GM Service Manual Online
For 1990-2009 cars only

Circuit Description

The body control module (BCM) controls the automatic transmission (A/T) shift lock control solenoid ground circuit and monitors the voltage of the ground control circuit.

DTC Descriptor

This diagnostic procedure supports the following DTC:

DTC B2713 Gearshift Lock Circuit High

Conditions for Running the DTC

The controlled ground circuit of the A/T shift lock control solenoid must be ON.

Conditions for Setting the DTC

    • The BCM detects the controlled ground circuit voltage is approximately equal to battery voltage in the ON state.
    • The condition above must be present for more than 0.3 second.
    • This DTC will be set after 20 seconds due to possible false failures.

Action Taken When the DTC Sets

The BCM stores DTC B2713 in memory.

Conditions for Clearing the DTC

    • The BCM determines that the controlled ground circuit of the A/T shift lock control solenoid is no longer shorted to battery voltage.
    • A history DTC B2713 will clear after 100 consecutive ignition cycles if the condition for the malfunction is no longer present.
    • A scan tool may be used to clear the DTC.

Diagnostic Aids

    • If DTC B2713 is a history DTC, the fault may be intermittent. Refer to Testing for Intermittent Conditions and Poor Connections .
    • The following conditions may cause an intermittent malfunction to occur:
       - An intermittent short to battery voltage in the controlled ground circuit of the A/T shift lock control solenoid
       - The A/T shift lock control solenoid coil is shorted to battery voltage internally.
       - The BCM is shorted to battery internally.

Step

Action

Yes

No

Schematic Reference: Shift Lock Control Schematics

Connector End View Reference: Shift Lock Control Connector End Views

1

Did you perform the Diagnostic System Check - Vehicle?

Go to Step 2

Go to Diagnostic System Check - Vehicle

2

  1. Turn ON the ignition, with the engine OFF.
  2. Press and hold the brake pedal.
  3. Attempt to move the gearshift lever from the PARK position.

Does the automatic transmission (A/T) shift lock control system operate correctly?

Go to Diagnostic Aids

Go to Symptoms - Automatic Transmission Shift Lock Control