P279A 2016 Chevrolet Silverado 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 2016 Chevrolet Silverado 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.
Code P279A 2016 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 P279A 2016 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 P279A 2016 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 P279A 2016 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 P279A 2016 Chevrolet Silverado Code
What does the OBDII code P279A mean on a 2016 Chevrolet Silverado?
The P279A code indicates a "Four-Wheel Drive High Range Performance" issue, meaning the vehicle's powertrain control module (PCM) has detected a problem with the four-wheel drive high-range system performance.
What are the common symptoms of the P279A code on a 2016 Silverado?
Symptoms may include the four-wheel drive not engaging properly, reduced vehicle performance, warning lights on the dashboard, and potential drivability issues.
What causes the P279A code to appear on a 2016 Chevrolet Silverado?
Common causes include a faulty transfer case motor, damaged wiring or connectors in the four-wheel drive system, a malfunctioning transfer case control module, or mechanical issues in the transfer case.
Can I still drive my 2016 Silverado with the P279A code active?
While the truck may still be drivable, it could experience reduced performance or fail to engage four-wheel drive. Prolonged driving without addressing the issue can lead to further damage.
How do I diagnose the P279A code on my 2016 Chevrolet Silverado?
Start by scanning the vehicle with an OBDII scanner, inspecting the transfer case motor and related wiring, and checking for mechanical issues in the transfer case. A professional technician may be needed for deeper diagnostics.
What is the most common fix for the P279A code on a 2016 Silverado?
The most common fix is repairing or replacing the transfer case motor, but repairs can also involve fixing damaged wiring or replacing the transfer case control module if necessary.
How much does it cost to fix the P279A code on a 2016 Chevrolet Silverado?
The cost depends on the root cause. Replacing a transfer case motor typically costs $500-$1,000, while wiring repairs or module replacements may vary.
Can a software update fix the P279A code on a 2016 Silverado?
In some cases, a software update to the transfer case control module may resolve the issue, but this depends on the specific circumstances and should be determined by a technician.
What tools are needed to diagnose the P279A code on a 2016 Silverado?
You'll need an OBDII scanner to read and clear codes, a multimeter to check electrical components, and potentially specialty tools for inspecting the transfer case system.
Is the P279A code specific to four-wheel drive vehicles?
Yes, this code is specific to vehicles equipped with a four-wheel drive system and typically relates to the high-range functionality of the transfer case.
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