Normal Operation

With the engine running, the charging system supplies voltage to the battery and the vehicle electrical system through the battery B+ cable. The voltage that is supplied to the vehicle electrical system is used for the operation of the various vehicle systems and modules. Many modules monitor this voltage and if it rises above a calibrated set point, this DTC sets.

• DTC B1317 Battery Voltage High - Each module within the vehicle system monitors input voltage to the module. If the voltage rises above the module's calibrated set point (which varies by module), that module sets this DTC. This DTC may also be in memory as a Continuous Memory Diagnostic Trouble Code (CMDTC) if the vehicle has been recently jump started or has had a discharged battery.
• DTC B1676 Battery Pack Voltage Out of Range - Each module within the vehicle system monitors input voltage to the module. If the voltage rises above or drops below the modules calibrated set point, that module sets this DTC. This DTC may also be in memory (CMDTC) if the vehicle has been recently jump started or has had a discharged battery.
• DTC P0563 System Voltage High - If the module detects a voltage from the charging system higher than 15.2 volts, this DTC sets. This DTC does not set in the PCM unless vehicle speed is above 8 km/h (5 mph).

This pinpoint test is intended to diagnose the following: 

• Fuses
• Wiring, terminals or connectors
• Engine, generator and battery grounds
• Battery
• Generator
• PCM