P279C 2017 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 2017 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 2017 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 2017 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 2017 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 2017 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 2017 Chevrolet Silverado Code
1. What does the OBDII code P279C mean for a 2017 Chevrolet Silverado?
P279C indicates an issue with the Four-Wheel Drive (4WD) Neutral Range Performance, meaning the transfer case system is not functioning as expected when shifting into or operating in neutral.
2. What are the common symptoms of the P279C code?
Symptoms may include the 4WD system not engaging properly, the transfer case stuck in neutral, warning lights on the dashboard, or the vehicle failing to shift into or out of 4WD modes.
3. What causes the P279C code on a 2017 Chevrolet Silverado?
Possible causes include faulty transfer case motor or encoder, damaged wiring or connectors, a malfunctioning transfer case control module (TCCM), or mechanical issues within the transfer case.
4. Can I drive my 2017 Silverado with the P279C code?
Driving with this code may be risky if the transfer case is stuck in neutral or if the 4WD system is malfunctioning, potentially leading to a loss of traction or drivability issues.
5. How is the P279C code diagnosed?
A mechanic will typically scan for codes, inspect the transfer case motor and wiring, test the transfer case control module, and check for mechanical damage inside the transfer case.
6. What repairs can fix the P279C code?
Repairs may involve replacing the transfer case motor or encoder, repairing damaged wiring, reprogramming or replacing the transfer case control module, or servicing the transfer case.
7. How much does it cost to repair the P279C code on a 2017 Chevrolet Silverado?
Repair costs can vary widely but may range from $150 for minor wiring repairs to over $1,000 if the transfer case motor or module needs replacement.
8. Can a low battery cause the P279C code?
Yes, a weak or low battery can disrupt communication between the transfer case control module and the motor, potentially triggering this code.
9. How can I prevent the P279C code from occurring again?
Regular maintenance of the 4WD system, checking for worn or damaged wiring, and keeping the transfer case fluid at the proper level can help prevent the issue.
10. Does the P279C code require reprogramming the transfer case control module?
In some cases, reprogramming the TCCM may resolve the issue if the problem is related to software glitches or incorrect calibration.
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