AutoCodes – GMC – C0387 2014 GMC Sierra

C0387 2014 GMC Sierra Code - Unable to Complete Shift

Quick Answer

The Transfer Case Motor, also known as the transfer case range actuator, is a bi-directional, permanent magnet, DC motor. Common causes include Faulty Transfer Case Motor (Transfer Case Two/Four Wheel Drive Actuator), Transfer Case Motor harness is open or shorted, Transfer Case Motor circuit poor electrical connection. 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 Transfer Case Motor (Transfer Case Two/Four Wheel Drive Actuator), Transfer Case Motor harness is open or shorted, Transfer Case Motor circuit poor electrical connection.
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.

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Code Popularity 257

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Jul 11, 2023

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code C0387 2014 GMC Sierra Description

The Transfer Case Motor, also known as the transfer case range actuator, is a bi-directional, permanent magnet, DC motor. When energized, through the transfer case clockwise circuit or transfer case counterclockwise circuit, the ground is provided by the opposing motor control circuit which becomes grounded through the transfer case control module ground circuit. The transfer case range actuator, through a series of gears, rotates the transfer case control actuator shaft which moves the transfer case two/four-wheel drive actuator cam and transfer case high/low shift fork in order to shift the transfer case between the following modes or ranges: 2WD, 4WD/AWD Automatic, 4WD High/Locked, 4WD Low, Neutral.
If the shift lever detent shaft were to bind, or there was a mechanical failure, or the transfer case clockwise circuit and the transfer case counterclockwise circuit were shorted together, the shift would not be completed. This will cause the Diagnostic Trouble Code (DTC) to be set in order to protect system components from damage.

OBDII Code C0387 2014 GMC Sierra - Unable to Complete Shift - AutoCodes.com — C0387 2014 GMC Sierra Code - Unable to Complete Shift

What does this mean?

What are the Possible Causes of the DTC C0387 2014 GMC Sierra?

Faulty Transfer Case Motor (Transfer Case Two/Four Wheel Drive Actuator)
Transfer Case Motor harness is open or shorted
Transfer Case Motor circuit poor electrical connection

How to Fix the DTC C0387 2014 GMC Sierra?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the C0387 2014 GMC Sierra code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the C0387 2014 GMC Sierra code?

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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.