P0563

DTC P0563





Circuit Description
The transmission control module (TCM) continuously monitors the system voltage on the Ignition 1 circuits. Higher than normal voltage may cause the solenoids inside the transmission to operate improperly or damage solid-state components inside the TCM.

When 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
^ No engine speed signal DTC P0727
^ No Communications DTC U2104 or U0100
^ Trans. Protection Mode is OFF.
^ Transmission input shaft speed is greater than 400 RPM.

Conditions for Setting The DTC
The TCM detects system voltage is greater than 18 volts for 20 seconds.

Action Taken When the DTC Sets
^ The TCM requests the powertrain control module (PCM) to illuminate the malfunction indicator lamp (MIL).
^ The TCM turns the Trans. Protection Mode ON.
^ The transmission will operate in 5th gear when the transmission is shifted into D or I range and 2nd gear when shifted into L range.
^ The line pressure is at maximum.
^ The torque converter clutch (TCC) is disabled.
^ The TCM freezes the transmission adaptive functions.
^ The PCM records the operating conditions when the Condition for Setting the DTC are met. The PCM 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 Record.
^ The TCM stores DTC P0563 in TCM history.

Conditions for Clearing the MIL/DTC
^ The TCM turns OFF the MIL request during the third consecutive trip in which the diagnostic test runs and passes.
^ 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
^ Observe the driver information center (DIC) messaging that would indicate the electrical system requires service.
^ 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

Step 1 - Step 8:

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.