AutoCodes – GMC – P179B 2017 GMC Sierra

P179B 2017 GMC Sierra Code - Transmission Range State Command Signal Message Counter Incorrect

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: P179B 2017 GMC Sierra indicates Transmission Range State Command Signal Message Counter Incorrect.
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.

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Code Popularity 182

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Sep 29, 2022

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P179B 2017 GMC Sierra Description

Control modules connected to the serial data circuits monitor the communication during normal vehicle operation. Operating information and commands are exchanged among the control modules. Each module on the serial data circuit maintains a transmit error counter and a receive error counter. The counter values increase with detected errors and decrease with error-free messages. The Diagnostic Trouble Code (DTC) will be set when the Transmission Range State Command Signal Message Counter is Incorrect.

OBDII Code P179B 2017 GMC Sierra - Transmission Range State Command Signal Message Counter Incorrect - AutoCodes.com — P179B 2017 GMC Sierra Code - Transmission Range State Command Signal Message Counter Incorrect

What does this mean?

What are the Possible Causes of the DTC P179B 2017 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 P179B 2017 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 P179B 2017 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.

Need more information about the P179B 2017 GMC Sierra code?

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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 P179B 2017 GMC Sierra Code

1. What are the common symptoms of OBDII code P179B in a 2017 GMC Sierra?

- Common symptoms may include issues with shifting gears, transmission slipping, and the vehicle going into limp mode.

2. What does the OBDII code P179B on a 2017 GMC Sierra mean?

- The code indicates that the Transmission Range State Command Signal Message Counter is incorrect, potentially affecting the transmission's operation.

3. What are the possible causes of OBDII code P179B in a 2017 GMC Sierra?

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

4. How can I diagnose OBDII code P179B in my 2017 GMC Sierra?

- Diagnosis typically involves using a diagnostic scanner to retrieve the code, checking the transmission range sensor, inspecting wiring connections, and performing a software update if necessary.

5. Can I continue driving my 2017 GMC Sierra with OBDII code P179B?

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

6. How can I reset OBDII code P179B on my 2017 GMC Sierra?

- Resetting the code can be done with a diagnostic scanner by clearing the code after addressing the underlying issue causing it.

7. Is it safe to ignore OBDII code P179B in a 2017 GMC Sierra?

- Ignoring the code can lead to more serious transmission problems and potential damage, so it is best to address the issue promptly.

8. Can OBDII code P179B in a 2017 GMC Sierra be fixed without professional help?

- While some DIYers may be able to address simple causes like loose connections, more complex issues may require professional diagnosis and repair.

9. What are the repair options for OBDII code P179B in a 2017 GMC Sierra?

- Repair options may include replacing the transmission range sensor, repairing wiring or connectors, updating software, or replacing the transmission control module.

10. How much does it cost to fix OBDII code P179B in a 2017 GMC Sierra?

- The cost of repair can vary depending on the underlying cause and the extent of the repairs needed, so it is advisable to obtain estimates from a qualified mechanic.