P189C 2018 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 2018 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 2018 GMC Sierra Description
What are the Possible Causes of the DTC P189C 2018 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 2018 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 2018 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 2018 GMC Sierra Code
1. What are the common symptoms of OBDII code P189C in a 2018 GMC Sierra?
- Common symptoms include harsh shifting, transmission slipping, and the inability to shift gears smoothly.
2. What are the possible causes of OBDII code P189C in a 2018 GMC Sierra?
- Possible causes may include a faulty transmission range sensor, damaged wiring or connectors, or issues with the transmission control module.
3. How can I diagnose the OBDII code P189C in my 2018 GMC Sierra?
- Diagnosing this code typically involves using a scan tool to retrieve the specific fault codes and checking the transmission range sensor for proper operation.
4. Is it safe to continue driving my 2018 GMC Sierra with OBDII code P189C present?
- It is not recommended to continue driving with this code present, as it can lead to further damage to the transmission and potentially cause safety hazards.
5. Can I reset the OBDII code P189C in my 2018 GMC Sierra myself?
- While you can clear the code with a scan tool, it is essential to address the underlying issue causing the code to prevent it from reoccurring.
6. How much does it typically cost to repair OBDII code P189C in a 2018 GMC Sierra?
- The cost of repair can vary depending on the exact cause of the code, but it may range from a simple sensor replacement to more extensive transmission repairs.
7. Are there any DIY tips for fixing OBDII code P189C in a 2018 GMC Sierra?
- DIY tips may include checking and cleaning the transmission range sensor connectors, inspecting for damaged wiring, and ensuring proper transmission fluid levels.
8. Will OBDII code P189C in my 2018 GMC Sierra affect fuel efficiency?
- Yes, this code can affect fuel efficiency as it may lead to improper shifting and increased strain on the transmission components.
9. How long does it typically take to repair OBDII code P189C in a 2018 GMC Sierra?
- The repair time can vary depending on the exact cause of the code and the complexity of the repair, but it may range from a few hours to a full day.
10. Can a regular mechanic fix OBDII code P189C in a 2018 GMC Sierra, or is a specialized technician required?
- A regular mechanic with experience in diagnosing and repairing transmission issues should be able to address OBDII code P189C in a 2018 GMC Sierra.
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