AutoCodes – GMC – P0894 2018 GMC Sierra

P0894 2018 GMC Sierra Code - Transmission Component Slipping

Quick Answer

When the Engine Control Module (ECM) requests the neutral locked turbine feature, the Transmission Control Module (TCM) commands the 3rd, 5th, and reverse clutch and the 2-6 clutch to apply, which locks the turbine shaft. Common causes include Low transmission fluid level, Dirty or contaminated fluid, Internal transmission failure. 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: P0894 2018 GMC Sierra indicates Transmission Component Slipping.
Common causes: Common causes include Low transmission fluid level, Dirty or contaminated fluid, Internal transmission failure.
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 219

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 Aug 03, 2022

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P0894 2018 GMC Sierra Description

When the Engine Control Module (ECM) requests the neutral locked turbine feature, the Transmission Control Module (TCM) commands the 3rd, 5th, and reverse clutch and the 2-6 clutch to apply, which locks the turbine shaft. This provides a load to the engine and reduces the engine warm-up time. The Diagnostic Trouble Code (DTC) will be set when the TCM detects turbine speed greater than 50 RPM for 3 s. This condition must occur 3 times.

OBDII Code P0894 2018 GMC Sierra - Transmission Component Slipping - AutoCodes.com — P0894 2018 GMC Sierra Code - Transmission Component Slipping

What does this mean?

What are the Possible Causes of the DTC P0894 2018 GMC Sierra?

Low transmission fluid level
Dirty or contaminated fluid
Internal transmission failure
Faulty Transmission Control Moduleâ€‰(TCM)
Transmission Control Module harness is open or shorted
Transmission Control Module circuit poor electrical connection

How to Fix the DTC P0894 2018 GMC Sierra?

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 P0894 2018 GMC Sierra 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.

Need more information about the P0894 2018 GMC Sierra code?

Need more information on how to fix the P0894 2018 GMC Sierra code? Get Access to Factory Service Manuals

Need Help with the 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 P0894 2018 GMC Sierra Code

1. What does OBDII code P0894 mean for my 2018 GMC Sierra?

This code indicates a problem with the Transmission Component Slipping, specifically related to the transmission control module.

2. What are the common symptoms of OBDII code P0894 in a 2018 GMC Sierra?

Common symptoms include harsh shifting, transmission slipping, reduced fuel efficiency, and the transmission going into limp mode.

3. What are the possible causes of OBDII code P0894 in a 2018 GMC Sierra?

Causes may include low transmission fluid levels, a faulty transmission control module, internal transmission damage, or issues with the torque converter.

4. How can I diagnose OBDII code P0894 in my 2018 GMC Sierra?

Diagnosis involves using an OBDII scanner to read the code, checking the transmission fluid level and quality, inspecting the transmission control module, and performing a thorough transmission system inspection.

5. Can I continue driving my 2018 GMC Sierra with OBDII code P0894?

It is not recommended to drive the vehicle with this code present as it can lead to further damage to the transmission and potentially unsafe driving conditions.

6. How should I repair OBDII code P0894 in my 2018 GMC Sierra?

Repair may involve topping up or changing the transmission fluid, replacing the transmission control module, repairing internal transmission components, or addressing torque converter issues.

7. Will resetting the OBDII code P0894 in my 2018 GMC Sierra fix the problem?

Resetting the code may temporarily clear the warning light, but the underlying issue causing the code will still need to be diagnosed and repaired to prevent further transmission damage.

8. How much does it cost to repair OBDII code P0894 in a 2018 GMC Sierra?

Costs can vary depending on the specific cause of the code, but repairs for this issue can range from a few hundred to over a thousand dollars, especially if internal transmission components need to be replaced.

9. Can I prevent OBDII code P0894 from occurring in my 2018 GMC Sierra?

Regular maintenance, such as checking and changing transmission fluid as recommended, can help prevent issues that may trigger this code. Additionally, driving gently and avoiding harsh acceleration can help prolong the life of the transmission components.

10. Is OBDII code P0894 a common issue in 2018 GMC Sierra vehicles?

While not extremely common, some 2018 GMC Sierra owners have reported experiencing this issue, particularly if the vehicle is used for towing heavy loads or subjected to harsh driving conditions.