6T70/6T75 - 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 Descriptors
DTC P0562
- System Voltage Low
DTC P0563
- System Voltage High
Circuit/System Description
The transmission control module (TCM) within the control solenoid (w/body and TCM) valve assembly continuously monitors the system voltage on the ignition voltage circuit.
Conditions for Running the DTC
P0562
* Ignition voltage is between 8.6 volts and 19.0 volts.
* Engine speed is 1200 RPM or greater.
P0563
Ignition voltage is between 8.6 volts and 19.0 volts.
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
* Observe the driver information center (DIC) messaging that would indicate 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 (Electrical 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
Special Tools
DT-47825-20 Adapter Harness
Circuit/System Verification
1. Engine running, accessories OFF, measure and record the battery voltage at the battery terminals. The voltage should be between 12.6-15.0 volts.
• If not within the specified range, refer to Charging System Test (Acadia or Enclave) Charging System Test (OUTLOOK) .
2. Observe the scan tool TCM Ignition Voltage parameter. The reading should be between 12.6-15.0 volts.
3. 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. Ignition OFF, disconnect the 20-way harness connector at the transmission.
2. Connect the DT-47825-20 to the 20-way transmission harness connector.
3. Test for less than 10 ohms of resistance between the ground circuit terminals listed below and ground.
* Terminal 1
* Terminal 18
• If greater than the specified range, test the ground circuit for an open/high resistance.
4. Ignition ON, verify that a test lamp illuminates between the ignition circuit terminal 13 and ground.
• If the test lamp does not illuminate, test the ignition circuit for a short to ground or an open/high resistance.
5. If all circuits test normal, replace the control solenoid (w/body and TCM) valve assembly.
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
Important:
* Perform the Service Fast Learn Adapts (Programming and Relearning) following all transmission related repairs.
* Before replacing the TCM, perform the Control Solenoid Valve and Transmission Control Module Assembly Inspection (Control Solenoid Valve and Transmission Control Module Assembly Inspection) .
Refer to Control Module References for control solenoid (w/body and TCM) valve assembly replacement, setup, and programming.