P279C Chevrolet 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 Chevrolet 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 Chevrolet 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 Chevrolet?
- 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 Chevrolet?
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 Chevrolet 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 Chevrolet code?
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Information for Specific Chevrolet Models
- P279C 2014 Chevrolet Silverado — Four Wheel Drive Neutral Range Performance
- P279C 2015 Chevrolet Silverado — Four Wheel Drive Neutral Range Performance
- P279C 2016 Chevrolet Silverado — Four Wheel Drive Neutral Range Performance
- P279C 2017 Chevrolet Silverado — Four Wheel Drive Neutral Range Performance
- P279C 2018 Chevrolet Silverado — Four Wheel Drive Neutral Range Performance
Frequently Asked Questions about P279C Chevrolet Code
1. What does the OBDII code P279C mean on a Chevrolet?
The code P279C indicates an issue with the Four-Wheel Drive (4WD) Neutral Range Performance, often related to the transfer case or its control systems.
2. What are the common symptoms of a P279C code on a Chevrolet?
Symptoms may include the 4WD system not engaging properly, the vehicle stuck in neutral, warning lights on the dashboard, or unusual noises from the transfer case.
3. What causes the P279C code to appear on a Chevrolet?
Common causes include a faulty transfer case motor, damaged wiring or connectors, a malfunctioning transfer case control module, or mechanical issues within the transfer case itself.
4. Can you drive a Chevrolet with a P279C code?
Driving with a P279C code is not recommended as it may lead to further damage to the 4WD system or leave your vehicle unable to shift properly between ranges.
5. How can I diagnose the P279C code on my Chevrolet?
Start by using an OBDII scanner to confirm the code, then inspect the transfer case motor, wiring, connectors, and control module for damage or faults.
6. How do you fix the P279C code on a Chevrolet?
Repairs may include replacing the transfer case motor, repairing damaged wiring or connectors, reprogramming or replacing the transfer case control module, or addressing mechanical issues in the transfer case.
7. Can a software issue trigger the P279C code on a Chevrolet?
Yes, outdated or corrupted software in the transfer case control module can trigger the P279C code and may require reprogramming or updating.
8. How much does it cost to repair the P279C code on a Chevrolet?
The cost varies depending on the issue, ranging from $150 for a simple wiring repair to over $1,000 for transfer case motor or control module replacement.
9. What tools are needed to troubleshoot the P279C code on a Chevrolet?
You will need an OBDII scanner, a multimeter to test wiring, and possibly specialty tools to access and test the transfer case motor or control module.
10. Can ignoring the P279C code cause long-term damage to my Chevrolet?
Yes, ignoring the code can lead to further damage to the 4WD system, increased repair costs, and potential safety issues if the vehicle cannot shift properly.
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