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C0374 Buick Code - Transfer Case System Malfunction

Quick Answer

The C0374 Buick diagnostic trouble code indicates a malfunction in the transfer case system. Common causes include Faulty transfer case control module, Sensor malfunction within the transfer case system, Wiring or connector issues. 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
C0374 Buick indicates Transfer Case System Malfunction.
Common causes
Common causes include Faulty transfer case control module, Sensor malfunction within the transfer case system, Wiring or connector issues.
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 06, 2024
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Code C0374 Buick Description

The C0374 Buick diagnostic trouble code indicates a malfunction in the transfer case system. The transfer case is an essential component in all-wheel drive (AWD) and four-wheel drive (4WD) vehicles, as it transfers power from the transmission to the front and rear axles. When this system malfunctions, it can lead to a variety of issues that affect the vehicle's drivability and overall performance.

OBDII Code C0374 Buick - Transfer Case System Malfunction
C0374 Buick Code - Transfer Case System Malfunction

Common Causes of C0374 Buick

  1. Faulty transfer case control module
  2. Sensor malfunction within the transfer case system
  3. Wiring or connector issues
  4. Mechanical failure within the transfer case
  5. Low or contaminated transfer case fluid

Symptoms of C0374 Buick

  1. Illumination of the "Service 4WD" or "Service AWD" warning light on the dashboard
  2. Difficulty shifting between drive modes (e.g., 2WD, 4WD)
  3. Unusual noises coming from the transfer case or drivetrain
  4. Vehicle getting stuck in a specific drive mode
  5. Loss of power or reduced acceleration

How to Fix C0374 Buick

  1. Perform a thorough diagnostic scan to confirm the C0374 Buick code and identify the specific issue within the transfer case system.
  2. Inspect the wiring, connectors, and sensors for any signs of damage or corrosion. Replace any faulty components.
  3. Check the transfer case fluid level and quality. Top up or replace the fluid if necessary.
  4. Test the transfer case control module and replace it if it is found to be faulty.
  5. Clear the trouble code, reset the system, and test drive the vehicle to ensure the issue has been resolved.

Cost to Fix C0374 Buick

The cost of repairing a transfer case system malfunction can vary depending on the specific issue and the vehicle's make and model. On average, the repair costs for this type of problem can range from $300 to $800, including parts and labor. It's important to note that diagnostic time and labor rates at auto repair shops can vary, so it's recommended to obtain quotes from multiple shops to get a more accurate estimate. Additionally, the rates may be higher at dealerships or in metropolitan areas, while independent shops typically offer more competitive prices.

What does this mean?

Tech Notes for C0374 Buick

There is factory service bulletin with the following information:

The speed sensor signal may have become corrupted. Possible openings in the speed sensor wire insulation (twisted pairs) can allow water intrusion. Also, wire connections contaminated by water may result in short circuits and erroneous speed sensor readings. This most often occurs on the rear speed sensor circuit.

Correct problem by inspecting the wiring harness to the transfer case speed sensors. Completely inspect and test all wiring. Replace the affected twisted pairs.

Need more information about the C0374 Buick 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 C0374 Buick Code

1. What are the common symptoms of OBDII code C0374 in a Buick related to Transfer Case System Malfunction?

The common symptoms include difficulty shifting gears, erratic shifting behavior, and the illumination of the "Service 4WD" or "Service AWD" warning lights on the dashboard.

2. What are some possible causes of OBDII code C0374 in a Buick indicating a Transfer Case System Malfunction?

Possible causes may include a faulty transfer case control module, damaged wiring or connectors in the transfer case system, or issues with the transfer case shift motor.

3. How can I diagnose the OBDII code C0374 in my Buick related to Transfer Case System Malfunction?

Diagnosis typically involves using a diagnostic scan tool to retrieve the specific trouble code, checking the transfer case control module for any stored codes, and conducting a thorough visual inspection of the transfer case components.

4. Can I continue driving my Buick with OBDII code C0374 indicating a Transfer Case System Malfunction?

It is not recommended to continue driving the vehicle with this code present, as it may lead to further damage to the transfer case system and potentially compromise the vehicle's drivability and safety.

5. What are some repair tips for addressing OBDII code C0374 in a Buick due to Transfer Case System Malfunction?

Repair tips may include checking and repairing any damaged wiring or connectors, replacing the transfer case control module if necessary, and ensuring proper functioning of the transfer case shift motor.

6. Is it possible to reset OBDII code C0374 in a Buick after repairing the Transfer Case System Malfunction?

After repairing the underlying issue causing the code, it is recommended to use a diagnostic scan tool to clear the code from the vehicle's memory and reset the system for proper operation.

7. How much does it typically cost to repair OBDII code C0374 related to Transfer Case System Malfunction in a Buick?

The cost of repair can vary depending on the specific issue causing the code, the labor rates in your area, and whether any parts need to be replaced. It is advisable to consult with a qualified mechanic for an accurate estimate.

8. Can extreme weather conditions affect the occurrence of OBDII code C0374 in a Buick indicating Transfer Case System Malfunction?

Extreme weather conditions, such as very cold temperatures or water exposure, can potentially impact the transfer case components and lead to system malfunctions triggering this trouble code.

9. Are there any preventive maintenance measures I can take to avoid OBDII code C0374 in my Buick related to Transfer Case System Malfunction?

Regularly inspecting and maintaining the transfer case system, ensuring proper fluid levels, and addressing any warning signs promptly can help prevent issues that may trigger this code.

10. How long does it typically take to repair OBDII code C0374 in a Buick caused by Transfer Case System Malfunction?

The repair time can vary depending on the complexity of the issue, availability of parts, and the mechanic's expertise. In general, it may take a few hours to a full day to diagnose and repair the problem.

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