Four Wheel Drive (4WD) Low Switch Circuit High
Voltage on the 4WD-Low switch line is above the expected window. Usually an open switch or a short to battery.
Affected components
- Four wd low switch
- Wiring harness
Common causes
- High likelihood: Open switch contacts
- Medium likelihood: Switch wire shorted to B+
- Low likelihood: Connector pins corroded - high contact resistance
Diagnostic notes
- The malfunction indicator lamp may illuminate
Sources
Diagnostic information is provided for reference only. Confirm the code with a compatible scan tool and follow the vehicle manufacturer's service procedures before replacing components.