Engine-Codes - Oldsmobile - C0374 OLDSMOBILE

C0374 OLDSMOBILE - Transfer Case System Malfunction

Repair Importance Level: 3/3
Repair Difficulty Level: 3/3  What is this?
Table of contents

C0374 OLDSMOBILE Possible Causes

  • Faulty Transfer Case Motor/Encoder
  • Transfer Case Motor/Encoder harness is open or shorted
  • Transfer Case Motor/Encoder circuit poor electrical connection

How is the C0374 OLDSMOBILE code repair?

Start by checking the "Possible Causes" listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector's pins.

Tech Notes

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.

What is the cost to diagnose the C0374 OLDSMOBILE code

Labor: 1.0

The cost to diagnose the C0374 OLDSMOBILE code is 1.0 hour of labor. The auto repair labor rates vary widely across the country, and even within the same city. Most auto repairs shops charge between $75 and $150 per hour.

Possible Symptoms

  • Anti-Lock Brake System (ABS) Warning Light ON
  • Engine Light ON (or Service Engine Soon Warning Light)

C0374 OLDSMOBILE Meaning

The transfer case shift control module senses rear slip. After several attempts of applying torque to the front wheels, by activating the encoder motor, the transfer case still sees a difference in speed between the front propshaft speed sensor and rear propshaft speed sensor. The transfer case shift control module is unable to correct sensed wheel slip for 10 consecutive seconds.

More Information

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