P2773Four Wheel Drive (4WD) Low Switch Circuit Low
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- P2773 is stored when the signal line of the low-range switch stays below its permitted voltage band, typically because it is pulled to ground. No manufacturer documents P2773 publicly. Toyota shows that the fault type exists in practice but files it differently: on 2024–2025 Tacoma the short to ground appears as P2771 with failure byte 11, and bulletin T-SB-0093-25 traces it to a shift actuator damaged through the transfer case breather. Typical triggers for a low signal are chafed insulation touching the body, water in the actuator or connector, or a switch shorted internally. Unlike P2772 this is a purely electrical finding, and unlike P2774 the reading is too low rather than too high. The vehicle may ignore low range or default the 4WD system.
- What you may notice
- 4WD indicator flashing and warning light on
- Low range cannot be selected or is reported permanently
- Likely causes
- LikelySignal wire chafed through and shorted to ground
- PossibleMoisture in shift actuator or connector (Toyota Tacoma breather issue)
- PossibleLow-range switch shorted internally
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Often possible to do yourself.Typical cost: €50 – €1,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.