P2771 2018 Chevrolet Silverado Code - Four Wheel Drive Low Switch Circuit
Quick Answer
For vehicles equipped with an active transfer case, the four-wheel drive (4WD) low circuit consists of the Powertrain Control Module (PCM), a transfer case control module, and the circuit wiring. Common causes include Faulty Transfer Case Shift Control Switch, Transfer Case Shift Control Switch harness is open or shorted, Transfer Case Shift Control Switch circuit poor electrical connection. 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
- P2771 2018 Chevrolet Silverado indicates Four Wheel Drive Low Switch Circuit.
- Common causes
- Common causes include Faulty Transfer Case Shift Control Switch, Transfer Case Shift Control Switch harness is open or shorted, Transfer Case Shift Control Switch circuit poor electrical connection.
- 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 P2771 2018 Chevrolet Silverado Description
For vehicles not equipped with an active transfer case, the 4WD low circuit consists of the PCM, a transfer case switch, and the circuit wiring. The transfer case switch controls the 4WD low signal on the signal circuit. When the operator selects 4WD low, the transfer case switch closes, and the 4WD low signal voltage on the signal circuit changes from ignition voltage to zero volts. The PCM then compensates for transfer case gear reduction in the transmission output shaft speed (OSS) sensor signal. The PCM uses the transmission OSS sensor signal to adjust shift points, line pressure, and TCC scheduling.
What are the Possible Causes of the DTC P2771 2018 Chevrolet Silverado?
- Faulty Transfer Case Shift Control Switch
- Transfer Case Shift Control Switch harness is open or shorted
- Transfer Case Shift Control Switch circuit poor electrical connection
How to Fix the DTC P2771 2018 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 P2771 2018 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 P2771 2018 Chevrolet Silverado Code
1. What are the common symptoms of OBDII code P2771 in a 2018 Chevrolet Silverado?
- Common symptoms include difficulty engaging or disengaging four-wheel drive low mode, illuminated warning lights on the dashboard, and issues with the electronic four-wheel drive system.
2. What does the OBDII code P2771 in a 2018 Chevrolet Silverado indicate?
- This code indicates a problem with the Four Wheel Drive Low Switch Circuit, specifically a circuit malfunction or open/short circuit.
3. What are the possible causes of OBDII code P2771 in a 2018 Chevrolet Silverado?
- Possible causes include a faulty four-wheel drive low switch, damaged wiring or connectors in the circuit, issues with the transfer case control module, or a malfunctioning PCM.
4. How can I diagnose the cause of OBDII code P2771 in my 2018 Chevrolet Silverado?
- To diagnose this issue, you may need to perform a thorough inspection of the four-wheel drive low switch, check for damaged wiring or connectors, and use a diagnostic scan tool to retrieve stored fault codes.
5. Can I continue driving my 2018 Chevrolet Silverado with OBDII code P2771?
- It is not recommended to continue driving with this code present, as it may lead to further damage to the four-wheel drive system. It's best to address the issue promptly.
6. How can I repair OBDII code P2771 in my 2018 Chevrolet Silverado?
- Repair steps may include replacing the faulty four-wheel drive low switch, repairing damaged wiring or connectors, or addressing any issues with the transfer case control module or PCM.
7. Will resetting the OBDII code P2771 in my 2018 Chevrolet Silverado solve the problem?
- Simply resetting the code may temporarily clear the warning lights, but it will not fix the underlying issue causing the code. Proper diagnosis and repair are necessary.
8. Are there any DIY tips for resolving OBDII code P2771 in a 2018 Chevrolet Silverado?
- DIY enthusiasts with the necessary tools and experience can attempt to inspect and replace the four-wheel drive low switch or repair damaged wiring. However, complex issues may require professional help.
9. How long does it typically take to repair OBDII code P2771 in a 2018 Chevrolet Silverado?
- The repair time can vary depending on the exact cause of the code. Simple fixes like replacing a switch may take a short time, while diagnosing and repairing wiring issues could be more time-consuming.
10. Can a mechanic help me fix OBDII code P2771 in my 2018 Chevrolet Silverado?
- Yes, a qualified mechanic with experience in diagnosing and repairing electronic four-wheel drive systems can help identify the root cause of the code and perform the necessary repairs to resolve the issue.
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