Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
2005 Buick Century CustomFACTORY OEM SERVICE PROCEDURE
Section 55 (Shift Lock Control System)
WARNING: This page is about a different car, the 2004 Buick Regal, 2004 Buick Century, 2003 Buick Regal, and 2003 Buick Century. However, it is still accessible from the selected car via links, so may be relevant.
- Schematic and Routing Diagrams
- Component Locator
- Diagnostic Information and Procedures
- Diagnostic Starting Point - Automatic Transmission Shift Lock Control
- Diagnostic System Check - Automatic Transmission Shift Lock Control
- Scan Tool Output Controls
- Scan Tool Data List
- Scan Tool Data Definitions
- Diagnostic Trouble Code (DTC) List
- DTC B2707: Gearshift Unlock Circuit
- DTC B2708: Gearshift Unlock Circuit Range/Performance
- Symptoms - Automatic Transmission Shift Lock Control
- Shift Lever Does Not Move with Brake Pedal Depressed (Century)
- Shift Lever Does Not Move with Brake Pedal Depressed (Regal)
- Shift Lever Can Be Moved without Brake Pedal Depressed (Century)
- Shift Lever Can Be Moved without Brake Pedal Depressed (Regal)
- Repair Instructions
- Description and Operation
Factory Service Tools
Use the Manual With the Right Hardware
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.