···
Log in / Register

What does it mean when the circle P light is on?

3 Answers
Tyler
07/29/25 3:48pm
p light on indicates the parking brake, in the working state means the handbrake is in the braking position, not released properly. The parking brake refers to the manual brake installed on the vehicle, used to stabilize the car after it has stopped, preventing accidents caused by the car rolling when parked on the road. The common handbrake is usually located at the position where the driver's right hand hangs down. The exclamation mark on the dashboard can be divided into three situations: 1. An exclamation mark inside a circle with brackets: The brake friction pads are damaged, or there is a lack of brake fluid. The solution is to release the parking brake and check if the brake fluid is insufficient. If the light remains on, go to a repair shop to replace the brake friction pads. 2. An exclamation mark inside a triangle: There is a fault with the external lights. The solution is to check if the lights are faulty. If there is no fault and the light remains on, it is recommended to go to a repair shop for maintenance. 3. An exclamation mark inside yellow brackets: There is a problem with the tire pressure of a certain tire. The solution is to observe whether the wheel is punctured or leaking. If not, drive at low speed to find an auto repair shop, beauty shop, or roadside car wash, as these places usually have air pumps to inflate the car. Then observe the dashboard condition again. If the warning light still does not go off, you need to find the settings in the vehicle's central console and perform another tire pressure detection. The light will go off after normal detection.
Was this review help?
16
4
Share
VonMia
08/15/25 3:30am
Last time when I was driving to work, that circular P light suddenly came on, which really startled me as I was in a hurry on the highway. Generally speaking, the most common reason for this indicator light to illuminate is the parking brake – what we commonly call the handbrake not being fully released, or the electronic parking system getting stuck. After checking myself, I found the handbrake was indeed slightly loose, and it went off after I tightened it again. But if the light stays on even when the handbrake is properly released, it might be a sensor issue, such as dust accumulation or wiring problems, or more seriously, it could indicate insufficient brake fluid triggering a brake system warning. I've encountered this twice – once it was simply forgetting to release the brake, and another time the mechanic told me the sensor was dirty and just needed cleaning. If not addressed promptly, the illuminated light means the vehicle isn't fully releasing the brake, which can wear out the brake pads and even affect driving safety, especially when going downhill. My suggestion is not to panic when this happens; find a safe place to pull over and check the handbrake position. If that doesn't solve it, get it repaired as soon as possible to prevent a minor issue from turning into a major accident. Developing a habit of checking the brake before driving can help avoid a lot of trouble.
Was this review help?
3
3
Share
Expand All
VonJune
10/12/25 3:57am
As a new driver who just got my license, I was driving my dad's car the other day when suddenly the circular P light on the dashboard lit up, which made me panic and unsure whether to keep driving. Later, I asked him and learned that this is the parking brake indicator light. Most of the time, it means the handbrake isn't fully released, or the electronically controlled braking system hasn't disengaged. New drivers like me often forget to release the brake properly or don't pull it far enough when nervous. Additionally, older cars might have aging sensors that trigger false alarms or loose wiring connections causing the light to come on unnecessarily. The solution is simple: stop the car, turn off the engine, and try operating the handbrake switch again. If it still doesn't work after a few attempts, it might be a system malfunction requiring professional inspection. The basic knowledge I learned in driving school mentioned that the light indicates incomplete brake release, which can lead to increased fuel consumption, poor acceleration, and potential long-term damage to the car. I recommend new drivers carry a user manual and communicate more with friends to avoid major mistakes due to lack of knowledge. Remember, safety comes first—if the light is on, don't push your luck, as small issues can turn into big problems.
Was this review help?
17
1
Share
Expand All
More Forum Discussions

What Does the Cylinder Block Assembly Include?

