M99 - Automatic Transmission

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 Descriptor
DTC P0562
- System Voltage High

DTC P0563
- System Voltage Low




Circuit/System Description

The transmission control module (TCM) continuously monitors the system voltage on the Ignition voltage circuits. The TCM is located within the control solenoid (w/body and TCM) valve assembly and is not serviced separately. 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


DTC P0562
* Ignition voltage has been greater than 12 volts for 1 second this ignition cycle.
* Engine speed is 1200 RPM or greater.


DTC P0563

Ignition voltage has been greater than 12 volts for 1 second this ignition cycle.


Conditions for Setting the DTC

DTC P0562

The TCM detects system voltage is 10 volts or less for 10 seconds.

DTC 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 would indicate the electrical system requires service.
* Inspect for the following conditions:

- Loose or damaged battery terminals
- Loose or corroded connections at the transmission
- Loose or corroded connections at the accessory power module (APM)




Reference Information
Schematic Reference

* Automatic Transmission Controls Schematics (Electrical Diagrams)
* Hybrid Controls Schematics

Connector End View Reference

Component Connector End Views
Electrical Information Reference

* Circuit Testing
* Connector Repairs
* Testing for Intermittent Conditions and Poor Connections
* Wiring Repairs
* High Voltage Disabling
* High Voltage Enabling

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference

* Scan Tool Output Controls (Scan Tool Output Controls)
* Scan Tool Data List (Scan Tool Data List)
* Scan Tool Data Definitions (Scan Tool Data 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, go 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.


If the voltage is within the specified range, replace the control solenoid (w/body and TCM) valve assembly.



Component Testing

* Perform the Fluid Leak Diagnosis (Fluid Leak Diagnosis) .
* Perform the Transmission Fluid Check (Transmission Fluid Check) procedure.
* Perform the Line Pressure Check (Line Pressure Check) procedure.
* Perform the High or Low Line Pressure Check.



Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.


Control solenoid (w/body and TCM) valve assembly replacement. Refer to Control Module References for replacement, setup, and programming.