Transmission Controls Diagnosis

DTC P0560












Circuit Description with 4L30-E Automatic Transmission
The Transmission Control Module (TCM) continuously monitors the system voltage on the Battery Positive Voltage and the Ignition 1 Voltage feed circuits. Higher-than-normal voltage may cause the solenoids inside the transmission to operate improperly or damage solid-state components inside the TCM.
Lower-than-normal voltage may be inadequate to operate the transmission control solenoids properly.
Improper solenoid operation may cause erratic transmission operation and tie-up conditions, which may result in internal damage.
When the TCM detects voltage on one or both power feed circuits that is outside of a calibrated range, DTC P0560 sets. DTC P0560 is a type B DTC.

Condition for Running the DTC
The ignition is ON.

Condition for Setting the DTC
Condition 1:
System voltage is less than 9.0 volts for 2.25 seconds.

Condition 2:
System voltage is greater than 16.0 volts for 2.25 seconds.

Action Taken When the DTC Sets
^ The TCM flashes the sport mode lamp and sends a MIL request to the ECM on the second consecutive drive trip that the diagnostic runs and fails. The ECM then illuminates the MIL.
^ The ECM records the operating conditions in the Freeze Frame at the time of the MIL request from the TCM.
^ The transmission operates in the default mode (maximum line pressure, command 4th gear, inhibit TCC, freeze shift adapts).

Conditions for Clearing the MIL/DTC
^ The ECM turns off the MIL after three consecutive drive trips during which the TCM sends no MIL request.
^ A History DTC clears after forty consecutive warm-up cycles, if no failures are present by this diagnostic or any other emission related diagnostic.
^ The scan tool clears the MIL/DTC.
^ The TCM cancels the DTC default mode actions when the ignition switch is Off long enough in order to power down the TCM.

Diagnostic Aids
Charging the battery with a battery charger or jump-starting an engine may set DTC P0560. If DTC P0560 sets when operating an accessory, inspect the circuits that are associated with that accessory for a loose connection or a higher-than-normal current draw. Also, inspect for the following conditions:
^ Loose or damaged terminals at the generator
^ Loose or worn generator drive belt.

Test Description
The numbers below refer to the step numbers on the diagnostic table.
4. This step tests the charging system voltage.
5. This step tests the battery voltage input at the TCM.
6. This step tests the ignition voltage and battery voltage inputs at the TCM.