P179B 2015 GMC Sierra Code - Transmission Range State Command Signal Message Counter Incorrect
Quick Answer
The P179B diagnostic trouble code for the 2015 GMC Sierra specifically refers to the Transmission Range State Command Signal Message Counter being Incorrect. Common causes include Faulty transmission range sensor, Wiring issues or loose connections, TCM 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
- P179B 2015 GMC Sierra indicates Transmission Range State Command Signal Message Counter Incorrect.
- Common causes
- Common causes include Faulty transmission range sensor, Wiring issues or loose connections, TCM 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.
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Code P179B 2015 GMC Sierra Description
The P179B diagnostic trouble code for the 2015 GMC Sierra specifically refers to the Transmission Range State Command Signal Message Counter being Incorrect. This code indicates that the vehicle's onboard computer has detected an issue with the signal communication related to the transmission range state command. In simpler terms, the transmission control module (TCM) is not receiving the correct number of signals or messages related to the transmission gear range, which can lead to a variety of performance issues.
Common Causes of P179B 2015 GMC Sierra
- Faulty transmission range sensor
- Wiring issues or loose connections
- TCM malfunction
- Software glitches in the TCM
- Low transmission fluid levels
Symptoms of P179B 2015 GMC Sierra
- Erratic shifting behavior
- Harsh or delayed gear changes
- Transmission slipping
- Limp mode activation
- Check Engine Light illuminated
How to Fix P179B 2015 GMC Sierra
- Begin by conducting a thorough diagnostic scan to retrieve the specific trouble codes and pinpoint the exact cause of the issue.
- Inspect the transmission range sensor and related wiring for any signs of damage or wear. Replace the sensor if necessary.
- Check and refill the transmission fluid to the proper level, as low levels can cause erratic shifting behavior.
- Clear the trouble codes from the TCM's memory and reset the system to see if the issue persists.
- If the problem persists, consider reprogramming or replacing the TCM to address any software or hardware issues.
Cost to Fix P179B 2015 GMC Sierra
The typical repair costs for addressing the P179B code on a 2015 GMC Sierra can vary depending on the specific cause of the issue. In general, the cost of parts such as a new transmission range sensor or TCM can range from $200 to $600, while labor costs can add another $100 to $300 to the total repair bill. Overall, the total cost for resolving this issue may range from $300 to $900, but it is advisable to consult with a trusted auto repair shop for a more accurate estimate based on the specific circumstances of the vehicle. Keep in mind that labor rates can vary, so it's essential to consider this when budgeting for repairs.
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Frequently Asked Questions about P179B 2015 GMC Sierra Code
1. What does the OBDII code P179B mean on a 2015 GMC Sierra?
The P179B code indicates an issue with the Transmission Range State Command Signal Message Counter, meaning there’s a communication or data mismatch in the transmission control system.
2. What are the common symptoms of code P179B in a 2015 GMC Sierra?
Symptoms may include erratic shifting, transmission stuck in one gear, the Check Engine Light illuminated, or reduced vehicle performance.
3. What causes the P179B code on a 2015 GMC Sierra?
Common causes include a faulty Transmission Control Module (TCM), wiring or connector issues, communication errors between modules, or software glitches.
4. Can I drive my 2015 GMC Sierra with the P179B code?
Driving with this code is not recommended as the transmission may not function properly, potentially causing further damage or unsafe driving conditions.
5. How do I diagnose the P179B code on my GMC Sierra?
Diagnosing involves using a scan tool to check for related codes, inspecting wiring and connectors, and testing the TCM for proper communication signals.
6. What repairs can fix the P179B code on a 2015 GMC Sierra?
Repairs may include replacing damaged wiring or connectors, updating the TCM software, or replacing the TCM if it’s faulty.
7. How much does it cost to repair the P179B code on a GMC Sierra?
Repair costs vary depending on the specific issue but can range from $100 for simple wiring repairs to $1,000 or more for TCM replacement.
8. Can a software update fix the P179B code on my 2015 GMC Sierra?
Yes, in some cases, a TCM software update can resolve the code if it’s caused by a programming or communication glitch.
9. Is the P179B code unique to the GMC Sierra?
No, the P179B code can appear in other GM vehicles using similar transmission systems, but specific symptoms and causes may vary.
10. What tools are needed to troubleshoot the P179B code?
You’ll need an advanced OBDII scan tool capable of reading transmission codes, a multimeter for electrical testing, and possibly manufacturer-specific diagnostic software.
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