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P189C 2017 GMC Sierra Code - Transmission Range Command Message Performance

Quick Answer

The P189C diagnostic trouble code (DTC) for a 2017 GMC Sierra indicates an issue with the transmission range command message performance. Common causes include Faulty wiring or connectors, Malfunctioning TCM, Transmission range sensor issues. 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 wiring or connectors, Malfunctioning TCM, Transmission range sensor issues.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 17, 2024
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Code P189C 2017 GMC Sierra Description

The P189C diagnostic trouble code (DTC) for a 2017 GMC Sierra indicates an issue with the transmission range command message performance. This code is typically triggered when the transmission control module (TCM) detects a discrepancy or fault in the communication signals related to the transmission range command. The transmission range command message is crucial for the TCM to accurately determine the gear position of the vehicle, allowing for proper shifting and overall transmission operation.

OBDII Code P189C 2017 GMC Sierra - Transmission Range Command Message Performance
P189C 2017 GMC Sierra Code - Transmission Range Command Message Performance

Common Causes of P189C 2017 GMC Sierra

  1. Faulty wiring or connectors
  2. Malfunctioning TCM
  3. Transmission range sensor issues
  4. Electrical interference or signal disruption
  5. Software glitches in the TCM

Symptoms of P189C 2017 GMC Sierra

  1. Harsh shifting
  2. Delayed shifting
  3. Erratic shifting patterns
  4. Transmission slipping
  5. Transmission getting stuck in a particular gear

How to Fix P189C 2017 GMC Sierra

  1. Begin by conducting a thorough inspection of the wiring harness and connectors associated with the transmission range sensor and TCM. Look for any visible damage, corrosion, or loose connections.
  2. Test the transmission range sensor to ensure it is functioning correctly. Replace the sensor if necessary.
  3. Check for any software updates or reprogramming that may be available for the TCM to address potential glitches.
  4. If the issue persists, consider replacing the TCM itself after confirming that all other components are in working order.
  5. Clear the DTC and perform a test drive to verify that the issue has been resolved.

Cost to Fix P189C 2017 GMC Sierra

The typical repair costs for addressing a P189C code on a 2017 GMC Sierra can range from $200 to $800, depending on the specific cause of the issue and the necessary repairs. This estimate includes parts and labor. It's important to note that diagnosis time and labor rates at auto repair shops can vary, so it's advisable to check with local shops for a more accurate estimate. Keep in mind that rates may be higher at dealerships or in metropolitan areas, while independent shops may offer more competitive pricing.

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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.

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