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P179B GMC Code - Transmission Range State Command Signal Message Counter Incorrect

Quick Answer

The P179B GMC code indicates that the Transmission Range State Command Signal Message Counter is incorrect. Common causes include Faulty transmission range sensor, Damaged wiring or connectors in the transmission range sensor circuit, Malfunctioning transmission control module (TCM). 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
P179B GMC indicates Transmission Range State Command Signal Message Counter Incorrect.
Common causes
Common causes include Faulty transmission range sensor, Damaged wiring or connectors in the transmission range sensor circuit, Malfunctioning transmission control module (TCM).
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 14, 2024
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Code P179B GMC Description

The P179B GMC code indicates that the Transmission Range State Command Signal Message Counter is incorrect. This means that there is a discrepancy in the signal communication between the transmission range sensor and the vehicle's computer system. The transmission range sensor is responsible for informing the vehicle's computer about the gear position, allowing the system to adjust shift points and optimize performance. When the message counter is incorrect, it can lead to issues with gear shifting, transmission performance, and overall drivability of the vehicle.

OBDII Code P179B GMC - Transmission Range State Command Signal Message Counter Incorrect
P179B GMC Code - Transmission Range State Command Signal Message Counter Incorrect

Common Causes of P179B GMC

  1. Faulty transmission range sensor
  2. Damaged wiring or connectors in the transmission range sensor circuit
  3. Malfunctioning transmission control module (TCM)
  4. Software issues within the vehicle's computer system

Symptoms of P179B GMC

  1. Erratic shifting patterns
  2. Harsh gear changes
  3. Transmission slipping
  4. Inability to shift gears
  5. Vehicle going into "limp mode"

How to Fix P179B GMC

  1. Perform a thorough diagnostic scan to retrieve the specific error codes and pinpoint the issue.
  2. Inspect the transmission range sensor and its wiring for any signs of damage or corrosion.
  3. Test the transmission range sensor's functionality using a multimeter to ensure it is sending accurate signals.
  4. Check the transmission control module (TCM) for any faults or software issues that may be causing the incorrect message counter.
  5. Clear the error codes, reset the TCM, and test drive the vehicle to ensure the issue has been resolved.

Cost to Fix P179B GMC

The typical repair costs for addressing the P179B GMC code can range from $200 to $500, depending on the exact cause of the issue and the labor rates at the auto repair shop. Parts such as a new transmission range sensor or wiring harness may need to be replaced, adding to the overall cost. It's important to note that diagnosis time and labor rates can vary, so it's advisable to check with local auto repair shops for a more accurate estimate based on your specific vehicle make and model.

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Information for Specific GMC Models

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 P179B GMC Code

1. What are the common symptoms of OBDII code P179B in a GMC vehicle?

- Common symptoms include erratic shifting, transmission slipping, and illumination of the check engine light.

2. What can cause the OBDII code P179B to appear in a GMC vehicle?

- The code P179B typically occurs due to a malfunction in the Transmission Range State Command Signal Message Counter.

3. How can I diagnose the OBDII code P179B in my GMC vehicle?

- To diagnose the code P179B, a professional diagnostic scan tool is needed to read the specific error codes stored in the vehicle's computer system.

4. What are some repair tips for fixing the OBDII code P179B in a GMC vehicle?

- Repair tips may include checking and repairing any wiring issues related to the transmission range sensor, ensuring proper connection of all transmission components, and resetting the fault codes after repairs are made.

5. Is it safe to continue driving my GMC vehicle with the OBDII code P179B present?

- It is not recommended to continue driving with the code P179B as it can lead to further damage to the transmission system if left unresolved.

6. Can a DIY enthusiast fix the OBDII code P179B issue in a GMC vehicle?

- While some DIY enthusiasts may have the skills to address the OBDII code P179B, it is recommended to seek professional help due to the complexity of transmission-related repairs.

7. How much does it typically cost to repair the OBDII code P179B in a GMC vehicle?

- The cost of repairing the code P179B can vary depending on the extent of the issue, but it may involve expenses for parts replacement, labor, and diagnostic services.

8. Will resetting the check engine light resolve the OBDII code P179B in a GMC vehicle?

- Resetting the check engine light may temporarily clear the code, but it is crucial to diagnose and address the underlying issue causing the code P179B for a permanent solution.

9. Are there any recalls or technical service bulletins related to the OBDII code P179B in GMC vehicles?

- It is recommended to check with a GMC dealership or online resources for any recalls or technical service bulletins related to the code P179B to stay informed about potential solutions.

10. How can I prevent the OBDII code P179B from reoccurring in my GMC vehicle?

- Regular maintenance, timely repairs of transmission components, and addressing any related issues promptly can help prevent the code P179B from reoccurring in a GMC vehicle.

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