BMW DTC P2771 – Four Wheel Drive (4WD) Low Switch Circuit
DTC P2771 meaning on BMW
DTC P2771 on a BMW refers to a fault with the Four Wheel Drive (4WD) Low Switch Circuit. This diagnostic trouble code indicates that there is an issue with the circuit responsible for controlling the 4WD low range function in the vehicle.
BMW DTC P2771 symptoms
Symptoms of DTC P2771 on a BMW may include:
- 4WD system not engaging or disengaging properly
- 4WD low range not functioning
- Illumination of the 4WD warning light on the dashboard
BMW DTC P2771 causes
Common causes of DTC P2771 on a BMW include:
- Faulty 4WD low switch
- Wiring or connector issues in the 4WD low switch circuit
- Defective transfer case control module
BMW DTC P2771 seriousness
The seriousness of DTC P2771 on a BMW depends on the driving conditions and the driver’s reliance on the 4WD low range function. While the vehicle may still be operable in 2WD mode, the loss of 4WD low range capability can impact off-road performance and traction in certain situations.
How to diagnose DTC P2771 on BMW
To diagnose DTC P2771 on a BMW, a mechanic would typically perform the following steps:
- Use a diagnostic scanner to retrieve the fault code and related data
- Inspect the 4WD low switch and its wiring for any visible damage or corrosion
- Check the transfer case control module for proper operation
- Perform a continuity test on the circuit to identify any open or short circuits
How to fix DTC P2771 on BMW
To fix DTC P2771 on a BMW, the following steps may be taken:
- Replace the faulty 4WD low switch if it is found to be defective
- Repair any damaged wiring or connectors in the 4WD low switch circuit
- If the transfer case control module is faulty, it may need to be replaced
- Clear the fault code and perform a test drive to ensure the issue has been resolved
How to erase DTC P2771 on BMW
To erase DTC P2771 on a BMW, the fault code can be cleared using a diagnostic scanner. After the necessary repairs have been made to address the underlying issue, the code can be reset to turn off the warning light and ensure proper functionality of the 4WD low switch circuit.
Recommended tools & DTC Scanners for BMW
Best Diagnostic App for modern BMWs: BimmerLink
Recommended Bluetooth adapter for Bimmerlink: OBDLink CX
Cable adapter for Bimmerlink: Enet Cable USB Type C
For older BMWs we recommend: Autel AutoLink AL319 (2024 version)
Easy-to-use Multimeter for reliable diagnostics: AstroAI Auto-ranging Multimeter
Some of the links on this page may be affiliate links, which means we may earn a small commission if you make a purchase. This helps us keep our DTC database up to date and provide valuable content for free. We only recommend products that we have tested and believe to be the best in their class.