What is the cause of fault code P30C0 fuel defect?
2 Answers
Fault code P30C0 fuel defect is caused by poor fuel quality. Gasoline quality: The ideal fuel color should be transparent or semi-transparent light yellow. If the color is too dark, it indicates the fuel contains excessive impurities like sulfur. Strong gasoline odor is undesirable - if opening the fuel cap releases an intense gasoline smell or even irritating fumes, it suggests inferior fuel with excessive sulfur content. Identification methods: Vehicles consistently using authentic national standard gasoline may develop abnormal noises after refueling with blended gasoline. Exhaust emissions may change after using blended gasoline, appearing whiter, blacker, or with unusual odor. Normal fuel appears clear and transparent with light or colorless appearance. Cloudy, whitish, or dark-colored fuels may indicate quality issues.
Recently, while driving my diesel car, the dashboard displayed a P30C0 fault code. At first, I thought it was a minor issue and ignored it, but then the car started shaking badly during acceleration. After checking, I found out it was a fuel quality problem—I had used cheap fuel that was likely contaminated with water or impurities, causing the fuel injectors to clog. In this situation, the fuel couldn’t burn properly, and the car threw this code. I also inspected the fuel filter, and sure enough, it was dirty and needed replacement. Don’t skimp on maintenance; choosing high-quality diesel can save you a lot of trouble. Additionally, sensor misjudgments can trigger similar issues, but the most common cause is poor fuel quality. If you encounter this problem, don’t push through—get it checked by a professional shop ASAP. Safety first.
