For 1990-2009 cars only
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 P0563 : System Voltage HighDiagnostic Fault Information
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
IGN / B+ | P0562 | P0562 | -- | -- |
Ground | -- | P0562 | -- | -- |
Circuit/System Description
The engine control module (ECM) monitors the system voltage to ensure that the voltage stays within the proper range. Damage to components, and incorrect data may occur when the voltage is out of range.
Conditions for Running the DTC
| • | The vehicle speed is above 8 km/h (5 mph). |
| • | The system voltage is between 9.5-18 volts. |
Conditions for Setting the DTC
The ECM detects a system voltage above 16 volts for less than 1 second.
Action Taken When the DTC Sets
| • | The instrument panel cluster (IPC) illuminates the charge indicator. |
| • | The driver information center (DIC) displays the CHARGING SYSTEM / GENERATOR FAULT warning message. |
Conditions for Clearing the DTC
DTC P0563 is a C type DTC.
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. |
Reference Information
Schematic Reference
| • | Engine Controls Schematics for the 3.6L engine. |
| • | Engine Controls Schematics for the 5.3L engine. |
Connector End View Reference
Description and Operation
Charging System Description and Operation
Electrical Information Reference
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Verification
- Engine running, accessories OFF, measure and record the voltage at the battery voltage at the battery terminals. The voltage should be between 12.6 and 15.5 volts.
- Observe the scan tool ECM Ignition 1 Signal parameter. The reading should be between 12.6 and 15.5 volts.
| ⇒ | If not within the specified range, refer to Charging System Test |
| ⇒ | If not within the specified range , replace the ECM. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
Control Module References for ECM replacement, setup, and programming.
