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 P0562: System Voltage LowDiagnostic Fault Information
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
IGN I | 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 9.5-18.0 volts. |
Conditions for Setting the DTC
The ECM detects a system voltage below 10 volts for 5 seconds.
Action Taken When the DTC Sets
| • | The instrument panel cluster (IPC) illuminates the charge indicator. |
| • | The driver information center (DIC) displays the SERVICE BATTERY CHARGING SYSTEM warning message. |
Conditions for Clearing the DTC
DTC P0562 is a C type DTC.
Diagnostic Aids
A low voltage DTC in multiple modules indicates a concern in the charging system.
Reference Information
Schematic Reference
| • | Engine Controls Schematics for the 3.5L engine |
| • | Engine Controls Schematics for the 3.9L 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 measure and record the voltage at the battery terminals. Verify that the battery voltage is 12.6-15.5 volts.
- Observe the scan tool ECM Ignition 1 Signal 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. |
Circuit/System Testing
- Ignition OFF, disconnect the harness connectors at the ECM.
- Ignition OFF and scan tool disconnected, open and close the driver door, and wait 1 minute. Test for less than 5 ohms between the ground circuit terminals lisred below and ground.
- Ignition ON, verify that a test lamp illuminates between the ignition circuit terminals listed below and ground.
- If all the circuits test normal, replace the ECM.
| • | 3.5L Terminal 73 X1 |
| • | 3.9L Terminal 73 X1 |
| • | 5.3L Terminal 73 X2 |
| ⇒ | If greater than the specified range, test the ground circuit for an open/high resistance. |
| • | 3.5L Terminal 19 X1 |
| • | 3.5L Terminal 47 X1 |
| • | 3.9L Terminal 19 X1 |
| • | 3.9L Terminal 47 X1 |
| • | 5.3L Terminal 19 X1 |
| • | 5.3L Terminal 13 X2 |
| ⇒ | If the test lamp did not illuminate , test the Ignition circuits for a short to ground or an open/high resistance. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
Control Module References for ECM replacement, setup, and programming
