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 HighDTC P0563: System Voltage Low
Circuit/System Description
The transmission control module (TCM) continuously monitors the system voltage on the Ignition 1 voltage circuits. Lower than normal voltage may be inadequate to operate the transmission control solenoids properly. Improper solenoid operation may cause erratic transmission operation, which may result in internal damage.
Conditions for Running the DTC
P0562
| • | Ignition voltage has been greater than 12 volts for 1 second this ignition cycle. |
| • | Engine speed is 1200 RPM or greater. |
P0563
Ignition voltage has been greater than 12 volts for 1 second this ignition cycle.
Conditions for Setting the DTC
P0562
The TCM detects system voltage is 11.0 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
| • | Observe the driver information center (DIC) messaging that indicates the electrical system requires service. |
| • | Inspect for the following conditions: |
| - | Loose or damaged terminals at the generator |
| - | Loose or worn generator drive belt |
Reference Information
Schematic Reference
Automatic Transmission Controls Schematics
Connector End View Reference
Electrical Information Reference
Scan Tool Reference
Control Module References for scan tool information
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Circuit/System Verification
Engine ON, measure and record the battery voltage with a DMM. The battery voltage should be between 12.5-14.5 volts. If the voltage is not within the specified value, or the charge indicator light is ON, refer to Charging System Test .
Circuit/System Testing
Engine ON, the scan tool Ignition voltage parameter should display between 12.5-14.5 volts. If the voltage is not within the specified value, test the ignition voltage circuit for an open circuit or short to ground.
Repair Instructions
Important: Always perform the Diagnostic Repair Verification after completing the diagnostic procedure.
Perform the Service Fast Learn Adapts.
