2ML70 - 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 Instructionsprovides an overview of each diagnostic category.

DTC Descriptor
DTC P0562
- System Voltage Low

DTC P0563
- System Voltage High

Circuit/System Description

The transmission control module continuously monitors the system voltage on the Ignition voltage circuits. The transmission control module is located within the control solenoid 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 transmission damage.

Conditions for Running the DTC

P0562

The engine is running.

P0563

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

Conditions for Setting the DTC

P0562

The TCM detects system voltage is less than 10 V for 5 out of 6 seconds.

P0563

The TCM detects system voltage is greater than 18 V for 5 out of 6 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 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

Reference Information
Schematic Reference

* Automatic Transmission Controls Schematics 2ML70 - Automatic Transmission
* Hybrid Controls Schematics

Connector End View Reference

Component Connector End Views Connector End Views By Name
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 Programming and Relearningfor scan tool information.

Circuit/System Verification

1. Engine running with the hood open, accessories OFF, measure and record the battery voltage. The voltage should be between 12.6-15.0 V.

• If not within the specified range, refer to DC Power Conversion Test .

2. Observe the scan tool transmission data ignition voltage parameter. The reading should be between 12.6-15.0 V.

Circuit/System Testing

1. Ignition OFF, disconnect the X1 Q8 control solenoid assembly harness connector at the transmission.
2. Ignition ON, verify that a test lamp illuminates between the ignition voltage circuits listed below and ground.

* Terminal 4
* Terminal 12

• If the test lamp does not illuminate, test the ignition circuit for a Short to Ground or an Open/High Resistance.

3. If all circuits test normal, replace the Q8 control solenoid valve assembly.

Repair Instructions

Perform the Diagnostic Repair Verification Verification Tests after completing the diagnostic procedure.

Control Module References Programming and Relearningfor control solenoid valve assembly replacement, setup, and programming.