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Engine-Codes – GMC – P189C 2014 GMC Sierra

P189C 2014 GMC Sierra Code - Transmission Range Command Message Performance

Quick Answer

The P189C diagnostic trouble code for a 2014 GMC Sierra indicates an issue with the Transmission Range Command Message Performance. Common causes include Faulty transmission range sensor, Malfunctioning transmission control module, Wiring 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 2014 GMC Sierra indicates Transmission Range Command Message Performance.
Common causes
Common causes include Faulty transmission range sensor, Malfunctioning transmission control module, Wiring 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 07, 2024
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Code P189C 2014 GMC Sierra Description

The P189C diagnostic trouble code for a 2014 GMC Sierra indicates an issue with the Transmission Range Command Message Performance. This code suggests that there is a problem with the communication between the transmission range sensor and the transmission control module. The transmission range sensor is responsible for detecting the gear position of the transmission, allowing the transmission control module to make necessary adjustments for optimal performance. When this communication is compromised, it can lead to various issues with the vehicle's transmission system.

OBDII Code P189C 2014 GMC Sierra - Transmission Range Command Message Performance
P189C 2014 GMC Sierra Code - Transmission Range Command Message Performance

Common Causes of P189C 2014 GMC Sierra

  1. Faulty transmission range sensor
  2. Malfunctioning transmission control module
  3. Wiring issues
  4. Poor connection between sensor and module
  5. Electrical problems

Symptoms of P189C 2014 GMC Sierra

  1. Harsh or delayed shifting
  2. Transmission getting stuck in a specific gear
  3. Issues with acceleration or deceleration
  4. Check Engine Light illuminated
  5. Reduced fuel efficiency

How to Fix P189C 2014 GMC Sierra

  1. Diagnose the specific cause of the issue using a scan tool to retrieve the fault codes and perform a thorough inspection of the transmission range sensor and control module.
  2. Replace the faulty transmission range sensor or transmission control module, if necessary.
  3. Check and repair any damaged wiring or connections related to the transmission range command message.
  4. Clear the fault codes and reset the transmission control module to ensure proper communication between the sensor and module.
  5. Test drive the vehicle to confirm that the issue has been resolved and ensure proper transmission operation.

Cost to Fix P189C 2014 GMC Sierra

** The typical repair costs for addressing a P189C code on a 2014 GMC Sierra can vary depending on the specific cause of the issue and the required parts and labor. In general, the cost of replacing a transmission range sensor or transmission control module can range from $200 to $600, not including labor costs. The labor rates at auto repair shops can vary, typically ranging between $80 and $150 per hour. It is recommended to consult with a professional mechanic to get a more accurate estimate 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 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.

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