C0374Generic code

C0374 Code: Transfer Case General System Failure

The C0374 code means the transfer case module detected a general system failure: the change of drive mode is not completed or cannot be verified. It often comes with other encoder or shift motor codes that point to the specific cause.

Severity
Medium
Can I keep driving?
Yes, but with caution
Estimated cost
$60 to $700
Difficulty
Medium
System
Chassis, Brakes and Suspension
Applies to
All OBD2 vehicles

Updated Reviewed by Renzo Chacca

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What the C0374 code means

The transfer case on 4x4 trucks with electronic control shifts between 2H, 4H and 4L using an electric motor. An encoder on the motor tells the module the exact position it is in.

The C0374 code usually comes together with other encoder or shift motor codes, which point to the specific cause.

Many failures happen because the shift motor or its encoder end up with moisture or corrosion, since they are mounted on the outside of the case.

Important: many C and B codes are not generic. The definition on this page is the most widespread one, used by General Motors and most generic scan tools, but on other makes the same number can mean something else. Always confirm the code text with a scan tool that reads the right module (ABS, body or airbag).

C0374 code symptoms

  • 4x4 warning light or 4WD service light flashing or on.
  • The drive does not change between 2H, 4H and 4L.
  • The vehicle may be stuck in one drive mode.

Likely causes of the C0374 code

  1. Shift motor or encoder. Confirm it with the tests in the diagnosis section.
  2. Corroded connector. Check the lock, the pins and any moisture or corrosion.
  3. Transfer case oil in poor condition. Check the level, the condition and the viscosity.
  4. Internal mechanism of the case. Uncommon.

How to diagnose the C0374 code step by step

  1. Check the transfer case oil level and condition.
  2. Inspect the shift motor connector for moisture or corrosion.
  3. Read the encoder position on the scan tool while you request a shift.
  4. Check the motor supply and ground.
  5. Check the 4x4 system fuse.

How to fix the C0374 code

  • Clean and seal the connector.
  • Replace the shift motor together with its encoder.
  • Repair the wiring.
  • Recalibrate the case with the scan tool if the manufacturer requires it.

Technical reference data

  • The encoder usually has several tracks that form a code depending on the position.
  • These values are approximate. Check the manufacturer data for your vehicle.

Brand-specific notes

Read every code the module stored. The companion codes tell you whether to look at the encoder, the motor or the case itself.

C0374 on Chevrolet and GMC

This code is very common on the Chevrolet Silverado, Tahoe and Suburban, and on the GMC Sierra and Yukon, with an electronically controlled transfer case.

Frequently asked questions about C0374

What does the C0374 code mean?
It means the transfer case module found a general failure. The change of drive mode is not completed or cannot be verified.
Can I drive with a C0374 code?
Yes, but avoid difficult terrain if you cannot engage four-wheel drive. The C0374 code mostly affects the ability to shift.
Can I stay in 2H?
Normally yes, if the case was left in that position.
What part fails most?
The shift motor with its encoder, which is mounted on the outside of the case.
How much does it cost to fix C0374?
Roughly between $60 and $700. A cleaned connector is at the low end, and a new shift motor is at the high end.
Will a C0374 code clear itself?
Only if the cause was temporary. Old oil, a corroded connector or a failing motor will bring it back.

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Questions about the C0374 code

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