• | 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. |
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
---|---|---|---|---|
IGN I | P0562 | P0562 | -- | -- |
Ground | -- | P0562 | -- | -- |
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.
• | The vehicle speed is above 8 km/h (5 mph). |
• | The system voltage is between 9.5-18 V. |
The ECM detects a system voltage above 16 V.
DTC P0563 is a C type DTC.
DTC P0563 is a C type DTC.
• | 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. |
• | Engine Controls Schematics for the 4.3L engine. |
• | Engine Controls Schematics for V8 gas engines. |
• | Engine Controls Schematics for the 6.6L engine. |
Charging System Description and Operation
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Control Module References for scan tool information
⇒ | If the battery voltage is not within the specified range, refer to Charging System Test. |
⇒ | If greater than specified value, replace the ECM. |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
Control Module References for ECM replacement, setup, and programming.
• | 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. |
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
---|---|---|---|---|
B+ | P0562 | P0562 | -- | -- |
Ground | -- | P0562 | -- | -- |
The fuel pump control module (FPCM) 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. If the FPCM detects that the system voltage is high, DTC P0563 sets.
The ignition is ON.
The FPCM detects that the system voltage is greater than 18 V.
DTC P0563 is a type C DTC.
DTC P0563 is a type C DTC.
• | A high voltage DTC in multiple modules indicates a concern in the charging system. |
• | This DTC could be set by overcharging with a battery charger or jump starting. |
Charging System Description and Operation
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Control Module References for scan tool information
⇒ | If not within the specified range, refer to Charging System Test. |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
Control Module References for FPCM replacement, setup, and programming.