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P1775 2018 GMC Sierra Code - Transmission Range Request Signal Message Counter Incorrect

Quick Answer

The P1775 diagnostic trouble code (DTC) for a 2018 GMC Sierra indicates that the Transmission Range Request Signal Message Counter is incorrect. Common causes include Faulty transmission range sensor, Wiring or connection issues between the transmission range sensor and TCM, TCM software 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
P1775 2018 GMC Sierra indicates Transmission Range Request Signal Message Counter Incorrect.
Common causes
Common causes include Faulty transmission range sensor, Wiring or connection issues between the transmission range sensor and TCM, TCM software 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.
What is this?
Table of contents Created and updated by William Orellana on Sep 17, 2024
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Code P1775 2018 GMC Sierra Description

The P1775 diagnostic trouble code (DTC) for a 2018 GMC Sierra indicates that the Transmission Range Request Signal Message Counter is incorrect. This code typically points to a communication issue within the transmission control module (TCM) or the transmission range sensor. The transmission range sensor is responsible for sending signals to the TCM to inform it of the gear position selected by the driver. When the message counter is incorrect, it means that the TCM is not receiving the expected number of signals from the transmission range sensor, leading to confusion in gear selection and potential transmission issues.

OBDII Code P1775 2018 GMC Sierra - Transmission Range Request Signal Message Counter Incorrect
P1775 2018 GMC Sierra Code - Transmission Range Request Signal Message Counter Incorrect

Common Causes of P1775 2018 GMC Sierra

  1. Faulty transmission range sensor
  2. Wiring or connection issues between the transmission range sensor and TCM
  3. TCM software malfunction
  4. Electrical issues within the transmission control system
  5. Mechanical issues within the transmission itself

Symptoms of P1775 2018 GMC Sierra

  1. Erratic shifting or difficulty engaging gears
  2. Transmission slipping or not shifting
  3. Limp mode activated
  4. Check Engine Light illuminated
  5. Reduced fuel efficiency

How to Fix P1775 2018 GMC Sierra

  1. Begin by conducting a thorough inspection of the transmission range sensor and its wiring harness for any signs of damage or corrosion.
  2. Test the transmission range sensor using a multimeter to ensure it is sending the correct signals to the TCM.
  3. Check the TCM for any software updates or reprogramming that may be necessary to address the message counter issue.
  4. Inspect the transmission control system for any loose connections or damaged components that could be affecting communication.
  5. If necessary, replace the transmission range sensor or repair any damaged wiring to restore proper communication between the sensor and TCM.

Cost to Fix P1775 2018 GMC Sierra

The typical repair costs for addressing a P1775 code on a 2018 GMC Sierra can vary depending on the specific cause of the issue. In general, replacing a transmission range sensor can cost between $150 and $300, while addressing wiring or connection issues may range from $100 to $200. TCM software updates or reprogramming can cost around $100 to $150. Labor costs at auto repair shops typically range from $80 to $150 per hour, so the total repair cost can vary based on the time required for diagnosis and repair. It's recommended to consult with a professional mechanic for a more accurate estimate based on the specific circumstances of the vehicle.

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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 P1775 2018 GMC Sierra Code

1. What are the common symptoms of OBDII code P1775 on a 2018 GMC Sierra?

- Common symptoms include harsh shifting, transmission slipping, engine stalling, and illuminated check engine light.

2. What does the OBDII code P1775 "Transmission Range Request Signal Message Counter Incorrect" mean for a 2018 GMC Sierra?

- This code indicates that the transmission control module has detected an issue with the signal message counter related to the transmission range request.

3. What are the possible causes of OBDII code P1775 on a 2018 GMC Sierra?

- Possible causes include a faulty transmission range sensor, damaged wiring or connectors, software issues, or a malfunctioning transmission control module.

4. How can I diagnose the OBDII code P1775 on my 2018 GMC Sierra?

- Diagnosing this code typically involves using a scan tool to retrieve the specific details of the code, checking the transmission range sensor, inspecting wiring for damage, and verifying proper module communication.

5. Is it safe to continue driving with OBDII code P1775 on a 2018 GMC Sierra?

- It is not recommended to drive the vehicle with this code present, as it can lead to transmission issues and potential safety hazards. Seek professional diagnosis and repair promptly.

6. Can I reset the OBDII code P1775 on my 2018 GMC Sierra by disconnecting the battery?

- While disconnecting the battery may clear the code temporarily, it is not a permanent solution. The underlying issue causing the code needs to be addressed for proper repair.

7. How much does it typically cost to repair OBDII code P1775 on a 2018 GMC Sierra?

- Repair costs can vary depending on the exact cause of the code and the necessary parts and labor involved. It is recommended to consult a mechanic for an accurate estimate.

8. Can a DIY enthusiast fix OBDII code P1775 on a 2018 GMC Sierra?

- Repairing this code may require advanced diagnostic tools and technical knowledge of transmission systems. It is best left to experienced mechanics to ensure proper diagnosis and repair.

9. Will OBDII code P1775 affect the fuel efficiency of my 2018 GMC Sierra?

- Yes, this code can potentially affect fuel efficiency due to transmission issues causing improper shifting and engine performance. Addressing the code promptly can help maintain optimal fuel economy.

10. How long does it usually take to repair OBDII code P1775 on a 2018 GMC Sierra?

- The repair time can vary based on the exact cause of the code and the complexity of the fix. It is advisable to consult with a professional technician for an accurate timeframe.

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