AutoCodes – Generic – P179B

P179B 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 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.

Save to My Repairs My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 1,684

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
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

Code P179B 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 - Transmission Range State Command Signal Message Counter Incorrect - AutoCodes.com — P179B Code - Transmission Range State Command Signal Message Counter Incorrect

What does this mean?

What are the Possible Causes of the DTC P179B?

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?

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 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 code?

Need more information on how to fix the P179B code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P179B code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

P179B Buick — Transmission Range State Command Signal Message Counter Incorrect
P179B Cadillac — Transmission Range State Command Signal Message Counter Incorrect
P179B Chevrolet — Transmission Range State Command Signal Message Counter Incorrect
P179B GMC — Transmission Range State Command Signal Message Counter Incorrect

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 Code

1. What are common symptoms of OBDII code P179B?

The common symptoms of OBDII code P179B include issues with shifting gears, transmission slipping, and the vehicle going into limp mode.

2. What can cause the OBDII code P179B to appear?

The OBDII code P179B, Transmission Range State Command Signal Message Counter Incorrect, can be triggered by faulty transmission range sensor, wiring issues, or a malfunctioning transmission control module.

3. How serious is the OBDII code P179B?

The OBDII code P179B should be addressed promptly as it can lead to transmission problems and affect the overall drivability of the vehicle.

4. What should I do if I encounter the OBDII code P179B?

If you encounter the OBDII code P179B, it is recommended to have your vehicle diagnosed by a professional mechanic to pinpoint the exact cause of the issue.

5. Can I continue driving with the OBDII code P179B present?

It is not advisable to continue driving with the OBDII code P179B present as it can potentially cause further damage to the transmission.

6. How can the OBDII code P179B be repaired?

Repairing the OBDII code P179B involves diagnosing the root cause of the issue, which can range from replacing the transmission range sensor to repairing faulty wiring or addressing issues with the transmission control module.

7. Is it possible to reset the OBDII code P179B on my own?

While you can attempt to clear the OBDII code P179B using an OBDII scanner, it is crucial to address the underlying issue causing the code to prevent it from reoccurring.

8. How much does it cost to repair the OBDII code P179B?

The cost of repairing the OBDII code P179B can vary depending on the exact cause of the issue and the labor rates of the repair shop. It is recommended to obtain quotes from multiple mechanics for an accurate estimate.

9. Can a DIY enthusiast fix the OBDII code P179B?

Repairing the OBDII code P179B may require specialized knowledge and tools, making it more suitable for professional mechanics. However, DIY enthusiasts with experience in automotive repair may be able to tackle the issue with the right resources.

10. Will the OBDII code P179B cause my vehicle to fail an emissions test?

The OBDII code P179B can potentially cause your vehicle to fail an emissions test, as it indicates a malfunction in the transmission system. It is important to address the issue promptly to ensure your vehicle meets emissions standards.