C0387 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 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 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?
- 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?
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 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 code?
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Need Help with the Code?
Get the C0387 code diagnosed by a professional: Find a repair shop in your area
Information for Specific Makes
- C0387 Buick — Unable to Complete Shift
- C0387 Cadillac — Unable to Complete Shift
- C0387 Chevrolet — Unable to Complete Shift
- C0387 GMC — Unable to Complete Shift
Frequently Asked Questions about C0387 Code
1. What are the common symptoms of OBDII code C0387 "Unable to Complete Shift"?
- Common symptoms include difficulty shifting gears, the transmission not engaging properly, and the vehicle feeling like it's stuck in a particular gear.
2. What are the possible causes of OBDII code C0387?
- Possible causes can include issues with the transmission control module, faulty shift solenoids, low transmission fluid levels, or a malfunctioning transmission valve body.
3. How can I diagnose the underlying issue causing OBDII code C0387?
- To diagnose the issue, you can perform a thorough inspection of the transmission system, check the transmission fluid level and condition, and use a diagnostic scanner to read the trouble codes and monitor transmission data.
4. Can low transmission fluid cause OBDII code C0387?
- Yes, low transmission fluid levels can lead to OBDII code C0387 as it can cause improper shifting and affect the overall performance of the transmission system.
5. What are some repair tips for fixing OBDII code C0387?
- Repair tips may include checking and topping up transmission fluid levels, inspecting and replacing faulty shift solenoids, ensuring proper connection of transmission control module components, and performing a transmission fluid flush.
6. Is it safe to continue driving with OBDII code C0387 present?
- It is not recommended to continue driving with OBDII code C0387 present, as it can lead to further damage to the transmission system and potentially cause safety hazards on the road.
7. Can a DIY enthusiast fix OBDII code C0387 at home?
- Depending on the root cause of the code, some DIY enthusiasts may be able to fix OBDII code C0387 at home, especially if the issue is related to simple maintenance tasks like checking and refilling transmission fluid.
8. How much does it typically cost to repair OBDII code C0387 at a mechanic or dealership?
- The cost of repairing OBDII code C0387 can vary depending on the specific issue, but it may range from a few hundred to a couple thousand dollars, including parts and labor.
9. Is OBDII code C0387 a common issue in specific vehicle makes or models?
- OBDII code C0387 can occur in various vehicle makes and models, especially those equipped with automatic transmissions, but it may be more prevalent in certain brands or models known for transmission issues.
10. Can resetting the OBDII code C0387 on my vehicle make the issue go away permanently?
- Resetting the OBDII code C0387 may temporarily clear the error code, but if the underlying issue causing the code is not addressed and fixed, it is likely to reoccur. It's important to diagnose and repair the root cause of the problem for a permanent solution.
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