P189C 2016 GMC Sierra Code - Transmission Range Command Message Performance
Quick Answer
Control modules connected to the serial data circuits monitor the communication during normal vehicle operation. Common causes include Faulty Transmission Control Module (TCM), Transmission Control Module harness is open or shorted, Transmission Control Module circuit poor electrical connection. 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 Control Module (TCM), Transmission Control Module harness is open or shorted, Transmission Control Module circuit poor electrical connection.
- 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.
Code P189C 2016 GMC Sierra Description
What are the Possible Causes of the DTC P189C 2016 GMC Sierra?
- Faulty Transmission Control Module (TCM)
- Transmission Control Module harness is open or shorted
- Transmission Control Module circuit poor electrical connection
How to Fix the DTC P189C 2016 GMC Sierra?
Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P189C 2016 GMC Sierra code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.
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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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