What does the fault code P0404 mean for Wuling/Baojun vehicles?
3 Answers
Wuling/Baojun P0404 fault code indicates no signal from the EGR valve. This error may cause a decrease in torque. When it appears, you can check the wiring harness of the EGR valve or whether the entire valve is burnt out. Below is the relevant content: Function of the EGR valve: The EGR valve is a mechatronic product installed on diesel engines to control the amount of exhaust gas recirculated back to the intake system. Its function is to regulate the amount of exhaust gas entering the intake manifold for recirculation. P0404 fault handling method: When the P0404 fault code appears, first follow the EGR monitoring screen to compare the indicated opening with the actual following value for errors. If it meets the standard (within 5%), it is a normal phenomenon, and the P0404 fault code indicates an abnormal condition. If it does not meet the standard, it indicates a problem with the EGR valve. At this point, you can inspect and repair or directly replace the entire EGR valve. After completing the above steps and confirming the fault is resolved, you can clear the P0404 fault code.
When it comes to the fault code P0404 in Wuling or Baojun vehicles, as an experienced driver, I believe it usually indicates an issue with the EGR valve in the exhaust gas recirculation system. P0404 means the valve's opening and closing range isn't following the computer's commands, possibly due to the valve being stuck in the open or closed position, a faulty position sensor, or carbon buildup caused by poor electrical contact. Normally, the EGR system is responsible for recirculating some exhaust gases to reduce emissions and temperature, but when it malfunctions, the engine may feel shaky and unstable, fuel consumption may increase, and even black smoke may appear from the exhaust. For repairs, you can start by simply cleaning the carbon buildup around the valve. If that doesn’t work, replace the component and check the circuit. I recommend seeking professional repair as soon as possible to avoid further damage and greater losses. For daily maintenance, using high-quality fuel and avoiding short-distance, low-speed driving can reduce carbon buildup, prevent similar issues, and even save fuel while being eco-friendly.
As a DIY enthusiast and cost-conscious car owner, my Wuling once displayed a P0404 trouble code, indicating an inflexible EGR valve operation. Possible causes include excessive carbon buildup jamming the valve, loose connectors, or a blown fuse. When handling it myself, I would first disconnect the battery to clear the fault code and check if it reappears. Then, I'd disassemble and inspect the EGR area, using carburetor cleaner spray for cleaning. If the warning light turns off after cleaning, the issue is resolved; otherwise, consider replacing the part. However, be cautious not to damage the wiring—after all, saving on repair costs also means gaining experience. Remember to prepare gloves, tools, and online tutorial videos in advance to avoid fumbling and causing damage. This ensures safer driving and saves money.
