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P189C 2017 Chevrolet Silverado Code - Transmission Range Command Message Performance

Quick Answer

The P189C diagnostic trouble code (DTC) for a 2017 Chevrolet Silverado relates to the transmission range command message performance. Common causes include Faulty transmission range sensor, Wiring issues or loose connections between TCM and ECM, Software glitches in the TCM or ECM. 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 Chevrolet Silverado indicates Transmission Range Command Message Performance.
Common causes
Common causes include Faulty transmission range sensor, Wiring issues or loose connections between TCM and ECM, Software glitches in the TCM or ECM.
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 18, 2024
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Code P189C 2017 Chevrolet Silverado Description

The P189C diagnostic trouble code (DTC) for a 2017 Chevrolet Silverado relates to the transmission range command message performance. This code indicates that there is a problem with the communication between the transmission control module (TCM) and the engine control module (ECM) regarding the transmission range command. The transmission range command message is crucial for the proper operation of the transmission, as it informs the TCM of the desired gear selection from the driver. When this communication is compromised, it can lead to issues with gear shifting, engine performance, and overall drivability of the vehicle.

OBDII Code P189C 2017 Chevrolet Silverado - Transmission Range Command Message Performance
P189C 2017 Chevrolet Silverado Code - Transmission Range Command Message Performance

Common Causes of P189C 2017 Chevrolet Silverado

  1. Faulty transmission range sensor
  2. Wiring issues or loose connections between TCM and ECM
  3. Software glitches in the TCM or ECM
  4. Malfunctioning TCM or ECM
  5. Electrical interference or signal disruption

Symptoms of P189C 2017 Chevrolet Silverado

  1. Harsh shifting between gears
  2. Delayed gear engagement
  3. Transmission staying in one gear
  4. Limp mode activation
  5. Check Engine Light illuminated

How to Fix P189C 2017 Chevrolet Silverado

  1. Perform a thorough diagnostic scan to confirm the P189C code and identify any other related codes.
  2. Inspect the transmission range sensor and its wiring for any damage or corrosion. Replace if necessary.
  3. Check the connections between the TCM and ECM for tightness and corrosion. Clean or repair connections as needed.
  4. Update the software in the TCM and ECM to the latest version to address any known issues.
  5. If the issue persists, replace the TCM or ECM as a last resort.

Cost to Fix P189C 2017 Chevrolet Silverado

The cost of repairing a P189C code on a 2017 Chevrolet Silverado can vary depending on the specific cause of the issue. On average, the parts for this repair can range from $100 to $500, with labor costs adding an additional $100 to $300. Overall, the total repair cost could fall between $200 and $800. It's important to note that diagnostic time and labor rates at auto repair shops can fluctuate, so it's recommended to obtain quotes from multiple sources to get an accurate estimate.

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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 Chevrolet Silverado Code

1. What are the common symptoms of OBDII code P189C in a 2017 Chevrolet Silverado?

The common symptoms of code P189C include transmission shifting issues, hesitation or jerking during gear changes, and the illumination of the Check Engine light.

2. What does the OBDII code P189C indicate in a 2017 Chevrolet Silverado?

Code P189C indicates a transmission range command message performance issue in the 2017 Chevrolet Silverado, specifically related to the communication between the transmission control module and the engine control module.

3. What are the possible causes of OBDII code P189C in a 2017 Chevrolet Silverado?

Possible causes of code P189C include faulty wiring or connectors in the transmission range sensor circuit, a malfunctioning transmission range sensor, issues with the transmission control module, or communication errors between various control modules.

4. How can I diagnose OBDII code P189C in my 2017 Chevrolet Silverado?

Diagnosing code P189C involves using a diagnostic scanner to retrieve the code and then performing a thorough inspection of the transmission range sensor circuit, connectors, and related components to identify any faults or issues.

5. Can I continue driving my 2017 Chevrolet Silverado with OBDII code P189C?

It is not recommended to continue driving with code P189C present, as it can lead to further transmission problems and potentially cause damage. It is advised to address the issue promptly to prevent any potential safety hazards.

6. How can I repair OBDII code P189C in my 2017 Chevrolet Silverado?

Repairing code P189C may involve repairing or replacing damaged wiring or connectors in the transmission range sensor circuit, replacing the transmission range sensor if faulty, or addressing any communication issues between control modules.

7. Is it necessary to reset the OBDII code P189C after repairs in a 2017 Chevrolet Silverado?

After making repairs to address code P189C, it is recommended to clear the code using a diagnostic scanner to reset the Check Engine light and ensure the issue has been successfully resolved.

8. Can weather conditions affect the occurrence of OBDII code P189C in a 2017 Chevrolet Silverado?

Extreme weather conditions or exposure to moisture can sometimes cause electrical issues that may trigger code P189C. It is important to keep the vehicle's electrical components well-maintained to prevent such problems.

9. How long does it typically take to repair OBDII code P189C in a 2017 Chevrolet Silverado?

The repair time for code P189C can vary depending on the specific cause of the issue and the complexity of the repair. In some cases, it may be a relatively quick fix, while in others, it may require more extensive troubleshooting.

10. Should I seek professional help to repair OBDII code P189C in my 2017 Chevrolet Silverado?

If you are not familiar with diagnosing and repairing transmission-related issues, it is recommended to seek the assistance of a qualified mechanic or dealership to properly address and resolve code P189C in your 2017 Chevrolet Silverado.

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