P1625

DTC P1625












Circuit Description with 4L30-E Automatic Transmission
The Transmission Control Module (TCM) provides voltage to the pressure control solenoid, the shift solenoids, the band apply solenoid, and the TCC enable solenoid through an internal power control relay. A normal function of the TCM is to run tests on the power control relay to ensure that it is functioning properly. The power control relay has two output terminals on the TCM. The pressure control solenoid signal circuit receives voltage from TCM terminal 52. The other solenoids receive voltage from TCM terminal 53. TCM terminals 52 and 53 are connected inside the TCM.
When the TCM detects a short to ground or short to B+ on the power control relay circuit, then DTC P1625 sets. DTC P1625 is a type B DTC.

Condition for Running the DTC
The ignition is ON.

Condition for Setting the DTC
The TCM detects a short to ground or short to B+ on the power control relay circuit.

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.