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DTC B2705

Diagnostic Instructions
    • Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
    • Review Strategy Based Diagnosis for an overview of the diagnostic approach.
    • Diagnostic Procedure Instructions provides an overview of each diagnostic category.

DTC Descriptor

DTC B2705: Gearshift Unlock Circuit

Circuit/System Description

The body control module (BCM) controls the automatic transmission shift lock control solenoid by providing a battery positive voltage to the solenoid. The BCM utilises a smart driver to control the voltage supply circuit to the automatic transmission shift lock control solenoid. The smart driver monitors the voltage and current flow of the control circuit.

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

Conditions for Setting the DTC

The DTC sets if there is a short to ground, open/high resistance, or short to voltage in the automatic transmission shift lock control solenoid control circuit.

Action Taken When the DTC Sets

The BCM will not attempt to enable the voltage supply circuit of the automatic transmission shift lock control solenoid until the next key cycle.

Conditions for Clearing the DTC
    • A current DTC B2705 will clear when the malfunction is no longer present and the ignition switch is cycled.
    • A history DTC will clear after 100 ignition cycles with no current DTC active during the 100 ignition cycles.

Reference Information

Schematic Reference

Shift Lock Control Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Automatic Transmission Shift Lock Control Description and Operation

Electrical Information Reference

    •  Circuit Testing
    •  Connector Repairs
    •  Testing for Intermittent Conditions and Poor Connections
    •  Wiring Repairs

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification

Ignition ON, clear the DTC. Observe the brake lights while pressing and releasing the brake pedal. The brake lights turn ON and OFF.

⇒If the brake lights do not turn ON and OFF, refer to Symptoms - Lighting .

Circuit/System Testing
  1. Ignition OFF, disconnect the harness connector at the shift lock control solenoid.
  2. Ignition OFF, test for less than 30 Ω between the ground circuit terminal 2 and ground.
    3. ⇒If greater than the specified range, test the ground circuit for an open/high resistance.
  3. Install a test lamp between the ground circuit terminal 2 and the control circuit terminal 4.
  4. Ignition ON, verify the test lamp turns ON and OFF while pressing and releasing the brake pedal.
    5. ⇒If the test lamp is always ON, test the control circuit for short to voltage. If the circuit tests normal, replace the BCM.
    ⇒If the test lamp is always OFF, test the control circuit for short to ground or an open/high resistance. If the circuit tests normal, replace the BCM.
  5. If the circuit tests normal, replace the transmission control.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

    • Transmission Control Replacement for the 6T30, 6T40, and, 6T45 transmission
    • Control Module References for BCM replacement, setup, and programming
   


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