AutoCodes – GMC – C0387 2016 GMC Sierra

C0387 2016 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 2016 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 256

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 2016 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 2016 GMC Sierra - Unable to Complete Shift - AutoCodes.com — C0387 2016 GMC Sierra Code - Unable to Complete Shift

What does this mean?

What are the Possible Causes of the DTC C0387 2016 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 2016 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 2016 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 2016 GMC Sierra code?

Need more information on how to fix the C0387 2016 GMC Sierra code? Get Access to Factory Service Manuals

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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 2016 GMC Sierra Code

1. What does OBDII code C0387 on a 2016 GMC Sierra indicate?

The OBDII code C0387 on a 2016 GMC Sierra indicates that the vehicle's transmission is unable to complete a shift.

2. What are the common symptoms of OBDII code C0387 in a 2016 GMC Sierra?

Common symptoms of OBDII code C0387 in a 2016 GMC Sierra include difficulty shifting gears, rough shifting, or the transmission not shifting at all.

3. What are the possible causes of OBDII code C0387 in a 2016 GMC Sierra?

Possible causes of OBDII code C0387 in a 2016 GMC Sierra include low transmission fluid, a faulty shift solenoid, a malfunctioning transmission control module, or internal transmission issues.

4. How can I diagnose the issue related to OBDII code C0387 in my 2016 GMC Sierra?

Diagnosing the issue related to OBDII code C0387 in a 2016 GMC Sierra may require a professional scan tool to read the specific transmission fault codes, checking the transmission fluid level and condition, and conducting a visual inspection of the transmission components.

5. Can I continue driving my 2016 GMC Sierra with OBDII code C0387?

It is not recommended to continue driving your 2016 GMC Sierra if you are experiencing issues related to OBDII code C0387, as it can lead to further damage to the transmission.

6. How can I repair OBDII code C0387 in my 2016 GMC Sierra?

Repairing OBDII code C0387 in a 2016 GMC Sierra may involve topping up or replacing the transmission fluid, replacing a faulty shift solenoid, repairing or replacing the transmission control module, or addressing any internal transmission problems.

7. Can a DIY enthusiast fix OBDII code C0387 in a 2016 GMC Sierra?

While some basic maintenance tasks related to OBDII code C0387 in a 2016 GMC Sierra can be done by a DIY enthusiast, complex transmission repairs may require professional expertise and specialized tools.

8. How much does it cost to repair OBDII code C0387 in a 2016 GMC Sierra?

The cost to repair OBDII code C0387 in a 2016 GMC Sierra can vary depending on the specific issue, the parts needed, and the labor costs involved. It is recommended to get a diagnosis from a trusted mechanic for an accurate estimate.

9. Are there any preventative measures to avoid OBDII code C0387 in a 2016 GMC Sierra?

Regularly checking and maintaining the transmission fluid level, following the manufacturer's recommended service schedule, and addressing any transmission issues promptly can help prevent OBDII code C0387 in a 2016 GMC Sierra.

10. How long does it take to repair OBDII code C0387 in a 2016 GMC Sierra?

The time it takes to repair OBDII code C0387 in a 2016 GMC Sierra can vary depending on the complexity of the issue and the availability of parts. Some repairs may be completed within a few hours, while others may take longer.