AutoCodes – GMC – P189C 2014 GMC Sierra

P189C 2014 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 2014 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 224

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 2014 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 2014 GMC Sierra - Transmission Range Command Message Performance - AutoCodes.com — P189C 2014 GMC Sierra Code - Transmission Range Command Message Performance

What does this mean?

What are the Possible Causes of the DTC P189C 2014 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 2014 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 2014 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 2014 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 2014 GMC Sierra Code

1. What are common symptoms of OBDII code P189C in a 2014 GMC Sierra?

The common symptoms of code P189C include issues with shifting gears, hesitation or jerking during acceleration, and the transmission may go into limp mode.

2. What causes the OBDII code P189C to appear in a 2014 GMC Sierra?

Code P189C is typically triggered by a malfunction in the transmission range command message performance, which can be caused by faulty wiring, a defective transmission range sensor, or issues with the transmission control module.

3. How serious is OBDII code P189C in a 2014 GMC Sierra?

Code P189C should be addressed promptly as it can lead to drivability issues and potentially cause damage to the transmission if left unresolved.

4. Can I continue to drive my 2014 GMC Sierra with OBDII code P189C?

It's not recommended to continue driving your vehicle with code P189C present, as it can result in poor performance and further damage to the transmission.

5. How can I diagnose OBDII code P189C in my 2014 GMC Sierra?

Diagnosing code P189C usually involves using a scan tool to retrieve the code, checking the transmission range sensor for proper operation, inspecting wiring for any damage, and verifying the functionality of the transmission control module.

6. Is it possible to repair OBDII code P189C in a 2014 GMC Sierra myself?

While some DIY enthusiasts may attempt to address code P189C themselves, it's recommended to seek professional help, especially if you are not experienced with transmission-related repairs.

7. How much does it typically cost to fix OBDII code P189C in a 2014 GMC Sierra?

The cost of repairing code P189C can vary depending on the root cause of the issue, but it may range from a couple of hundred dollars for simpler fixes to over a thousand dollars for more complex repairs involving transmission components.

8. Can a reset of the OBDII system clear code P189C in a 2014 GMC Sierra?

A simple reset of the OBDII system may temporarily clear the code, but if the underlying issue is not resolved, the code is likely to reappear once the problem is detected again.

9. Will driving in a particular way trigger OBDII code P189C in a 2014 GMC Sierra?

Driving habits may not directly trigger code P189C, but aggressive driving or prolonged driving with existing transmission issues can exacerbate the problem and cause the code to appear.

10. How can I prevent OBDII code P189C from occurring in my 2014 GMC Sierra in the future?

Regular maintenance, including checking for transmission fluid leaks, keeping up with fluid changes, and addressing any transmission-related issues promptly, can help prevent code P189C from occurring in the future.