What are the common issues with the National V J6P420?

[DeAlexis]

The common issue with the National V J6L240 is frequent malfunctions in the SCR technology route. Below are the daily maintenance methods for the SCR system: 1. Regular inspection: Periodically check whether the nozzle valve needle closes tightly, inspect the urea pump's air pressure pipelines for faults, and check if the nozzle is cracked or damaged. These issues can lead to poor spray atomization, causing crystallization blockages. Since residual liquid remains in the urea pump and pipelines after the vehicle stops working, prolonged inactivity may result in crystallization or freezing. It is necessary to perform residual liquid drainage after the vehicle is turned off. 2. Regular cleaning: All urea pumps have filters or filter elements that must be cleaned or replaced regularly. Otherwise, prolonged use may cause blockages or damage, rendering the filtration ineffective.

[TaylorLynn]

I've been driving my China V standard FAW J6P420 for a while now, and to be honest, some common issues are quite annoying. For example, the DPF system keeps getting clogged, often causing sudden power loss on highways, requiring frequent manual regeneration. If not addressed, fuel consumption spikes, adding significant fuel costs per trip. The clutch also tends to squeak and can burn out with prolonged use, requiring regular checks. The dashboard warning lights, like the emission system alert, often flicker and sometimes only go away after a restart. You have to constantly monitor the water temperature as overheating can lead to bigger problems. I think proper daily maintenance, like timely ash cleaning and filter replacement, can reduce some trouble, but overall, it still affects the driving experience. I'd recommend spending more on professional repairs.

[LeoAnn]

As someone who frequently repairs these types of trucks, the most troublesome aspect of the National V J6P420 is the aftertreatment system. The SCR catalyst often malfunctions, and when the urea pump gets stuck, emissions exceed standards. If the warning light stays on without any movement, parts need to be replaced. The electronic modules are also delicate—once a sensor fails, error codes pop up, requiring computer diagnostics, which is time-consuming and costly. It's not uncommon for the clutch pedal to fail to spring back, especially after long-distance driving. I recommend that owners regularly check fuses and wiring contact points to prevent short circuits and part damage. Don’t skimp on small expenses—stay diligent with maintenance, such as cleaning DPF carbon buildup, to extend the engine's lifespan and avoid breakdowns that could lead to major disruptions.

[OJeremiah]

From a safety perspective, the common issues with this car are concerning. I'm most worried about the braking system, such as occasional ABS failure, which poses a significant risk of skidding on slippery roads. When the DPF is severely clogged, it leads to power loss, and sudden speed drops during overtaking can easily cause rear-end collisions. Aging headlight wiring also causes intermittent failures, doubling the danger when driving at night. False alarms from dashboard warning lights further disrupt judgment. As a driver, it's essential to inspect key components before every trip, promptly replace parts or adjust repairs without delay to ensure a safe journey. It's advisable for owners to keep some emergency tools in the car to handle unexpected situations.