the appropriate module scan tool Battery Positive Voltage parameter. The reading should be between 12.6 and 15.5 volts.
| ⇒ | If the battery voltage is not within the specified range, refer to Charging System Test. |
| ⇒ | If not within the specified range, replace the appropriate module. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
Control Module References for the affected module replacement, setup and programming.
