* Faulty sensor: A sensor related to the 4WD system (even if the system itself is absent) might be malfunctioning and sending a signal that triggers the light.
* Wiring issue: A short circuit or broken wire in the 4WD system's wiring harness could also trigger the light. This is possible even in a 2WD truck because the wiring may still be present, although it won't connect to any active 4WD components.
* Transfer case related issue (If applicable): Even though your truck is 2WD, there may still be a rudimentary transfer case (some models had a simplified one), and a sensor or problem within it could be at fault.
* Other electrical issues: A general electrical fault in your vehicle's system could sometimes cause unexpected warning lights to illuminate.
What to do:
You should have the vehicle scanned for diagnostic trouble codes (DTCs) using an OBD-II scanner. This will pinpoint the exact cause of the light being illuminated. A mechanic can interpret the codes and perform necessary repairs. Ignoring it could potentially lead to more serious issues (though less likely in a pure 2WD vehicle than one with 4WD). The diagnostic will identify the specific problem and prevent unnecessary repairs.
