AutoCodes – Chevrolet – P279A Chevrolet

P279A Chevrolet Code - Four Wheel Drive High 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: P279A Chevrolet indicates Four Wheel Drive High 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 5,252

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 P279A Chevrolet 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 P279A Chevrolet - Four Wheel Drive High Range Performance - AutoCodes.com — P279A Chevrolet Code - Four Wheel Drive High Range Performance

What does this mean?

What are the Possible Causes of the DTC P279A 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 P279A 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 P279A 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 P279A Chevrolet code?

Need more information on how to fix the P279A Chevrolet code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P279A Chevrolet code diagnosed by a professional: Find a repair shop in your area

Information for Specific Chevrolet Models

P279A 2014 Chevrolet Silverado — Four Wheel Drive High Range Performance
P279A 2015 Chevrolet Silverado — Four Wheel Drive High Range Performance
P279A 2016 Chevrolet Silverado — Four Wheel Drive High Range Performance
P279A 2017 Chevrolet Silverado — Four Wheel Drive High Range Performance
P279A 2018 Chevrolet Silverado — Four Wheel Drive High Range Performance

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 P279A Chevrolet Code

1. What are the common symptoms of OBDII code P279A in a Chevrolet related to Four Wheel Drive High Range Performance?

- Common symptoms include difficulty engaging or disengaging four-wheel drive high range, erratic shifting between high and low range, and dashboard warning lights.

2. What are the possible causes of OBDII code P279A in a Chevrolet related to Four Wheel Drive High Range Performance?

- Potential causes include faulty transfer case shift motor, damaged wiring or connectors, low transfer case fluid levels, or a malfunctioning transfer case control module.

3. How can I diagnose the OBDII code P279A in a Chevrolet related to Four Wheel Drive High Range Performance?

- Diagnose the issue by checking for any visible damage to wiring and connectors, verifying transfer case fluid levels, and using a diagnostic scanner to read trouble codes and monitor transfer case operation.

4. What are some recommended repair tips for resolving OBDII code P279A in a Chevrolet related to Four Wheel Drive High Range Performance?

- Repair tips may include replacing the transfer case shift motor, repairing damaged wiring or connectors, topping up transfer case fluid, or reprogramming the transfer case control module.

5. Can I drive my Chevrolet with OBDII code P279A related to Four Wheel Drive High Range Performance?

- It is not recommended to drive your vehicle with this code as it may lead to further damage to the transfer case components or affect the drivability and safety of your vehicle.

6. How much does it typically cost to repair OBDII code P279A in a Chevrolet related to Four Wheel Drive High Range Performance?

- The cost of repair can vary depending on the specific issue, but it may range from a few hundred dollars for minor repairs to over a thousand dollars for more complex repairs involving component replacement.

7. Is it possible to reset or clear OBDII code P279A in a Chevrolet related to Four Wheel Drive High Range Performance without fixing the underlying issue?

- While you can clear the trouble code using a diagnostic scanner, it is not recommended as the issue will likely resurface, and driving with an unresolved problem may lead to more severe damage.

8. How long does it take to repair OBDII code P279A in a Chevrolet related to Four Wheel Drive High Range Performance?

- The repair time can vary depending on the exact cause of the issue and the complexity of the repair needed, but it typically takes a few hours to a full day to diagnose and fix the problem.

9. Are there any preventative maintenance steps to avoid OBDII code P279A in a Chevrolet related to Four Wheel Drive High Range Performance?

- Regularly inspecting and maintaining transfer case components, checking transfer case fluid levels, and addressing any abnormal noises or shifting issues promptly can help prevent the occurrence of this trouble code.

10. Can a DIY enthusiast with basic automotive knowledge fix OBDII code P279A in a Chevrolet related to Four Wheel Drive High Range Performance?

- Depending on the exact cause, some DIY enthusiasts may be able to address simpler issues like checking and topping up fluid levels or replacing damaged connectors. However, more complex repairs involving component replacement or electrical diagnostics are best left to professionals.