C0387 GMC 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 GMC 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.
Code C0387 GMC Description
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.
What are the Possible Causes of the DTC C0387 GMC?
- 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 GMC?
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 GMC 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 GMC code?
Need more information on how to fix the C0387 GMC code? Get Access to Factory Service Manuals
Need Help with the Code?
Get the C0387 GMC code diagnosed by a professional: Find a repair shop in your area
Information for Specific GMC Models
- C0387 2014 GMC Sierra — Unable to Complete Shift
- C0387 2015 GMC Sierra — Unable to Complete Shift
- C0387 2016 GMC Sierra — Unable to Complete Shift
- C0387 2017 GMC Sierra — Unable to Complete Shift
- C0387 2018 GMC Sierra — Unable to Complete Shift
Frequently Asked Questions about C0387 GMC Code
1. What are the common symptoms of OBDII code C0387 GMC "Unable to Complete Shift"?
- Common symptoms include difficulty shifting gears, the transmission slipping, and the vehicle not engaging properly into gear.
2. What are some possible causes of OBDII code C0387 GMC "Unable to Complete Shift"?
- Possible causes include low transmission fluid levels, a faulty shift solenoid, a malfunctioning transmission control module, or issues with the transmission itself.
3. How can I diagnose the OBDII code C0387 GMC "Unable to Complete Shift"?
- Diagnose the code by checking the transmission fluid level, inspecting the shift solenoid, scanning the transmission control module for trouble codes, and performing a thorough transmission inspection.
4. What repairs may be needed for OBDII code C0387 GMC "Unable to Complete Shift"?
- Repairs may include topping up or changing the transmission fluid, replacing the shift solenoid, repairing or replacing the transmission control module, or overhauling the transmission.
5. Can driving with OBDII code C0387 GMC "Unable to Complete Shift" cause further damage?
- Driving with this code may lead to more severe transmission issues, reduced fuel efficiency, and potential safety hazards due to erratic shifting behavior.
6. How urgent is it to address OBDII code C0387 GMC "Unable to Complete Shift"?
- It is recommended to address this code promptly to prevent further damage to the transmission and ensure safe and efficient operation of the vehicle.
7. Are there any DIY tips for fixing OBDII code C0387 GMC "Unable to Complete Shift"?
- DIY tips include checking and topping up the transmission fluid, inspecting and cleaning the shift solenoid, and ensuring proper connection of electrical components.
8. Is it necessary to reset the OBDII code C0387 GMC "Unable to Complete Shift" after repairs?
- Yes, it is important to reset the code using an OBDII scanner after repairs to clear the fault code and ensure proper functioning of the transmission system.
9. Can extreme weather conditions affect OBDII code C0387 GMC "Unable to Complete Shift"?
- Extreme weather conditions, such as extreme heat or cold, can exacerbate existing transmission issues associated with this code and should be taken into consideration during diagnosis and repairs.
10. How can regular maintenance help prevent OBDII code C0387 GMC "Unable to Complete Shift"?
- Regular maintenance, such as checking and changing transmission fluid, inspecting transmission components, and addressing any issues promptly, can help prevent the occurrence of this code and maintain optimal transmission performance.
Discuss the causes and fixes for C0387 GMC OBDII Code
Code C0387 GMC comments
No comments found for this page.
Fix Your Car Smarter
Try the New AutoCodes App!
Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.
