P279B 2016 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 2016 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 2016 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 2016 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 2016 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 2016 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 2016 Chevrolet Silverado Code
1. What does the OBDII code P279B mean on a 2016 Chevrolet Silverado?
P279B indicates an issue with the Four-Wheel Drive (4WD) Low Range Performance, meaning the system is not engaging or functioning as expected.
2. What are the common symptoms of the P279B code?
Symptoms may include the 4WD Low mode failing to engage, warning lights on the dashboard (such as the Check Engine Light or 4WD indicator), and reduced off-road performance.
3. What causes the P279B code to appear?
Common causes include a malfunctioning transfer case motor, faulty 4WD control module, damaged wiring or connectors, or mechanical issues within the transfer case.
4. Can driving with the P279B code damage my 2016 Chevrolet Silverado?
Driving in standard 4WD or 2WD mode is generally safe, but prolonged use without addressing the issue could lead to further damage to the transfer case or drivetrain components.
5. How can I diagnose the P279B code?
Use an OBDII scanner to confirm the code, then inspect the transfer case motor, 4WD control module, and related wiring for damage or failure.
6. How do I fix the P279B code on my Silverado?
Repairs may include replacing a faulty transfer case motor, repairing damaged wiring, reprogramming the 4WD control module, or servicing the transfer case if it has internal issues.
7. Can a low transfer case fluid level cause the P279B code?
Yes, insufficient or contaminated transfer case fluid can lead to mechanical problems and trigger the code. Always check and replace the fluid as needed.
8. How much does it cost to repair the P279B code?
The repair cost depends on the root cause, ranging from $150 for wiring repairs to $1,000 or more for transfer case motor replacement or internal repairs.
9. Can I clear the P279B code without fixing it?
You can clear the code with an OBDII scanner, but it will likely return unless the underlying issue is repaired.
10. Does the P279B code affect regular 4WD High mode?
In some cases, 4WD High may still function normally, but issues with 4WD Low can signal broader problems that could eventually impact other modes.
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