B2709

DTC B2709





Circuit Description
The Body Control Module (BCM) controls the Automatic Transmission (A/T) shift lock control solenoid by providing battery voltage to the solenoid. The BCM utilizes a smart driver to control the voltage supplied to the A/T shift lock control solenoid. The smart driver monitors the voltage and current flow of the control circuit. DTC B2709 will set when the BCM detects an open circuit during the shift lock control solenoid operation.

DTC Descriptor
This diagnostic procedure supports the following DTC:
DTC B2709 Gearshift Unlock Circuit Open

Conditions for Running the DTC
^ The ignition switch is in the ON position.
^ The brake pedal is depressed.
^ The transmission the PARK position.

Conditions for Setting the DTC
The BCM detects an open at the shift lock control solenoid output driver for a minimum of one second.

Action Taken When the DTC Sets
The BCM disables shift lock control solenoid operation until the next key cycle.

Conditions for Clearing the DTC
^ A current DTC B2709 will clear when the malfunction is no longer present and the ignition switch is cycled.
^ All BCM history codes will clear after 100 ignition cycles with no current codes active during the 100 ignition cycles.

Diagnostic Aids
^ If the A/T shift lock control circuit is shorted to battery positive voltage, the A/T shift lock control solenoid will be unlocked. The vehicle will shift out of PARK, without depressing the brake pedal.
^ Perform the tests while wiggling the wires and connectors. This may often cause an intermittent malfunction to appear. Refer to Testing for Intermittent Conditions and Poor Connections in Computers and Control Systems.

Test Description
The numbers below refer to the step numbers on the diagnostic table.
2. Listen for an audible click when the A/T shift lock control solenoid operates. Command both the ON and OFF states. Repeat the commands, as necessary.
3. This step tests for voltage at the command voltage circuit of the A/T shift lock control solenoid.
5. This step tests if ground is constantly being applied to the A/T shift lock control solenoid.