Transmission Diagnosis

DTC P0563





Circuit Description
The transmission control module (TCM) samples the system voltage on the Ignition 1 circuit every 0.1 seconds. Higher than normal voltage may cause the transmission control solenoids to operate improperly or damage the solid-state components inside the TCM.
If the TCM detects high voltage, DTC P0563 sets. DTC P0563 is a type A DTC.

DTC Descriptor
This diagnostic procedure supports the following DTC:
DTC P0563 System Voltage High

Conditions for Running The DTC
The engine is running for 5 seconds.

Conditions for Setting The DTC
The TCM detects system voltage is 18 volts or greater for 4.3 seconds.

Action Taken When the DTC Sets
^ The TCM requests the engine control module (ECM) to illuminate the malfunction indicator lamp (MIL).
^ The TCM commands maximum line pressure.
^ The TCM commands an immediate landing to 2nd gear.
^ The TCM inhibits TCC engagement.
^ The TCM turns off power to all the solenoids.
^ The TCM freezes transmission adaptive functions.
^ The ECM records the operating conditions when the Conditions for Setting the DTC are met. The ECM stores this information as Freeze Frame and Failure Records.
^ The TCM records the operating conditions when the Conditions for Setting the DTC are met. The TCM stores this information as Failure Records.
^ The TCM stores DTC P0563 in TCM history.

Conditions for Clearing the MIL/DTC
^ The ECM turns OFF the MIL after the third consecutive drive trip in which the TCM does not send a MIL illumination request.
^ A scan tool can clear the MIL/DTC.
^ The TCM clears the DTC from TCM history if the vehicle completes 40 warm-up cycles without an emission related diagnostic fault occurring.
^ The TCM cancels the DTC default actions when the ignition switch is OFF long enough in order to power down the TCM.

Diagnostic Aids
^ Use the scan tool in order to inspect all other modules for voltage related DTCs.
^ Running the engine with a battery charger attached may cause DTC P0563 to set.
^ Inspect the charging circuit for high resistance.
^ Inspect the vehicle battery for open or sulfated cells.

Test Description





The numbers below refer to the step numbers on the diagnostic table.
3. This step tests the charging system voltage with a minimal load.
4. This step obtains the ignition voltage measurement reported by the TCM.