B1328

DTC B1328

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (Initial Inspection and Diagnostic Overview) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (Initial Inspection and Diagnostic Overview) for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions (Initial Inspection and Diagnostic Overview) provides an overview of each diagnostic category.



DTC Descriptor
DTC B1328
- Device Voltage Circuit High




Diagnostic Fault Information






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 (Diagnostic Trouble Code Descriptions)


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

Control Module References (Programming and Relearning)
Connector End View Reference

Component Connector End Views (Connector Views)
Description and Operation

Charging System Description and Operation (Description and Operation)
Electrical Information Reference

* Circuit Testing (Component Tests and General Diagnostics)
* Connector Repairs (Component Tests and General Diagnostics)
* Testing for Intermittent Conditions and Poor Connections (Component Tests and General Diagnostics)
* Wiring Repairs (Component Tests and General Diagnostics)

Scan Tool Reference

Control Module References (Programming and Relearning) 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

1. Verify DTC B1328 is set as current.

• If the DTC is history, refer to Charging System Test (Charging System Test).

2. Start the engine, record the voltage at the battery terminals. Observe the affected module scan tool Battery Positive Voltage parameter. Voltages should not differ by more than 2 volts

• If not within the specified range, replace the affected module.




Repair Instructions

Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.


Control Module References (Programming and Relearning) for the affected module replacement, setup and programming.