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Engine-Codes – Buick – B2708 Buick

B2708 Buick Code - Gearshift Unlock Circuit High

Quick Answer

The B2708 diagnostic trouble code (DTC) is specific to Buick vehicles and indicates a malfunction in the gearshift unlock circuit, which is responsible for allowing the driver to shift the transmission out of the "Park" position. Common causes include Faulty brake light switch that fails to signal the BCM when the brake pedal is pressed, Damaged or corroded wiring in the gearshift unlock circuit, Malfunctioning body control module (BCM) that misinterprets signals from the brake light switch. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means
B2708 Buick indicates Gearshift Unlock Circuit High.
Common causes
Common causes include Faulty brake light switch that fails to signal the BCM when the brake pedal is pressed, Damaged or corroded wiring in the gearshift unlock circuit, Malfunctioning body control module (BCM) that misinterprets signals from the brake light switch.
Severity
High - diagnose this code as soon as possible.
Can I drive?
Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
What is this?
Table of contents Created and updated by William Orellana on Oct 15, 2024
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Code B2708 Buick Description

The B2708 diagnostic trouble code (DTC) is specific to Buick vehicles and indicates a malfunction in the gearshift unlock circuit, which is responsible for allowing the driver to shift the transmission out of the "Park" position. This code suggests that the circuit is registering a high voltage condition, which could prevent the gearshift from being released. The gearshift unlock mechanism is typically controlled by the vehicle's body control module (BCM) and is designed to enhance safety by ensuring that the vehicle cannot be shifted out of Park unless the brake pedal is depressed.

OBDII Code B2708 Buick - Gearshift Unlock Circuit High
B2708 Buick Code - Gearshift Unlock Circuit High

Common Causes of B2708 Buick

  1. Faulty brake light switch that fails to signal the BCM when the brake pedal is pressed.
  2. Damaged or corroded wiring in the gearshift unlock circuit.
  3. Malfunctioning body control module (BCM) that misinterprets signals from the brake light switch.
  4. Issues with the gearshift assembly itself, such as mechanical binding or failure of internal components.
  5. Software glitches or programming errors within the BCM that affect gearshift operations.

Symptoms of B2708 Buick

  1. Inability to shift out of the "Park" position.
  2. Warning lights illuminated on the dashboard, particularly the gearshift or brake warning lights.
  3. Intermittent or complete failure of the brake lights to illuminate when the brake pedal is pressed.
  4. Unusual clicking or buzzing sounds from the gearshift area when attempting to shift.
  5. Occasional failure of the gearshift to lock in "Park" when the vehicle is turned off.

How to Fix B2708 Buick

  1. Diagnostic Testing: Begin with a thorough diagnostic scan to confirm the presence of the B2708 code and check for any related codes that may provide additional context.
  2. Inspect Wiring and Connectors: Visually inspect the wiring harness and connectors associated with the gearshift unlock circuit for signs of damage, corrosion, or loose connections. Repair or replace any damaged components as necessary.
  3. Test the Brake Light Switch: Check the functionality of the brake light switch to ensure it is operating correctly. Replace the switch if it is found to be faulty.
  4. BCM Inspection: If wiring and the brake light switch are functioning properly, test the BCM for faults. Reprogram or replace the BCM if it is determined to be defective.
  5. Gearshift Assembly Check: If all other components are functioning correctly, inspect the gearshift assembly for mechanical issues that could be preventing proper operation.

Cost to Fix B2708 Buick

The cost to repair the B2708 code can vary widely based on the specific diagnosis and repairs needed. On average, you might expect to pay between $150 and $500 for repairs, which could include parts and labor. For example, a brake light switch replacement typically costs around $50 to $150, while BCM replacement can range from $200 to $500, depending on the make and model. Labor costs can vary significantly, with most auto repair shops charging between $80 and $150 per hour. In metropolitan areas or at dealerships, rates may be higher, while independent shops may offer lower rates. It is advisable to check local rates for a more precise estimate and to obtain multiple quotes for the repair work needed.

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about B2708 Buick Code

1. What does the OBDII code B2708 mean on a Buick?

B2708 indicates a problem with the gearshift unlock circuit, specifically that the circuit is experiencing a high voltage condition.

2. What are common symptoms of the B2708 code in a Buick?

Common symptoms include the gearshift being stuck in park, the inability to shift out of park, or a malfunctioning shift interlock system.

3. What causes the B2708 code to appear in a Buick?

Possible causes include a faulty shift lock solenoid, damaged wiring or connectors in the gearshift unlock circuit, or an issue with the vehicle’s body control module (BCM).

4. Can I still drive my Buick with the B2708 code?

It may be difficult or impossible to drive if the gearshift is stuck in park. It’s recommended to address the issue promptly to avoid further complications.

5. How do I diagnose the B2708 code on my Buick?

Start by inspecting the gearshift unlock circuit wiring and connectors for damage or corrosion. Then, test the shift lock solenoid and check the voltage levels in the circuit.

6. What repairs can fix the B2708 code in a Buick?

Repairs may include replacing a faulty shift lock solenoid, repairing damaged wiring or connectors, or reprogramming or replacing the body control module (BCM) if necessary.

7. How much does it cost to fix the B2708 code on a Buick?

Repair costs can vary, but replacing a shift lock solenoid typically costs $150–$300, while BCM repairs or replacements can be more expensive, ranging from $300–$800.

8. Can a dead battery cause the B2708 code in a Buick?

A low or dead battery is unlikely to directly cause this code, but electrical issues related to the battery can potentially affect the gearshift unlock circuit’s performance.

9. Is the B2708 code a common issue in Buick vehicles?

While not extremely common, the B2708 code can occur in Buicks, especially in older models with worn electrical components or shift interlock systems.

10. Do I need a professional to repair the B2708 code on my Buick?

If you have experience with automotive electrical systems, you may be able to diagnose and repair the issue yourself. However, a professional mechanic is recommended for complex repairs like BCM replacement.

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