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Engine-Codes – GMC – C0387 2014 GMC Sierra

C0387 2014 GMC Sierra Code - Unable to Complete Shift

Quick Answer

The C0387 code for a 2014 GMC Sierra indicates that there is an issue with the vehicle's ability to complete a shift. Common causes include Faulty shift solenoid, Damaged transmission control module, Low transmission fluid levels. 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
C0387 2014 GMC Sierra indicates Unable to Complete Shift.
Common causes
Common causes include Faulty shift solenoid, Damaged transmission control module, Low transmission fluid levels.
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 12, 2024
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Code C0387 2014 GMC Sierra Description

The C0387 code for a 2014 GMC Sierra indicates that there is an issue with the vehicle's ability to complete a shift. This code is typically related to the transmission system and can have a significant impact on the vehicle's performance. When the vehicle is unable to complete a shift, it may result in erratic shifting behavior, difficulty in accelerating or decelerating, and overall poor driving performance. This code can trigger the check engine light on the dashboard, alerting the driver to a potential issue with the transmission system.

OBDII Code C0387 2014 GMC Sierra - Unable to Complete Shift
C0387 2014 GMC Sierra Code - Unable to Complete Shift

Common Causes of C0387 2014 GMC Sierra

  1. Faulty shift solenoid
  2. Damaged transmission control module
  3. Low transmission fluid levels
  4. Transmission valve body issues
  5. Electrical wiring or connection problems

Symptoms of C0387 2014 GMC Sierra

  1. Erratic shifting behavior
  2. Delayed or harsh shifting
  3. Difficulty accelerating or decelerating
  4. Check engine light illuminated on the dashboard

How to Fix C0387 2014 GMC Sierra

  1. Diagnose the issue by using a scan tool to retrieve the specific fault codes and conducting a thorough inspection of the transmission system.
  2. Check the transmission fluid level and condition, topping off or replacing it if necessary.
  3. Inspect the shift solenoid and transmission control module for any signs of damage or malfunction, replacing as needed.
  4. Test the transmission valve body for any blockages or malfunctions, cleaning or replacing components as necessary.
  5. Clear the fault codes, reset the system, and test drive the vehicle to ensure the issue has been resolved.

Cost to Fix C0387 2014 GMC Sierra

The typical repair costs for addressing a C0387 code on a 2014 GMC Sierra can vary depending on the specific cause of the issue. Parts such as a shift solenoid or transmission control module can range from $100 to $500, while labor costs can add another $200 to $500. Overall, the total repair cost for this issue could range from $300 to $1000. It's important to keep in mind that these are rough estimates, and actual costs may vary based on the location, shop rates, and specific vehicle requirements. Be sure to consult with a professional mechanic for a more accurate cost 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 C0387 2014 GMC Sierra Code

1. What are common symptoms of OBDII code C0387 in a 2014 GMC Sierra indicating an "Unable to Complete Shift" issue?

Common symptoms include difficulty shifting gears, the transmission getting stuck in a particular gear, and dashboard warning lights such as the Check Engine Light or Transmission Warning Light.

2. What are the potential causes of OBDII code C0387 in a 2014 GMC Sierra?

Possible causes of this code can include a malfunctioning shift solenoid, low transmission fluid levels, a faulty transmission control module, or electrical issues within the transmission system.

3. How can I diagnose an "Unable to Complete Shift" issue related to OBDII code C0387 in my 2014 GMC Sierra?

Diagnosis typically involves using a diagnostic scanner to retrieve the trouble codes, conducting a visual inspection of the transmission components, checking the transmission fluid level and condition, and testing the shift solenoids and related electrical connections.

4. Can I continue driving my 2014 GMC Sierra with OBDII code C0387, or should I have it repaired immediately?

It is not recommended to continue driving with this code as it can lead to further damage to the transmission system. It is best to have the issue diagnosed and repaired promptly to avoid costly repairs down the line.

5. Are there any DIY repair tips for addressing OBDII code C0387 in a 2014 GMC Sierra?

While some basic checks like inspecting the transmission fluid level can be done at home, diagnosing and repairing the root cause of the issue often requires specialized tools and expertise. It is advisable to seek assistance from a qualified mechanic or dealership for proper diagnosis and repair.

6. How much does it typically cost to repair OBDII code C0387 in a 2014 GMC Sierra?

The cost of repairing this issue can vary depending on the exact cause of the problem, parts needed for replacement, labor costs, and the repair shop's rates. It is advisable to obtain multiple quotes from different repair facilities to compare prices.

7. Can resetting the OBDII system clear the C0387 code in a 2014 GMC Sierra?

While clearing the code may temporarily turn off the warning lights, it will not fix the underlying issue causing the "Unable to Complete Shift" problem. Resetting the system without addressing the root cause can lead to the code reappearing.

8. Is OBDII code C0387 specific to 2014 GMC Sierra models only, or can it occur in other vehicles?

While this code is more commonly associated with GMC Sierra trucks, similar transmission shift issues can occur in other vehicles from various manufacturers. It is always best to refer to the specific diagnostic trouble code definitions for accurate information.

9. Can extreme weather conditions or rough driving terrain trigger OBDII code C0387 in a 2014 GMC Sierra?

While harsh driving conditions can potentially exacerbate existing transmission issues, the root cause of the code is typically related to internal transmission components or electrical malfunctions rather than external factors.

10. How long does it typically take to repair an "Unable to Complete Shift" issue related to OBDII code C0387 in a 2014 GMC Sierra?

The repair time can vary depending on the exact cause of the problem, availability of parts, and the workload of the repair shop. Some repairs may be completed within a few hours, while more complex issues could take a day or longer to resolve.

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