P2771
Four Wheel Drive (4WD) Low Switch Circuit
The 4WD-Low engagement switch circuit is faulty. The transmission and chassis controllers cannot tell whether the transfer case is in low range.
- Check engine light: Yes
- Emissions related: No
- Repair difficulty: easy
Common causes
Ordered by how often each turns out to be the cause.
- Switch contacts worn or corrodedCommon
- Broken wire to switchPossible
Parts involved
- Four Wd Low Switch
- Transfer Case
- Wiring Harness
P2771 is a generic OBD-II code defined by SAE J2012. Exact wording and diagnostic procedure vary by manufacturer and model. Code definitions are drawn from the public-domain OBDex dataset; the workshop notes are our own.