P189C 2016 GMC Sierra Code - Transmission Range Command Message Performance
Quick Answer
The P189C diagnostic trouble code (DTC) for a 2016 GMC Sierra indicates an issue with the transmission range command message performance. Common causes include Faulty transmission range sensor, Wiring or connector issues, TCM or ECM malfunction. 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 2016 GMC Sierra indicates Transmission Range Command Message Performance.
- Common causes
- Common causes include Faulty transmission range sensor, Wiring or connector issues, TCM or ECM malfunction.
- 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 P189C 2016 GMC Sierra Description
The P189C diagnostic trouble code (DTC) for a 2016 GMC Sierra indicates an issue with the transmission range command message performance. This code is specifically related to the communication between the transmission control module (TCM) and the engine control module (ECM) regarding the transmission range selection. The TCM sends a signal to the ECM indicating the selected gear range (Park, Reverse, Neutral, Drive, etc.), and if the message is not received or is incorrect, the P189C code is triggered.
Common Causes of P189C 2016 GMC Sierra
- Faulty transmission range sensor
- Wiring or connector issues
- TCM or ECM malfunction
- Software glitches
- Electrical interference or communication errors
Symptoms of P189C 2016 GMC Sierra
- Harsh or delayed shifting
- Transmission slipping
- Inability to shift gears
- Limp mode activation
- Illumination of the Check Engine Light
How to Fix P189C 2016 GMC Sierra
- Perform a comprehensive diagnostic scan to retrieve the exact fault codes and pinpoint the issue.
- Inspect the wiring harness and connectors for any damage or corrosion. Repair or replace as necessary.
- Test the transmission range sensor and replace if faulty.
- Check the TCM and ECM for proper operation and reprogram or replace as needed.
- Clear the codes, reset the system, and test drive the vehicle to ensure the problem is resolved.
Cost to Fix P189C 2016 GMC Sierra
The cost of repairing a P189C code on a 2016 GMC Sierra can vary depending on the exact cause of the issue. In general, the parts required for this repair, such as a transmission range sensor or TCM/ECM, can range from $200 to $800. Labor costs typically range from $100 to $300, depending on the shop's hourly rate and the complexity of the repair. Overall, the total repair cost could be anywhere from $300 to $1100. It's recommended to consult with a qualified mechanic or dealership for a more accurate estimate based on your specific vehicle and location.
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Frequently Asked Questions about P189C 2016 GMC Sierra Code
1. What does the OBDII code P189C mean on a 2016 GMC Sierra?
The P189C code indicates a "Transmission Range Command Message Performance" issue, meaning there’s a problem with the communication or performance of the transmission range signal.
2. What are the common symptoms of the P189C code on a 2016 GMC Sierra?
Symptoms may include transmission shifting issues, the truck being stuck in a single gear, the check engine light turning on, or erratic gear changes.
3. What causes the P189C code to appear on a 2016 GMC Sierra?
Common causes include faulty transmission range sensors, wiring issues, poor electrical connections, a malfunctioning transmission control module (TCM), or software glitches.
4. Can driving with the P189C code damage my GMC Sierra?
Driving with this code can lead to further transmission issues or unsafe driving conditions if the vehicle fails to shift properly. It's best to address it promptly.
5. How do you diagnose the P189C code on a 2016 GMC Sierra?
Diagnosis involves using a scan tool to confirm the code, inspecting the transmission range sensor and related wiring, and testing the TCM for proper operation.
6. What repairs might fix the P189C code on a 2016 GMC Sierra?
Repairs can include replacing the transmission range sensor, repairing or replacing damaged wiring, updating the TCM software, or replacing the TCM if faulty.
7. How much does it cost to fix the P189C code on a 2016 GMC Sierra?
Repair costs can vary widely, typically ranging from $150 to $600, depending on whether parts like the transmission range sensor or TCM need replacement.
8. Can a software update resolve the P189C code on a 2016 GMC Sierra?
Yes, in some cases, a TCM software update from the dealership can fix the issue if it’s caused by a programming or communication glitch.
9. Will resetting the check engine light clear the P189C code permanently?
Resetting the light may clear the code temporarily, but the issue will return if the underlying problem is not resolved.
10. Is the P189C code related to transmission fluid levels?
While not directly related, low or contaminated transmission fluid can contribute to shifting issues and should be checked as part of the diagnosis.
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