P279B Chevrolet Code - Four Wheel Drive Low 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
- P279B Chevrolet indicates Four Wheel Drive Low 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 P279B 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 P279B 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 P279B 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 P279B 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.
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Information for Specific Chevrolet Models
- P279B 2014 Chevrolet Silverado — Four Wheel Drive Low Range Performance
- P279B 2015 Chevrolet Silverado — Four Wheel Drive Low Range Performance
- P279B 2016 Chevrolet Silverado — Four Wheel Drive Low Range Performance
- P279B 2017 Chevrolet Silverado — Four Wheel Drive Low Range Performance
- P279B 2018 Chevrolet Silverado — Four Wheel Drive Low Range Performance
Frequently Asked Questions about P279B Chevrolet Code
1. What are the common symptoms of OBDII code P279B (Chevrolet) related to Four Wheel Drive Low Range Performance?
- Common symptoms include difficulty engaging or disengaging four-wheel drive low range, unusual noises from the transfer case, and a flashing indicator light on the dashboard.
2. What are the possible causes of OBDII code P279B (Chevrolet) indicating Four Wheel Drive Low Range Performance issues?
- Potential causes include a faulty transfer case motor, damaged wiring or connectors in the transfer case system, low transfer case fluid levels, or a malfunctioning transfer case control module.
3. How can I diagnose OBDII code P279B (Chevrolet) for Four Wheel Drive Low Range Performance problems?
- Diagnose the code by checking for any visible damage to wiring and connectors, inspecting transfer case fluid levels, testing the transfer case motor for proper operation, and using a scan tool to retrieve specific diagnostic trouble codes.
4. What are some repair tips for addressing OBDII code P279B (Chevrolet) related to Four Wheel Drive Low Range Performance?
- Repair tips may include replacing a faulty transfer case motor, repairing damaged wiring or connectors, refilling transfer case fluid to the correct level, or reprogramming the transfer case control module if necessary.
5. Can I continue driving my vehicle with OBDII code P279B (Chevrolet) without addressing Four Wheel Drive Low Range Performance issues?
- It is not recommended to continue driving the vehicle with this code present, as it may lead to further damage to the transfer case system and potentially compromise the vehicle's four-wheel drive functionality.
6. How much does it typically cost to repair OBDII code P279B (Chevrolet) problems associated with Four Wheel Drive Low Range Performance?
- The cost of repairs can vary depending on the specific issue causing the code, but it may range from a few hundred dollars for minor repairs to over a thousand dollars for more complex repairs involving the transfer case components.
7. Are there any preventive maintenance measures to help prevent OBDII code P279B (Chevrolet) issues related to Four Wheel Drive Low Range Performance?
- Regularly checking and maintaining transfer case fluid levels, inspecting wiring and connectors for damage, and addressing any unusual noises or symptoms promptly can help prevent issues leading to this code.
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