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Engine-Codes – GMC – B2708 GMC

B2708 GMC Code - Gearshift Unlock Circuit High

Quick Answer

The B2708 GMC code indicates a problem with the gearshift unlock circuit being too high. Common causes include Faulty gearshift unlock solenoid, Wiring issues in the gearshift unlock circuit, Faulty 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 GMC indicates Gearshift Unlock Circuit High.
Common causes
Common causes include Faulty gearshift unlock solenoid, Wiring issues in the gearshift unlock circuit, Faulty 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 Sep 10, 2024
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Code B2708 GMC Description

The B2708 GMC code indicates a problem with the gearshift unlock circuit being too high. This circuit is responsible for allowing the gearshift to be moved from park to another gear when the brake pedal is pressed. When this circuit is high, it means that there is an issue with the electrical signal in the circuit that controls this function. This can lead to difficulties in shifting gears, as well as potential safety hazards if the gearshift is unable to move properly.

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

Common Causes of B2708 GMC

  1. Faulty gearshift unlock solenoid
  2. Wiring issues in the gearshift unlock circuit
  3. Faulty brake light switch
  4. Corrosion or damage to electrical connectors
  5. Issues with the transmission control module

Symptoms of B2708 GMC

  1. Difficulty shifting gears
  2. Gearshift getting stuck in park
  3. Inability to move the vehicle
  4. Warning lights on the dashboard related to the transmission

How to Fix B2708 GMC

  1. Begin by checking the gearshift unlock solenoid for proper operation and replace if necessary.
  2. Inspect the wiring in the gearshift unlock circuit for any damage or corrosion and repair as needed.
  3. Test the brake light switch to ensure it is functioning correctly and replace if faulty.
  4. Check for any loose or damaged electrical connectors in the circuit and repair or replace as needed.
  5. If the issue persists, consider checking the transmission control module for any faults and address as necessary.

Cost to Fix B2708 GMC

The typical repair costs for addressing the B2708 GMC code can vary depending on the specific cause of the issue. On average, the cost for parts and labor can range from $150 to $400. It is important to note that diagnosis time and labor rates at auto repair shops can vary, so it is recommended to check local rates for a more precise estimate.

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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 GMC Code

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

The B2708 code indicates a "Gearshift Unlock Circuit High" issue, meaning the circuit responsible for unlocking the gearshift is experiencing a high voltage condition.

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

Common symptoms include the gearshift being stuck in park, difficulty shifting out of park, or the shift interlock system not functioning properly.

3. What causes the B2708 code to appear on a GMC?

Possible causes include a faulty shift interlock solenoid, damaged wiring or connectors in the gearshift unlock circuit, or a malfunctioning brake pedal switch.

4. Can driving with a B2708 code damage my GMC vehicle?

Driving may not cause direct damage, but being unable to shift out of park can leave the vehicle stranded and cause inconvenience.

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

Diagnose the issue by inspecting the shift interlock solenoid, checking for damaged or corroded wiring, and testing the brake pedal switch for proper functionality.

6. What tools are needed to fix the B2708 code on a GMC?

You may need a multimeter to check voltage, a scan tool to clear the code, and basic hand tools to inspect and repair wiring or replace faulty components.

7. How do I fix the B2708 error code on my GMC?

Fixes may involve replacing the shift interlock solenoid, repairing damaged wiring, or replacing the brake pedal switch if it’s faulty.

8. Is the B2708 code covered under warranty for GMC vehicles?

It depends on your vehicle's warranty terms. Check with your GMC dealership to see if the repair is covered.

9. Can a low battery cause the B2708 code on a GMC?

A low or weak battery can sometimes contribute to electrical issues, but it’s less likely to be the root cause of this specific code.

10. How much does it cost to repair the B2708 code on a GMC?

Repair costs vary but typically range from $100 to $300, depending on whether parts like the shift interlock solenoid or brake pedal switch need replacement.

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