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P189C 2018 Chevrolet Silverado Code - Transmission Range Command Message Performance

Quick Answer

The P189C diagnostic trouble code (DTC) for a 2018 Chevrolet Silverado relates to the Transmission Range Command Message Performance. Common causes include Faulty wiring or connectors between TCM and ECM, Malfunctioning TCM or ECM, Software glitch. 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 2018 Chevrolet Silverado indicates Transmission Range Command Message Performance.
Common causes
Common causes include Faulty wiring or connectors between TCM and ECM, Malfunctioning TCM or ECM, Software glitch.
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 13, 2024
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Code P189C 2018 Chevrolet Silverado Description

The P189C diagnostic trouble code (DTC) for a 2018 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 gear position selected by the driver. When this communication is compromised, it can lead to various issues with the vehicle's transmission system.

OBDII Code P189C 2018 Chevrolet Silverado - Transmission Range Command Message Performance
P189C 2018 Chevrolet Silverado Code - Transmission Range Command Message Performance

Common Causes of P189C 2018 Chevrolet Silverado

  1. Faulty wiring or connectors between TCM and ECM
  2. Malfunctioning TCM or ECM
  3. Software glitch
  4. Transmission range sensor issue

Symptoms of P189C 2018 Chevrolet Silverado

  1. Erratic shifting
  2. Harsh shifting
  3. Delayed engagement
  4. Transmission stuck in one gear
  5. Limp mode activation

How to Fix P189C 2018 Chevrolet Silverado

  1. Perform a thorough inspection of the wiring and connectors between the TCM and ECM.
  2. Check for any loose connections or corrosion and repair as necessary.
  3. Scan the TCM and ECM for any fault codes and address them accordingly.
  4. Test the transmission range sensor for proper operation and replace if necessary.
  5. Clear the DTC and perform a test drive to ensure the issue has been resolved.

Cost to Fix P189C 2018 Chevrolet Silverado

The typical repair costs for addressing the P189C code on a 2018 Chevrolet Silverado can vary depending on the specific cause of the issue. Generally, the cost of parts such as a new transmission range sensor or wiring harness can range from $100 to $500. Labor costs can vary, but most auto repair shops charge between $80 and $150 per hour for diagnostic time and repairs. Therefore, the total cost for resolving this issue could range from $200 to $800 or more, depending on the extent of the repairs needed. It is advisable to check with local auto repair shops for more accurate estimates based on your location and vehicle specifics.

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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 2018 Chevrolet Silverado Code

1. What are the common symptoms of OBDII code P189C in a 2018 Chevrolet Silverado?

- Common symptoms include transmission shifting issues, hesitation or jerking during gear changes, and the transmission slipping or not engaging properly.

2. What can cause the OBDII code P189C to appear in a 2018 Chevrolet Silverado?

- The code P189C is typically triggered by a malfunction in the transmission range command message performance, which could be caused by wiring issues, a faulty transmission range sensor, or a problem with the transmission control module.

3. How serious is OBDII code P189C in a 2018 Chevrolet Silverado?

- Code P189C can affect the performance and drivability of the vehicle, potentially leading to further transmission damage if left unresolved. It is recommended to address this issue promptly.

4. Can OBDII code P189C in a 2018 Chevrolet Silverado be fixed at home?

- Depending on the underlying cause, some DIY enthusiasts may be able to address code P189C by checking and repairing any damaged wiring, replacing the transmission range sensor, or reprogramming the transmission control module. However, complex transmission issues may require professional diagnosis and repair.

5. How can I diagnose OBDII code P189C in a 2018 Chevrolet Silverado?

- Diagnosing code P189C may involve using an OBDII scanner to retrieve the code and checking the transmission range sensor for proper operation. Additionally, inspecting the wiring harness for any damage or corrosion can help identify the issue.

6. Is it safe to continue driving with OBDII code P189C in a 2018 Chevrolet Silverado?

- It is not recommended to continue driving with code P189C present, as it can lead to further transmission problems and potentially unsafe driving conditions. It is best to have the issue addressed as soon as possible.

7. How much does it typically cost to repair OBDII code P189C in a 2018 Chevrolet Silverado?

- The cost of repairing code P189C can vary depending on the root cause of the issue. Repairs may range from a few hundred dollars for minor fixes like replacing a sensor to over a thousand dollars for more extensive transmission repairs.

8. Can a simple reset of the OBDII system clear code P189C in a 2018 Chevrolet Silverado?

- While clearing the code may temporarily turn off the check engine light, it will not fix the underlying issue causing code P189C. It is important to diagnose and address the root cause of the problem to prevent it from reoccurring.

9. Are there any recalls or technical service bulletins related to OBDII code P189C in a 2018 Chevrolet Silverado?

- It is recommended to check with the manufacturer or a certified Chevrolet dealership to inquire about any recalls or technical service bulletins related to code P189C in a 2018 Silverado. These resources may provide valuable information on known issues and potential solutions.

10. Will driving with OBDII code P189C in a 2018 Chevrolet Silverado affect fuel efficiency?

- Driving with code P189C may affect fuel efficiency due to the transmission not operating optimally, causing the engine to work harder than necessary. Resolving the issue can help improve fuel efficiency and overall vehicle performance.

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