AutoCodes – GMC – P189C 2017 GMC Sierra

P189C 2017 GMC Sierra Code - Transmission Range Command Message Performance

Quick Answer

Control modules connected to the serial data circuits monitor the communication during normal vehicle operation. Common causes include Faulty Transmission Control Module (TCM), Transmission Control Module harness is open or shorted, Transmission Control Module circuit poor electrical connection. 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: P189C 2017 GMC Sierra indicates Transmission Range Command Message Performance.
Common causes: Common causes include Faulty Transmission Control Module (TCM), Transmission Control Module harness is open or shorted, Transmission Control Module circuit poor electrical connection.
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 152

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 Sep 29, 2022

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P189C 2017 GMC Sierra Description

Control modules connected to the serial data circuits monitor the communication during normal vehicle operation. Operating information and commands are exchanged among the control modules. Each module on the serial data circuit maintains a transmit error counter and a receive error counter. The counter values increase with detected errors and decrease with error-free messages. The Diagnostic Trouble Code (DTC) will be set when the Transmission Range Command Message Performance.

OBDII Code P189C 2017 GMC Sierra - Transmission Range Command Message Performance - AutoCodes.com — P189C 2017 GMC Sierra Code - Transmission Range Command Message Performance

What does this mean?

What are the Possible Causes of the DTC P189C 2017 GMC Sierra?

Faulty Transmission Control Module (TCM)
Transmission Control Module harness is open or shorted
Transmission Control Module circuit poor electrical connection

How to Fix the DTC P189C 2017 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 P189C 2017 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 P189C 2017 GMC Sierra 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 P189C 2017 GMC Sierra Code

1. What are the common symptoms of OBDII code P189C in a 2017 GMC Sierra?

The common symptoms of code P189C include issues with shifting gears, hesitation during acceleration, and potential transmission slipping.

2. What can cause the OBDII code P189C to appear on a 2017 GMC Sierra?

The code P189C is typically triggered by a malfunction in the Transmission Range Command Message Performance, which can be caused by faulty wiring, sensor issues, or a problem with the transmission control module.

3. How serious is OBDII code P189C in a 2017 GMC Sierra?

Code P189C should be addressed promptly as it can lead to further transmission problems if left unresolved. It is recommended to diagnose and repair the issue as soon as possible.

4. Can I continue driving my 2017 GMC Sierra with OBDII code P189C?

It is not advisable to continue driving your vehicle with code P189C present, as it can potentially cause further damage to the transmission. It is recommended to address the issue before driving the vehicle again.

5. How can I diagnose OBDII code P189C in my 2017 GMC Sierra?

Diagnosing code P189C typically involves using a professional OBDII scanner to read the code and further testing the transmission range sensor, wiring, and transmission control module for any faults.

6. What are some repair tips for fixing OBDII code P189C in a 2017 GMC Sierra?

Repair tips for resolving code P189C may include checking and repairing any damaged wiring, replacing the transmission range sensor if faulty, or reprogramming the transmission control module.

7. Can I reset OBDII code P189C in my 2017 GMC Sierra without fixing the underlying issue?

Resetting the code without addressing the underlying issue will only temporarily clear the error code. It is crucial to diagnose and repair the problem to prevent the code from reappearing.

8. How much does it typically cost to repair OBDII code P189C in a 2017 GMC Sierra?

The cost of repairing code P189C can vary depending on the exact cause of the issue. It is recommended to consult with a professional mechanic to get an accurate estimate for the repair.

9. Is OBDII code P189C covered under warranty for a 2017 GMC Sierra?

The coverage of OBDII code P189C under warranty will depend on the specific terms of your vehicle's warranty. It is advisable to check with your dealership or refer to your warranty documentation for more information.

10. How can I prevent OBDII code P189C from appearing in my 2017 GMC Sierra in the future?

Regular maintenance of your vehicle, including checking for any transmission-related issues, can help prevent code P189C from appearing. It is also essential to address any warning signs promptly to avoid more significant problems.