What does the DEF warning light on JMC mean?
3 Answers
JMC's DEF warning light refers to the indicator light for the vehicle's auxiliary water tank. When this light is on, it indicates that the auxiliary water tank is low on water. To resolve the issue, you need to add water to the auxiliary tank immediately. The reasons for the warning light being on include: engine overheating alarm, damaged water temperature sensor, or insufficient antifreeze. Additional information: 1. The auxiliary water tank is located under the driver's seat. Remove the seat cushion and then the square metal plate to see the rectangular plastic box inside. If the vehicle has power steering, there is also a round plastic bucket nearby containing hydraulic oil. 2. If the auxiliary water tank is low on water, it needs to be refilled immediately. If the issue is related to the internal instrument processor, you should take the vehicle to a local 4S store for servicing. The car dashboard is a device that reflects the working conditions of various vehicle systems. 3. The main function of the car's auxiliary water tank is to allow the antifreeze to expand when the engine temperature is high, with some antifreeze flowing into the auxiliary tank through the radiator cap. When the temperature drops and the cooling system pressure becomes negative, the system draws the antifreeze from the auxiliary tank back into the cooling system through the radiator cap.
Last time I drove my Jiangling pickup truck, the dashboard suddenly flashed a DEF light, which left me puzzled at first. Later, I asked a mechanic friend and learned that this is a warning light specific to diesel vehicles, indicating a low level of Diesel Exhaust Fluid (DEF). DEF is a specialized fluid used to clean exhaust emissions, and if not refilled in time, it can trigger the vehicle's protection mechanism and even limit engine power. The solution is simple: find a gas station or auto parts store to buy a bottle of DEF fluid, then open the small tank cap near the trunk and pour it in. For beginners like me, I suggest not panicking when encountering warnings and dealing with them promptly to avoid breaking down on the road. Going through this process also made me pay more attention to vehicle maintenance—now I always check the fluid levels before heading out to prevent similar situations.
As a seasoned diesel vehicle driver, I'm very familiar with the DEF light. DEF is a standard system in Jiangling diesel vehicles, designed to reduce nitrogen oxide emissions. The light usually comes on when the fluid level is low, typically below 20%. Refilling DEF is simple—just locate the blue filler cap near the fuel tank and top it up. However, don't ignore it; prolonged neglect can lead to SCR catalyst clogging, increased fuel consumption, and even costly repairs. I recommend regularly checking the fluid level and using reputable DEF brands. Though small, this system is crucial for both environmental protection and performance. I often advise drivers to use apps to monitor vehicle data and avoid unexpected failures.
