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Engine-Codes – GMC – C0374 GMC

C0374 GMC Code - Transfer Case System Malfunction

Quick Answer

The C0374 GMC code indicates a malfunction within the transfer case system of the vehicle. Common causes include Faulty transfer case actuator, Malfunctioning transfer case motor, Defective transfer case control module. 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 GMC indicates Transfer Case System Malfunction.
Common causes
Common causes include Faulty transfer case actuator, Malfunctioning transfer case motor, Defective transfer case control module.
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 C0374 GMC Description

The C0374 GMC code indicates a malfunction within the transfer case system of the vehicle. The transfer case is a critical component in four-wheel drive and all-wheel drive vehicles, responsible for distributing power from the transmission to the front and rear axles. When this system malfunctions, it can lead to serious performance issues and potentially cause damage to other components of the vehicle.

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

Common Causes of C0374 GMC

  1. Faulty transfer case actuator
  2. Malfunctioning transfer case motor
  3. Defective transfer case control module
  4. Wiring or connectivity issues within the transfer case system
  5. Low fluid levels in the transfer case

Symptoms of C0374 GMC

  1. Difficulty shifting between drive modes
  2. Strange noises coming from the transfer case
  3. Vehicle getting stuck in one drive mode
  4. Dashboard warning light related to the transfer case system

How to Fix C0374 GMC

  1. Diagnose the issue using a scan tool to retrieve the specific error code.
  2. Inspect the transfer case components, including the actuator, motor, and control module, for any signs of damage or malfunction.
  3. Test the wiring and connectivity within the transfer case system to identify any issues.
  4. Replace faulty components, such as the actuator, motor, or control module, if necessary.
  5. Clear the error code and test the vehicle to ensure the issue has been resolved.

Cost to Fix C0374 GMC

The cost of repairing a transfer case system malfunction can vary depending on the specific cause of the issue and the extent of the repairs needed. In general, the repair costs for this issue can range from $500 to $1500, including parts and labor. However, it is essential to note that the actual cost can be higher or lower based on factors such as the vehicle make and model, the location of the repair shop, and the hourly labor rates charged. It is recommended to obtain a detailed quote from a trusted mechanic or repair shop to get an accurate estimate for the repair.

What does this mean?

Tech Notes for C0374 GMC

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.

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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 GMC Code

1. What are the common symptoms of OBDII code C0374 GMC indicating a Transfer Case System Malfunction?

- Common symptoms include difficulty shifting gears, strange noises from the transfer case, and the "Service 4WD" warning light illuminated on the dashboard.

2. What are the possible causes of OBDII code C0374 GMC?

- The code C0374 GMC can be triggered by issues with the transfer case shift control module, faulty wiring, damaged connectors, or a malfunctioning transfer case motor.

3. How can I diagnose the cause of OBDII code C0374 GMC?

- Diagnosing the code typically involves using a professional OBDII scanner to retrieve the specific error codes, checking the wiring and connectors for any damage, and testing the transfer case shift control module and motor for proper functionality.

4. Can I still drive my vehicle with OBDII code C0374 GMC present?

- It is not recommended to drive your vehicle with the OBDII code C0374 GMC present, as it can lead to further damage to the transfer case system and affect the drivability of the vehicle.

5. How can I repair OBDII code C0374 GMC related to a Transfer Case System Malfunction?

- Repairing the code C0374 GMC may involve replacing the transfer case shift control module, repairing or replacing damaged wiring and connectors, or replacing the transfer case motor if necessary.

6. Are there any DIY tips for addressing OBDII code C0374 GMC?

- DIY tips include checking the transfer case fluid level, inspecting for any visible damage to wiring and connectors, and ensuring proper connections to the transfer case shift control module.

7. How much does it typically cost to repair OBDII code C0374 GMC?

- The cost of repairing OBDII code C0374 GMC can vary depending on the specific issue causing the malfunction, but it may range from $200 to $800 for parts and labor.

8. Can weather conditions affect the occurrence of OBDII code C0374 GMC?

- Extreme weather conditions, such as excessive heat or cold, can potentially impact the performance of the transfer case system and contribute to the triggering of code C0374 GMC.

9. Is it necessary to reset the OBDII code C0374 GMC after completing repairs?

- Yes, it is important to clear the OBDII code C0374 GMC after completing repairs to reset the system and ensure that the issue has been properly addressed.

10. How often does OBDII code C0374 GMC occur in GMC vehicles?

- OBDII code C0374 GMC related to a Transfer Case System Malfunction is a relatively common issue in GMC vehicles, particularly in models equipped with 4WD systems.

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