P279A 2015 Chevrolet Silverado Code - Four Wheel Drive High Range Performance
Quick Answer
The Engine Control Module (ECM) uses the following two ways to determine if the transfer case is in 4WD Low, 4WD High, or Neutral. Common causes include Reprogram Engine Control Module (ECM), Faulty Engine Control Module, Engine Control Module harness is open or shorted. 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
- P279A 2015 Chevrolet Silverado indicates Four Wheel Drive High Range Performance.
- Common causes
- Common causes include Reprogram Engine Control Module (ECM), Faulty Engine Control Module, Engine Control Module harness is open or shorted.
- 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.
Code P279A 2015 Chevrolet Silverado Description
1. The first way is to compare the transmission output speed sensor to the transfer case output speed sensor in order to calculate the transfer case range.
2. The second way is to use a LAN message sent by the transfer case shift control module to the ECM.
The ECM uses this message to determine motor torque required and transmission shifting.
The internal fault detection is handled inside the control module. No external circuit diagnosis is involved.
If the first way and second way of determining transfer case range do not match while in 4WD Low, 4WD High or Neutral, then the Diagnostic Trouble Code (DTC) is set.
What are the Possible Causes of the DTC P279A 2015 Chevrolet Silverado?
- Reprogram Engine Control Module (ECM)
- Faulty Engine Control Module
- Engine Control Module harness is open or shorted
- Engine Control Module circuit poor electrical connection
- Transmission internal mechanical problems
How to Fix the DTC P279A 2015 Chevrolet Silverado?
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 P279A 2015 Chevrolet Silverado 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.
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Frequently Asked Questions about P279A 2015 Chevrolet Silverado Code
1. What does the OBDII code P279A mean on a 2015 Chevrolet Silverado?
P279A indicates an issue with the Four-Wheel Drive (4WD) High Range Performance, meaning the system is not functioning as expected.
2. What are the common symptoms of code P279A in a 2015 Chevrolet Silverado?
Symptoms include difficulty engaging 4WD high, a 4WD warning light on the dashboard, reduced traction, or unusual noises from the transfer case.
3. What causes the P279A code to appear in a 2015 Chevy Silverado?
Common causes include a malfunctioning transfer case motor, faulty 4WD control module, wiring or connector issues, or internal transfer case damage.
4. Can I still drive my 2015 Silverado with the P279A code active?
Yes, but 4WD high range functionality may be compromised, which can reduce performance in off-road or slippery conditions.
5. How can I diagnose the P279A code on my Silverado?
Start by inspecting the transfer case motor and wiring for damage, check for loose or corroded connectors, and use a scan tool to monitor real-time data from the 4WD system.
6. How do I fix the P279A code on a 2015 Chevrolet Silverado?
Repairs may include replacing the transfer case motor, repairing damaged wiring, reprogramming the 4WD control module, or addressing internal transfer case issues.
7. What tools are needed to troubleshoot the P279A code?
You’ll need an OBDII scanner capable of reading 4WD system data, a multimeter for testing electrical circuits, and potentially basic tools for inspecting the transfer case.
8. Can a software update fix the P279A code?
In some cases, reprogramming or updating the 4WD control module software can resolve the issue if it’s caused by a software glitch.
9. How much does it cost to fix the P279A code on a 2015 Silverado?
Repair costs vary but can range from $150 for simple wiring fixes to over $1,000 if the transfer case motor or internal components need replacement.
10. What happens if I ignore the P279A code in my Silverado?
Ignoring the code can lead to worsened transfer case damage, reduced off-road capability, and potential safety risks in low-traction conditions.
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