Powertrain, generic (extended)

P2773 Four Wheel Drive (4WD) Low Switch Circuit Low

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

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.

Likely causes

Signal wire chafed through and shorted to ground
Moisture in shift actuator or connector (Toyota Tacoma breather issue)
Low-range switch shorted internally

Symptoms

  • 4WD indicator flashing and warning light on
  • Low range cannot be selected or is reported permanently

Repair estimate

DifficultyMediumDIY possible
Parts and labour€50–1,500
Time0.5–6.5 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

four wd low switchwiring harness

Related codes

P2771P2772P2774P0838

References: law.cornell.edu, static.nhtsa.gov, gsi.ext.gm.com.