Browse

Property For Sale Property For Rent

Used Cars Others

Antiques Collectibles Apparel Baby Kids Items Books， Movies And Music Electronics Free Stuff Garden Outdoor Health Beauty Home Goods Home Improvement Supplies Musical Instruments Office Supplies Others Pet Supplies Sporting Goods Ticket Toys Games Transportation

Business Crafts Design And Web Events Home Improvement Legal Lessons Personal Pets Photography Repair And Technical Support Wellness Writing， Translation， And Transcription Others

Activities & Groups Artists & Musicians Classes & Lessons Events Friendship & Networking Lost & Found Rideshare Sports Teams Volunteers Travel & Travel Partners Skills & Language Swap Other

What are the reasons for excessive pressure in the urea solution pump?

2 Answers

DeCole

09/07/25 6:37am

There are many reasons for excessive pressure in the urea solution pump. Severe external leakage at the upper part of the urea tank: After replacing the urea tank assembly, if the urea pump still exhibits faults, it is necessary to inspect the urea pump pipelines. Upon checking the urea tank water heating valve, it was found that the water valve was damaged and constantly open. Damage to the water heating valve: A damaged water heating valve can cause the coolant to continuously circulate and heat the urea tank, leading to excessively high temperatures inside the urea tank. This results in urea evaporation, which crystallizes around the urea tank after being discharged through the vent hole. Over time, excessive crystallization at the vent hole can block it. When the urea system operates, severe vacuum is created inside the tank, obstructing urea pressure buildup, thus triggering a fault indicating excessively low urea pressure.

Was this review help?

9

5

Share

DiJosephine

09/19/25 5:48am

I've been driving a diesel truck for several years and have encountered high urea pump pressure multiple times. Common causes include: urea crystallization or foreign objects blocking the pipes, similar to how water pressure rises when a pipe is clogged; malfunction of the pump's motor or control valve, such as internal components getting stuck, leading to abnormal pump speed; poor quality urea solution with excessive impurities or improper concentration, increasing resistance during injection; faulty sensor signals, like a broken pressure sensor sending incorrect readings to the control module; and maintenance issues, such as a clogged filter due to prolonged use, increasing resistance. It's advisable to first check if the urea solution tank is clean, use high-quality DEF (Diesel Exhaust Fluid), and replace the filter regularly. Persistent high pressure can damage the SCR system, affect emissions, and may result in fines. It's best to use a diagnostic tool to read error codes and seek professional help if necessary.

Was this review help?

3

2

Share

Expand All

More Forum Discussions

How to Reset the Grand Cherokee On-Board Computer?

The steps to reset the Grand Cherokee on-board computer are as follows: 1. Disconnect the positive terminal of the battery. Note: Ensure the engine is turned off and all electrical devices are switched off before disconnecting the battery. 2. Reconnect the battery. 3. Power on the vehicle and wait for the computer to self-check for 30 seconds. 4. Power off the vehicle and wait for another 30 seconds. 5. Start the engine. More details are as follows: 1. The vehicle's computer, also known as the on-board computer (ECU), or electronic control unit, processes simple electronic signals and performs basic calculations using simple logic gates and integrated circuit principles. 2. It receives data from various sensors throughout the vehicle, processes and computes this information, and then sends signals to the engine to control its operation (such as the fuel injection system and ignition timing).

Why does the car jerk when hot but not when cold?

Cold car does not jerk but hot car jerks because the solenoid valve is damaged and needs to be repaired at a professional repair shop in time. The following is a related introduction about the solenoid valve: Introduction: The solenoid valve (Electromagnetic-valve) is an industrial equipment controlled by electromagnetics, which is an automated basic component used to control fluids and belongs to the actuator, not limited to hydraulics and pneumatics. It is used in industrial control systems to adjust the direction, flow, speed and other parameters of the medium. The solenoid valve can cooperate with different circuits to achieve the expected control, and the control accuracy and flexibility can be guaranteed. There are many types of solenoid valves, and different solenoid valves play a role in different positions of the control system. The most commonly used are check valves, safety valves, directional control valves, speed regulating valves, etc. Working principle: There is a sealed cavity in the solenoid valve, with through holes opened in different positions. Each hole is connected to a different oil pipe. The middle of the cavity is a piston, and both sides are two electromagnets. The valve body will be attracted to the side where the magnetic coil is energized. By controlling the movement of the valve body, different oil discharge holes are opened or closed, while the oil inlet hole is always open. The hydraulic oil will enter different oil discharge pipes, and then the pressure of the oil pushes the piston of the oil cylinder. The piston drives the piston rod, and the piston rod drives the mechanical device. In this way, the mechanical movement is controlled by controlling the current on and off of the electromagnet.

