AutoCodes – Generic – P074C

P074C Code - Unable To Engage Gear 4

Quick Answer

The Transmission Control Module (TCM) monitors the transmission gear. Common causes include Transmission mechanical problems, Faulty transmission valve body, Faulty Transmission Control Module (TCM). 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: P074C indicates Unable To Engage Gear 4.
Common causes: Common causes include Transmission mechanical problems, Faulty transmission valve body, Faulty Transmission Control Module (TCM).
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.

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Code Popularity 6,612

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on May 08, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
Comments
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Code P074C Description

The Transmission Control Module (TCM) monitors the transmission gear. The TCM sets the OBDII code when the transmission is not at the gear the TCM commands.

OBDII Code P074C - Unable To Engage Gear 4 - AutoCodes.com — P074C Code - Unable To Engage Gear 4

What does this mean?

What are the Possible Causes of the DTC P074C?

Transmission mechanical problems
Faulty transmission valve body
Faulty Transmission Control Module (TCM)
Transmission Control Module (TCM) harness is open or shorted
Transmission Control Module (TCM) circuit poor electrical connection

How to Fix the DTC P074C?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P074C code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

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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.