What does it mean when the DEF light is on in a truck?
1 Answers
Truck DEF light being on indicates that the vehicle's auxiliary water tank is low on water and should be refilled promptly. Here are the relevant explanations: 1. Explanation one: If the DEF is displayed on the small odometer of the dashboard, it indicates an internal processor fault in the dashboard. You should immediately go to a professional repair shop in your area for service. 2. Explanation two: Methods for checking internal dashboard faults include the tapping and pressing method, which can determine if the fault is caused by poor contact or soldering issues, and the comparison method, which involves using two identical dashboards to compare their voltage, waveform, static impedance, output results, current, etc.