P279B 2015 Chevrolet Silverado Code - Four Wheel Drive Low 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
- P279B 2015 Chevrolet Silverado indicates Four Wheel Drive Low 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 P279B 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 P279B 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 P279B 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 P279B 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 P279B 2015 Chevrolet Silverado Code
1. What does the OBDII code P279B mean on a 2015 Chevrolet Silverado?
P279B indicates a "Four-Wheel Drive Low Range Performance" issue, meaning the system has detected a problem with the low-range functionality of the transfer case.
2. What are the common symptoms of code P279B on a Chevy Silverado?
Symptoms may include the "Check Engine" light turning on, failure to engage or disengage 4WD Low, grinding noises from the transfer case, or limited off-road capability.
3. What causes the P279B code to appear?
Possible causes include a malfunctioning transfer case motor, damaged wiring or connectors, a faulty transfer case control module, or internal transfer case mechanical issues.
4. Can driving with the P279B code damage my Silverado?
Driving with this code may limit 4WD functionality, especially in off-road or slippery conditions, but continued driving without repair could lead to further damage to the transfer case system.
5. How do I diagnose the P279B code on my Chevy Silverado?
Start by using an OBDII scanner to confirm the code, then inspect the transfer case motor, wiring, and connectors for visible damage. Test the functionality of the transfer case motor and control module if necessary.
6. How do I fix the P279B code on a 2015 Chevrolet Silverado?
Repairs may involve replacing a damaged transfer case motor, repairing or replacing faulty wiring or connectors, reprogramming the transfer case control module, or rebuilding the transfer case if internal damage is found.
7. How much does it cost to repair the P279B code?
Repair costs vary depending on the issue, ranging from $150–$400 for replacing a transfer case motor to $1,000 or more for major transfer case repairs.
8. Can a software update fix the P279B code?
In some cases, a software update for the transfer case control module may resolve the issue if the problem is related to incorrect system calibration.
9. How can I prevent the P279B code from occurring again?
Regular maintenance of the transfer case, including fluid changes and inspecting the motor and wiring for wear, can help prevent this code from recurring.
10. Do I need to use a professional mechanic to fix the P279B code?
While basic inspections can be done at home, diagnosing and repairing transfer case issues often require specialized tools and expertise, so consulting a professional is recommended.
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