How are Auto Trans Brake Shift Interlock Solenoid issues diagnosed?
When diagnosing a concern of inability to remove the shifter from park, the technician will first ensure there is no issue with installing, turning, or removing the ignition key, and that the brake lights are functioning properly. Then, the technician will listen for the solenoid to make noise upon pressing the brake pedal, signifying that is is either moving or not. If nothing is heard, the technician will check fuses, if any, and check for power and ground at the solenoid. If the solenoid is receiving proper voltage and ground but fails to operate, the technician will remove, bench test, and replace the solenoid as needed.
How are Auto Trans Brake Shift Interlock Solenoids replaced?
Removal of the solenoid may involve removing a trim panel and a few fasteners, or it may require that the gear selector surround trim, console trim panel, and gear selector be removed for access. Once access is available, the solenoid will be removed from electrical connections, and linkages that are connected to the solenoid pushrod, and finally removed after disconnecting fasteners. Replacement is the reverse of removal, and the solenoid can be tested through normal operation of the gear selector and brake pedal.
RepairPal Recommendations for Auto Trans Brake Shift Interlock Solenoid issues
Even if the brake lights work, we recommend testing the brake light switch if the brake shift interlock solenoid is not receiving power. This is because the brake light switch may have a secondary or tertiary circuit for cruise control or the brake shift interlock system. We also recommend replacing any worn bushings in the shifter assembly while it is removed or accessible. These bushings wear out and can cause failure to engage in any drive range, including park.