4L80-E/4L85-E - 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 provide 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 and the battery voltage circuits. Lower than normal or higher than normal voltage may not operate the transmission control solenoids properly. Improper solenoid operation may cause erratic transmission operation and may result in internal transmission damage.


Conditions for Running the DTC

P0562

The engine speed is 1,200 RPM for greater than 5 seconds.

P0563

The ignition is ON.


Conditions for Setting the DTC

P0562

The TCM detects system voltage of 11-volts or less for 10 seconds.

P0563

The TCM detects system voltage of 18-volts or greater for 10 seconds.


Action Taken When the DTC Sets

DTC P0562 and P0563 are type C DTCs.


Conditions for Clearing the DTC

DTC P0562 and P0563 are type C DTCs.


Reference Information
Schematic Reference

Automatic Transmission Controls Schematics (6.6L) (Electrical Diagrams)Automatic Transmission Controls Schematics (4.8L and 6.0L) (Electrical Diagrams)
Connector End View Reference

Component Connector End Views
Description and Operation

Transmission General Description (Transmission General Description)
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

Ignition ON, observe the Ignition 1 Signal parameter with the scan tool. The Ignition 1 Signal parameter should read between 12.0-14.5-volts.


Circuit/System Testing

1. Measure the voltage at the battery terminals and compare it with the Ignition 1 Signal parameter on the scan tool. Verify that battery and Ignition 1 signal readings do not differ greater than 1.0 volt.

• If greater than 1.0 volt, test the TCM ignition 1 and ground circuits for high resistance. If the circuits test normal, replace the TCM.

2. Refer to Charging System Test .



Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.


Control Module References for TCM replacement, setup, and programming.