P2771 2014 GMC Sierra 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 2014 GMC Sierra 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 2014 GMC Sierra 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 2014 GMC Sierra?
- 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 2014 GMC Sierra?
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 2014 GMC Sierra 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 2014 GMC Sierra Code
1. What does the OBDII code P2771 mean on a 2014 GMC Sierra?
- Code P2771 indicates a fault in the Four Wheel Drive Low Switch Circuit, suggesting that there is an issue with the electrical circuit associated with the 4WD low range function.
2. What symptoms might I notice if my 2014 GMC Sierra has the P2771 code?
- Symptoms can include the 4WD system failing to engage or disengage properly, an illuminated check engine light, and possibly other 4WD system warning lights.
3. What are common causes of the P2771 code in a 2014 GMC Sierra?
- Common causes include a faulty 4WD low switch, damaged wiring or connectors in the 4WD switch circuit, or a problem with the 4WD control module.
4. How can I diagnose the P2771 code in my 2014 GMC Sierra?
- Diagnosis should begin with a visual inspection of all relevant wiring and connectors. Use a multimeter to check for continuity and proper voltage in the 4WD low switch circuit. It may also be necessary to scan the vehicle with a diagnostic tool to monitor 4WD switch input signals.
5. What are some possible repairs for the P2771 code on a 2014 GMC Sierra?
- Repairs can include replacing the 4WD low switch, repairing or replacing damaged wiring or connectors, or in some cases, replacing the 4WD control module if it is found to be defective.
6. Is it safe to drive my 2014 GMC Sierra with the P2771 code active?
- While you might still be able to drive your vehicle, it is not recommended to use the 4WD function until the issue is resolved, as it could lead to further damage or loss of control in certain driving conditions.
7. Can the P2771 code affect the overall performance of my vehicle?
- Yes, besides the 4WD system malfunctions, the P2771 code might not directly affect the engine performance, but it can lead to complications with handling and driving safety in off-road or slippery conditions.
8. How urgent is it to fix a P2771 code in a 2014 GMC Sierra?
- It is moderately urgent to address this issue, especially if you rely on the 4WD for regular driving conditions. Delaying repairs can lead to further damage to the 4WD system components.
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