AutoCodes – Chevrolet – P279C 2015 Chevrolet Silverado

P279C 2015 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 2015 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.

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Code Popularity 339

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Aug 29, 2022

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P279C 2015 Chevrolet Silverado Description

The Engine Control Module (ECM) uses the following two ways to determine if the transfer case is in 4WD Low, 4WD High, or Neutral.
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.

OBDII Code P279C 2015 Chevrolet Silverado - Four Wheel Drive Neutral Range Performance - AutoCodes.com — P279C 2015 Chevrolet Silverado Code - Four Wheel Drive Neutral Range Performance

What does this mean?

What are the Possible Causes of the DTC P279C 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 P279C 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 P279C 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.

Need more information about the P279C 2015 Chevrolet Silverado code?

Need more information on how to fix the P279C 2015 Chevrolet Silverado code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P279C 2015 Chevrolet Silverado code diagnosed by a professional: Find a repair shop in your area

About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P279C 2015 Chevrolet Silverado Code

1. What are the common symptoms of OBDII code P279C in a 2015 Chevrolet Silverado?

- Common symptoms include difficulty shifting into or out of four-wheel drive mode, illuminated warning lights on the dashboard, and the vehicle being stuck in neutral range.

2. What can cause the OBDII code P279C to trigger in a 2015 Chevrolet Silverado?

- The code P279C is typically triggered by issues with the four-wheel drive system, such as a faulty neutral range sensor, damaged wiring, or a malfunctioning transfer case control module.

3. How can I diagnose the cause of OBDII code P279C in my 2015 Chevrolet Silverado?

- Diagnosing the code P279C may involve conducting a visual inspection of the wiring and connectors, testing the neutral range sensor for proper functionality, and using a diagnostic scanner to retrieve specific fault codes.

4. Is it safe to continue driving my 2015 Chevrolet Silverado with OBDII code P279C active?

- It is not recommended to continue driving the vehicle with the code P279C active, as it may lead to further damage to the four-wheel drive system and compromise the vehicle's drivability.

5. Can I reset OBDII code P279C in my 2015 Chevrolet Silverado myself?

- While you can clear the code temporarily using an OBDII scanner, it is crucial to diagnose and address the underlying issue causing the code to prevent it from recurring.

6. How much does it cost to repair OBDII code P279C in a 2015 Chevrolet Silverado?

- The cost of repairing the OBDII code P279C can vary depending on the root cause of the issue, but it may involve replacing the neutral range sensor, repairing damaged wiring, or reprogramming the transfer case control module.

7. Are there any DIY repair tips for addressing OBDII code P279C in a 2015 Chevrolet Silverado?

- DIY repair tips may include checking and cleaning the connectors and wiring related to the four-wheel drive system, ensuring proper fluid levels in the transfer case, and following the manufacturer's diagnostic procedures.

8. How long does it typically take to repair OBDII code P279C in a 2015 Chevrolet Silverado?

- The repair time for OBDII code P279C can vary depending on the extent of the issue and the availability of parts, but it may take a few hours to a full day to diagnose and address the problem correctly.

9. Can extreme weather conditions affect the triggering of OBDII code P279C in a 2015 Chevrolet Silverado?

- Extreme weather conditions, such as extreme cold or heat, can potentially impact the performance of the four-wheel drive system and lead to the triggering of code P279C if components are exposed to harsh environments.

10. Will fixing OBDII code P279C in my 2015 Chevrolet Silverado improve fuel efficiency or performance?

- Resolving OBDII code P279C is essential for maintaining the proper functionality of the four-wheel drive system, but it may not directly impact fuel efficiency or overall vehicle performance unless other issues are present.