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6L50/6L80/6L90 - Automatic Transmission




DTC P0562 or P0563

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis Strategy Based Diagnosis for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions 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






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. Theses DTC detects high or low TCM voltage for an extended period.

Conditions for Running the DTC

DTC P0562
* Ignition voltage is 6 volts or greater and has not drop below 2 volts.
* Engine speed is 1200 RPM or greater.

DTC P0563

Ignition voltage is 6 volts or greater and has not drop below 2 volts.

Conditions for Setting the DTC

DTC P0562

The TCM detects system voltage is less than 8.6 volts for 12 seconds.

DTC P0563

The TCM detects system voltage is 18 volts or greater for 12 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.

Reference Information
Schematic Reference

Automatic Transmission Controls Schematics Electrical Diagrams
Connector End View Reference

* Component Connector End Views Connector Views
* Inline Harness Connector End Views X101

Description and Operation

* Transmission General Description Transmission General Description
* Transmission Component and System Description Transmission Component and System Description
* Electronic Component Description Electronic Component Description

Electrical Information Reference

* Circuit Testing Circuit Testing
* Connector Repairs Connector Repairs
* Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections
* Wiring Repairs Wiring Repairs

DTC Type Reference

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

Control Module References Control Module References for scan tool information
Special Tools

DT-47825-10 - Jumper Harness

For equivalent regional tools, refer to Special Tools Tools and Equipment.

Circuit/System Verification

1. Engine Running, accessories OFF, measure and record the battery voltage with a DMM. The battery voltage should be between 12.6-15 volts.

If not between 12.6-15 volts
Refer to Charging System Test Testing and Inspection.

If between 12.6-15 volts

2. Observe the scan tool TCM ignition voltage parameter. Theparameter value should be between 12.6-15 volts.

If not between 12.6-15 volts
Refer to Circuit/System Testing below.

If between 12.6-15 volts

3. After performing the above steps, verify that the DTC does not reset by operating the vehicle within the conditions for running the DTC. You may also operate the vehicle within the conditions you observe from the Freeze Frame/Failure Records data. If the vehicle passes the Circuit/System Verification procedure, then STOP. Do not perform the Circuit/System Testing or Component Testing as this may result in an unnecessary part replacement. Refer to Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections.

Circuit/System Testing

1. Ignition OFF,and all vehicle systems OFF, disconnect the X1 16-way harness connector at the transmission.
2. Test for less than 5 ohm between terminal 5 and ground at the transmission case.

If 5 ohm or greater

1. Ignition OFF.
2. Test for less than 2 ohm in the ground circuit end to end.

If 2 ohm or greater, repair the open/high resistance in the circuit.
If less than 2 ohm, repair the open/high resistance in the ground connection.

If less than 5 ohm

3. Verify a test lamp illuminates between terminal 4 and ground at the transmission case.

If the test lamp does not illuminate and the circuit fuse is good

1. Ignition OFF.
2. Test for less than 2 ohm in the B+ circuit end to end.

If 2 ohm or greater, repair the open/high resistance in the circuit.
If less than 2 ohm, verify the fuse is not open and there is voltage at the fuse.

If the test lamp does not illuminate and the circuit fuse is open

1. Ignition OFF.
2. Test for infinite resistance between the B+ circuit and ground.

If less than infinite resistance, repair the short to ground on the circuit.

If the test lamp illuminates

4. Ignition OFF.
5. Verify a test lamp illuminates between terminal 12 and ground at the transmission case.

If the test lamp does not illuminate and the circuit fuse is good

1. Ignition OFF.
2. Test for less than 2 ohm in the voltage circuit end to end.

If 2 ohm or greater, repair the open/high resistance in the circuit.
If less than 2 ohm, verify the fuse is not open and there is voltage at the fuse.

If the test lamp does not illuminate and the circuit fuse is open

1. Ignition OFF.
2. Test for infinite resistance between the voltage circuit and ground.

If less than infinite resistance, repair the short to ground on the circuit.

If the test lamp illuminates

6. Replace the Q8 control solenoid valve assembly.

Repair Instructions

* Perform the Reset Transmission Adapts Reset Procedure following all transmission related repairs.
* Perform the Diagnostic Repair Verification Verification Tests after completing the repair.
* Refer to Control Module References Control Module References for control solenoid valve assembly replacement, programming, and setup.