P279B 2017 GMC Sierra Code - Four Wheel Drive Low Range Performance
Quick Answer
The diagnostic trouble code P279B for a 2017 GMC Sierra indicates a problem with the Four Wheel Drive Low Range Performance. Common causes include Faulty transfer case, Malfunctioning sensors or switches, Wiring issues. 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
- P279B 2017 GMC Sierra indicates Four Wheel Drive Low Range Performance .
- Common causes
- Common causes include Faulty transfer case, Malfunctioning sensors or switches, Wiring issues.
- 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 P279B 2017 GMC Sierra Description
The diagnostic trouble code P279B for a 2017 GMC Sierra indicates a problem with the Four Wheel Drive Low Range Performance. This code is typically triggered when the vehicle's control module detects that the performance of the low range function in the four-wheel-drive system is not operating within the expected parameters. This can lead to issues with engaging or disengaging the low range mode, which is essential for off-road driving and towing heavy loads.
Common Causes of P279B 2017 GMC Sierra
- Faulty transfer case
- Malfunctioning sensors or switches
- Wiring issues
- Control module malfunction
Symptoms of P279B 2017 GMC Sierra
- Difficulty shifting into or out of low range mode
- Reduced traction in off-road conditions
- Lack of power when towing heavy loads
- Dashboard warning lights related to the four-wheel-drive system
How to Fix P279B 2017 GMC Sierra
- Begin by conducting a thorough diagnostic scan to confirm the P279B code and identify the specific cause of the issue.
- Inspect the transfer case, sensors, switches, and wiring for any visible damage or signs of wear.
- Test the components of the four-wheel-drive system, such as the actuator and control module, to determine if they are functioning correctly.
- Replace any faulty components identified during the diagnostic process.
- Clear the trouble code from the vehicle's system and test the four-wheel-drive system to ensure that the low range mode is engaging and disengaging properly.
Cost to Fix P279B 2017 GMC Sierra
The typical repair costs for addressing the Four Wheel Drive Low Range Performance issue can vary depending on the specific cause of the problem and the cost of parts and labor. In general, the repair for this issue could range from $200 to $800, including parts and labor. It's important to note that diagnosis time and labor rates at auto repair shops can vary based on factors such as location, vehicle make and model, and engine type. It's advisable to check with local auto repair shops for a more accurate estimate of the repair costs.
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Frequently Asked Questions about P279B 2017 GMC Sierra Code
1. What does the OBDII code P279B mean on a 2017 GMC Sierra?
P279B indicates an issue with the Four-Wheel Drive (4WD) Low Range Performance, typically related to the transfer case or associated components.
2. What are common symptoms of code P279B in a 2017 GMC Sierra?
Common symptoms include the inability to shift into 4WD Low, a "Service 4WD" message on the dashboard, and potential reduced off-road performance.
3. What causes the P279B code in a 2017 GMC Sierra?
Possible causes include a malfunctioning transfer case control module, a faulty transfer case motor, damaged wiring or connectors, or low or contaminated transfer case fluid.
4. Can I drive my 2017 GMC Sierra with the P279B code active?
While the truck may still be drivable, you may lose access to 4WD Low functionality, which could limit off-road or towing capabilities.
5. How do I diagnose the P279B code on a 2017 GMC Sierra?
Diagnosis involves scanning for additional codes, visually inspecting wiring and connectors, testing the transfer case motor, and checking the transfer case fluid level and condition.
6. What repairs might fix the P279B code on a 2017 GMC Sierra?
Repairs could include replacing the transfer case motor, repairing wiring or connectors, updating or reprogramming the transfer case control module, or changing the transfer case fluid.
7. How much does it cost to fix code P279B on a 2017 GMC Sierra?
Repair costs vary, but replacing a transfer case motor might range from $300 to $700, while addressing wiring or module issues could vary widely depending on labor.
8. Can low or dirty transfer case fluid cause the P279B code?
Yes, low or contaminated transfer case fluid can impair the system's performance and trigger the P279B code.
9. Is a software update needed to resolve the P279B code on a 2017 GMC Sierra?
In some cases, the transfer case control module may need a software update to resolve the issue, but a mechanic will need to confirm this through diagnosis.
10. What tools are required to troubleshoot the P279B code on a 2017 GMC Sierra?
You’ll need an OBDII scanner, a multimeter for electrical tests, and basic tools to inspect the transfer case motor and wiring.
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