How Often Should a Passenger Car Undergo Inspection?

For new vehicles within 6 years, an inspection is required every two years. Vehicles older than 6 years must be inspected annually, while those exceeding 15 years require inspection every 6 months. The inspection standards for other vehicle types are as follows: 1. Operational passenger vehicles must be inspected annually within the first 5 years and every 6 months thereafter. 2. Trucks, as well as large and medium-sized non-operational passenger vehicles, require annual inspection within the first 10 years and every 6 months thereafter. 3. Small and mini non-operational passenger vehicles must be inspected every 2 years within the first 6 years, annually thereafter, and every 6 months after 15 years. 4. Motorcycles must be inspected every 2 years within the first 4 years and annually thereafter. 5. Tractors and other motor vehicles require annual inspection.

What Causes the Abnormal Noise in Car Windows?

There could be several reasons for abnormal noise in car windows: 1. The noise during window glass movement may be due to dust accumulation in the rubber guide channels, increasing resistance and causing squeaking sounds. The solution is to clean the glass guide channels. 2. Aging rubber in the window glass guide channels can lead to slight jamming and noise during window movement, which can be resolved by applying lubricant. 3. If the window glass not only makes noise but also moves with difficulty, tilts to one side, or fails to respond during operation, it might be due to lost initialization data of the window. Performing a reinitialization of the window can solve this issue.

How to Check What Year a Car Model Is?

Here are the methods to check what year a car model is: 1. The most direct method is to refer to the instruction manual provided at the time of purchase, which contains detailed information. You can also make a phone inquiry; there is always a dedicated customer service representative assigned when you buy a car, whom you can consult directly if you have any questions, including those about the car. 2. Another method is to check the car's VIN code. The 10th digit of the VIN code indicates the year, though this year may slightly differ from the manufacturing year, usually by no more than a year, and is generally close to the model year, often considered the default. Additionally, you can take a picture of the car and use Baidu's image recognition feature to identify it. Once identified, detailed information, including the year, will be available.

Why is the steering wheel not straight after changing tires?

Here are the specific reasons why the steering wheel is not straight after changing tires: 1. Inconsistent tire pressure: If the tire pressure on the left and right sides is uneven, it can cause the steering wheel to pull to one side while driving. 2. Abnormal wear: Issues like uneven tire wear can lead to steering wheel misalignment, and may even cause slight steering wheel vibration at high speeds. In such cases, a wheel alignment adjustment is necessary. 3. Suspension system failure: Manufacturers conduct strict inspections and adjustments on vehicles before leaving the factory. For example, interference between the suspension guide rods and the steering linkage can affect vehicle alignment.

Trending Ranking

What is the Difference Between 91V and 91H?

Which National Emission Standard Vehicles Are Not Allowed on the Road?

How many times can a temporary license plate be applied for a newly purchased car?

Is it mandatory to purchase insurance from the dealership when buying a car at a 4S store?

What is a Non-Disassembly Solution for Transmission Faults?

Does the Honda Lingpai have a 4-cylinder engine?

What's the Difference Between Gear Oil and Engine Oil?

1.5T or 2.0L: Which Consumes More Fuel?

How many points are deducted for not driving according to the guide?

How Long Does It Take to Perform a Four-Wheel Alignment?

More Forum Discussions

How many points are deducted for failing to reverse into the garage?

What does it mean for a vehicle to undergo annual inspection?

High-Speed Vehicle Body Vibration?

Should the Clutch Be Fully Released When Shifting from First to Second Gear?

Help

Cookie

Cookie Settings

© 2025 Servanan International Pte. Ltd.