P279A 2017 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 2017 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 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 P279A 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 P279A 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 P279A 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.
Need more information about the P279A 2017 Chevrolet Silverado code?
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Frequently Asked Questions about P279A 2017 Chevrolet Silverado Code
1. What are the common symptoms of OBDII code P279A in a 2017 Chevrolet Silverado?
- Common symptoms may include difficulty engaging or disengaging the four-wheel drive high range, reduced performance in four-wheel drive mode, and an illuminated warning light on the dashboard.
2. What are some possible causes of OBDII code P279A in a 2017 Chevrolet Silverado?
- Possible causes could include a malfunctioning transfer case control module, wiring issues, a faulty actuator motor, or a problem with the transfer case itself.
3. How can I diagnose the OBDII code P279A in my 2017 Chevrolet Silverado?
- Diagnosing this code typically involves using an OBDII scanner to retrieve the code, checking for any other related codes, inspecting the transfer case components, and testing the transfer case control module.
4. Can I continue driving my 2017 Chevrolet Silverado with OBDII code P279A?
- It is not recommended to continue driving with this code as it may lead to further damage to the transfer case components and affect the performance of the four-wheel drive system.
5. How can I repair OBDII code P279A in my 2017 Chevrolet Silverado?
- Repairing this code may involve replacing the transfer case control module, repairing any damaged wiring, replacing the actuator motor, or servicing the transfer case as needed.
6. Is it possible to reset OBDII code P279A in a 2017 Chevrolet Silverado without repairs?
- While clearing the code may temporarily turn off the warning light, it is crucial to address the underlying issue causing the code to prevent further damage and ensure proper functioning of the four-wheel drive system.
7. Are there any DIY tips for troubleshooting OBDII code P279A in a 2017 Chevrolet Silverado?
- DIY tips may include checking the transfer case fluid level, inspecting for any visible damage to wiring or components, and ensuring proper connections to the transfer case control module.
8. How long does it typically take to repair OBDII code P279A in a 2017 Chevrolet Silverado?
- The repair time can vary depending on the exact cause of the code and the extent of the repairs needed. It is advisable to consult a professional mechanic for an accurate estimate.
9. Can extreme weather conditions contribute to triggering OBDII code P279A in a 2017 Chevrolet Silverado?
- Yes, extreme weather conditions such as extreme cold or heat can sometimes affect the performance of the transfer case components and potentially trigger this code.
10. Is it recommended to seek professional help for diagnosing and repairing OBDII code P279A in a 2017 Chevrolet Silverado?
- Yes, due to the complexity of the four-wheel drive system and the specific components involved, it is advisable to consult a qualified mechanic or dealership for accurate diagnosis and repair of this code.
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