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C0387 Chevrolet Code - Unable to Complete Shift

Quick Answer

The C0387 diagnostic trouble code (DTC) for Chevrolet vehicles indicates that the system is unable to complete a shift. Common causes include Faulty transfer case shift control module, Wiring harness issues, Blown fuse related to the 4-wheel drive system. 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 Chevrolet indicates Unable to Complete Shift.
Common causes
Common causes include Faulty transfer case shift control module, Wiring harness issues, Blown fuse related to the 4-wheel drive system.
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 07, 2024
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Code C0387 Chevrolet Description

The C0387 diagnostic trouble code (DTC) for Chevrolet vehicles indicates that the system is unable to complete a shift. This typically refers to an issue with the transfer case shift control module, which is responsible for controlling the transfer case in 4-wheel drive and all-wheel drive vehicles. The transfer case is a crucial component that allows the driver to switch between two-wheel drive, 4-wheel drive high, and 4-wheel drive low modes, depending on road conditions.

OBDII Code C0387 Chevrolet - Unable to Complete Shift
C0387 Chevrolet Code - Unable to Complete Shift

Common Causes of C0387 Chevrolet

  1. Faulty transfer case shift control module
  2. Wiring harness issues
  3. Blown fuse related to the 4-wheel drive system
  4. Low transfer case fluid level
  5. Mechanical failure in the transfer case mechanism

Symptoms of C0387 Chevrolet

  1. Difficulty shifting between drive modes
  2. Dashboard warning lights related to the 4-wheel drive system
  3. Grinding or clunking noises when attempting to shift
  4. Vehicle getting stuck in a particular drive mode

How to Fix C0387 Chevrolet

  1. Perform a diagnostic scan to retrieve the specific error codes and pinpoint the root cause of the issue.
  2. Inspect the wiring harness and connectors for any signs of damage or corrosion.
  3. Check the transfer case fluid level and top up if necessary.
  4. Replace the transfer case shift control module if it is found to be faulty.
  5. Test the system after repairs to ensure proper function and clear any remaining error codes.

Cost to Fix C0387 Chevrolet

The typical repair costs for addressing a C0387 Chevrolet code can range from $200 to $600, depending on the extent of the issue and the specific repairs needed. This estimate includes parts and labor costs. However, it is important to note that prices may vary based on the location of the repair shop, the make and model of the vehicle, and the type of engine involved. Additionally, diagnosis time and labor rates at auto repair shops can impact the final cost, with hourly rates typically ranging from $80 to $150. It is advisable to contact local repair shops for a more accurate estimate based on your specific situation.

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Information for Specific Chevrolet Models

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 Chevrolet Code

What does OBDII code C0387 mean for a Chevrolet vehicle?

OBDII code C0387 indicates that the vehicle's transmission control module (TCM) is unable to complete a shift, often due to issues with the transmission system or related components.

What are common symptoms associated with code C0387?

Common symptoms include harsh or erratic shifting, slipping of the transmission, warning lights on the dashboard (such as the check engine light), and potential loss of power during acceleration.

What could cause the C0387 code to trigger?

Possible causes include low transmission fluid, a faulty transmission control module, issues with the shift solenoid, wiring problems, or mechanical failures within the transmission itself.

How can I diagnose the C0387 code?

To diagnose the code, start by checking the transmission fluid level and condition. Then, inspect the wiring and connectors related to the transmission control module and shift solenoid. Scanning the vehicle for additional trouble codes can also provide more context.

What steps can I take to repair the issue indicated by code C0387?

Repairs may involve replacing low transmission fluid, fixing any damaged wiring, replacing a faulty shift solenoid, or reprogramming or replacing the transmission control module, depending on what the diagnosis reveals.

Can I drive my vehicle if it has the C0387 code?

While it may be possible to drive with code C0387, it is not recommended as it could lead to further transmission damage or decreased vehicle performance. It's best to have it assessed and repaired promptly.

Is there a risk of further damage if I ignore code C0387?

Yes, ignoring code C0387 can lead to more severe transmission problems, possibly resulting in costly repairs or complete transmission failure. Prompt attention is advisable.

Will clearing the code C0387 fix the problem?

Clearing the code may temporarily turn off the check engine light, but it will not resolve the underlying issue. The code is likely to reappear if the root cause is not addressed.

How much might it cost to fix a C0387 code issue?

Repair costs can vary widely depending on the cause of the code. Simple fixes like fluid changes may cost under $100, while more complex repairs, such as replacing the transmission control module, can range from $500 to over $2000.

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