P0562
DTC P0562 or P0563
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 Descriptors
DTC P0562
- System Voltage Low
DTC P0563
- System Voltage High
Diagnostic Fault Information
Typical Scan Tool Data
Circuit/System Description
The transmission control module (TCM) continuously monitors the system voltage on the ignition voltage circuit.
Conditions for Running the DTC
P0562
The engine speed is 1,200 RPM or greater for 5 seconds.
P0563
The ignition is ON.
Conditions for Setting the DTC
P0562
The TCM detects system voltage is 11 volts or less for 10 seconds.
P0563
The TCM detects system voltage is 18 volts or greater for 10 seconds.
Action Taken When the DTC Sets
DTCs P0562 and P0563 are type C DTCs.
Conditions for Clearing the DTC
DTCs P0562 and P0563 are type C DTCs.
Diagnostic Aids
1. Observe the driver information center (DIC) messaging that would indicate the electrical system requires service.
2. Inspect for loose or damaged terminals at the generator.
3. Inspect for loose or worn generator drive belt.
4. Use the scan tool in order to inspect all other modules for voltage related DTCs.
5. Running the engine with a battery charger attached may cause DTC P0563 to set.
6. Inspect the charging circuit for high resistance.
7. Inspect the vehicle battery for open or sulfated cells.
Reference Information
Schematic Reference
Automatic Transmission Controls Schematics (Diagrams)
Connector End View Reference
Component Connector End Views
Electrical Information Reference
* Circuit Testing
* Connector Repairs
* Testing for Intermittent Conditions and Poor Connections
* Wiring Repairs
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Verification
1. Engine running, accessories OFF, measure and record the battery voltage at the battery terminals. The voltage should be between 12 and 14.5 volts.
• If not within the specified range, refer to Charging System Test .
2. Observe the scan tool TCM Ignition Voltage parameter. The reading should be between 12 and 14.5 volts.
Operate the vehicle within the Conditions for Running the DTC to verify the DTC does not reset. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.
Circuit/System Testing
1. Start the engine and observe the Ignition Voltage parameter with a scan tool. The Ignition Voltage parameter should be between 12-14.5 volts.
• If the voltage is not within the specified range, refer to Charging System Test .
2. Increase the engine speed to 1,500 RPM. The Ignition Voltage parameter should remain between 12-14.5 volts.
• If the voltage is not within the specified range when the engine speed is increased, refer to Charging System Test .
3. Turn OFF the ignition. Disconnect the TCM connector. Probe the battery positive voltage and the ignition 1 voltage circuits of the TCM connector with the ground probe of the DMM. Connect the positive lead of the DMM to the battery positive terminal. Turn ON the ignition, with the engine OFF. Measure the voltage drop for each circuit. The voltage drop should be less than 0.5 volts.
• If the voltage drop is greater than 0.5 volts, repair the high resistance in the affected circuit.
4. Turn OFF the ignition. Using the positive probe of the DMM, probe the ground circuits of the TCM connector. Connect the negative lead of the DMM to the battery ground terminal. Observe and record the voltage measurements. The voltage drop should be less than 0.2 volts.
• If the voltage drop is greater than 0.2 volts, repair the open or high resistance in the affected circuit.
• If all circuits and connections test normal, replace the TCM.
Repair Instructions
Perform the Diagnostic Repair Verification after completing the repair.
Control Module References for TCM replacement, setup, and programming.