P279C 2014 Chevrolet Silverado Code - Four Wheel Drive Neutral 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
- P279C 2014 Chevrolet Silverado indicates Four Wheel Drive Neutral 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 P279C 2014 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 P279C 2014 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 P279C 2014 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 P279C 2014 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 P279C 2014 Chevrolet Silverado Code
1. What does the OBDII code P279C mean on a 2014 Chevrolet Silverado?
P279C indicates a "Four Wheel Drive Neutral Range Performance" issue, typically related to the transfer case system not functioning as expected.
2. What are the common symptoms of code P279C in a 2014 Chevrolet Silverado?
Symptoms may include the Four-Wheel Drive (4WD) system not engaging or disengaging properly, the 4WD warning light illuminating, or unusual noises from the transfer case.
3. What causes the P279C code to appear on a 2014 Chevrolet Silverado?
Common causes include a faulty transfer case shift motor, damaged wiring or connectors, a malfunctioning transfer case control module, or mechanical issues within the transfer case.
4. How can I diagnose the P279C code on my Silverado?
Start by scanning for other related codes, inspecting the wiring and connectors near the transfer case, testing the transfer case shift motor, and checking for mechanical binding in the transfer case.
5. Can driving with the P279C code damage my 2014 Silverado?
Yes, prolonged driving with this issue can cause damage to the transfer case or drivetrain components, as the 4WD system may not operate correctly.
6. How do I fix the P279C code on a 2014 Chevrolet Silverado?
Repairs may involve replacing the transfer case shift motor, repairing or replacing damaged wiring, updating or reprogramming the transfer case control module, or addressing internal transfer case issues.
7. Is the transfer case shift motor the most common issue for code P279C?
Yes, the transfer case shift motor is a common failure point for this code, but other components in the 4WD system should also be inspected.
8. Can a software update resolve the P279C code on my Silverado?
In some cases, a software update for the transfer case control module might resolve the issue, especially if the problem is related to incorrect programming.
9. How much does it cost to repair the P279C code on a 2014 Chevrolet Silverado?
Repair costs vary, but replacing the transfer case shift motor typically ranges from $300 to $600, while wiring repairs or control module updates may cost less.
10. Can I clear the P279C code without fixing the problem?
Clearing the code without addressing the underlying issue will likely cause the code to return, as the fault will persist until repaired.
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