The cylinder block assembly of an engine consists of major components such as the cylinder block, crankshaft, crankshaft bearing shells, connecting rod bearing shells, crankshaft thrust washers, connecting rod assembly, piston, piston rings, piston pin, piston pin circlips, and cylinder liners. The engine assembly includes: Fuel supply and regulation system: Its primary function is to provide the required fuel for mixture formation and combustion within the engine cylinders. Crankshaft connecting rod mechanism: Its purpose is to convert the reciprocating motion of the pistons into the rotational motion of the crankshaft, changing the mode of force application, allowing rotational power to be transmitted to the gearbox for proper distribution. Valve train and intake/exhaust systems: Depending on the engine's combustion conditions, the valve train can appropriately adjust the mixture supply to the engine, maximizing combustion efficiency, while the intake/exhaust systems automatically open and close valves for intake or exhaust. Lubrication and cooling systems: The lubrication system also lubricates internal components during engine operation while transferring heat and dissipating some of the engine's heat. Pros and cons of replacing the engine assembly: The advantage of replacing the engine assembly is achieving superior power performance, and it also allows for minor program adjustments based on personal preferences to enhance the overall driving experience. However, the engine is an extremely complex instrument, and installation and matching must be error-free; otherwise, there will inevitably be certain safety hazards, potentially causing 'secondary damage' to the entire vehicle, with the slightest negligence possibly leading to catastrophic consequences.
3
5
Share

Which circulation mode should be turned on for defogging in rainy weather?

Whether to use the internal or external circulation mode for defogging on rainy days depends on the specific situation. In summer, use the air conditioning for defogging with the internal circulation mode to reduce air humidity. In winter, use the warm air for defogging. The driver can first use the external circulation mode to reduce the temperature difference between the inside and outside of the car, wait a few minutes, and then switch to the internal circulation mode. Method for defogging with air conditioning in summer: The driver can first press the A/C switch button, then turn on the front windshield defogging button, set the temperature to the lowest, and adjust the air volume. After a while, the fog on the front windshield will be eliminated. If fog is found on the rear windshield and side mirrors, the rear window heating button can also be turned on while defogging the front windshield to eliminate the fog on the glass. Method for defogging with warm air in winter: If the car has just been started, do not turn on the air conditioning immediately. Wait a few minutes for the engine to warm up. When the water temperature reaches a certain level, turn on the warm air, set the air volume to the maximum, and then turn on the front window defogging button. After a while, the fog on the front windshield will be eliminated. This method is also applicable to fogging on the outside of the glass in summer.
6
4
Share

What is the positive direction of the XYZ axes in the vehicle coordinate system?

To determine the positive directions of the X, Y, and Z axes, place the back of your right hand facing the screen. The thumb points in the positive direction of the X axis. Extend your index and middle fingers, with the index finger pointing in the positive direction of the Y axis. The direction indicated by the middle finger is the positive direction of the Z axis. The introduction to the vehicle coordinate system is as follows: Measurement method of the vehicle coordinate system: Its origin coincides with the center of mass. When the vehicle is stationary on a horizontal road surface, the X axis is parallel to the ground and points forward, the Z axis passes through the vehicle's center of mass and points upward, and the Y axis points to the driver's left side. Characteristics of the vehicle coordinate system: Its origin coincides with the center of mass. Currently, there are several commonly used definitions of vehicle coordinate systems in academia and industry. These include the ISO international standard definition, the SAE (Society of Automotive Engineers) definition, and the IMU (Inertial Measurement Unit)-based coordinate definition. In vehicle dynamics analysis, the ISO-defined vehicle coordinate system is more common. The SAE-defined vehicle coordinate system aligns with the body coordinate system commonly used in aerospace. The IMU-based vehicle coordinate system is more prevalent in IMU-related applications. Regardless of which coordinate system definition is used, as long as it is applied correctly, it can accurately describe the vehicle's position and determine the relative positional relationships between surrounding objects and the vehicle itself.
15
4
Share

Why is there a prompt to calibrate tire pressure?

Car tire pressure calibration refers to the tire pressure monitoring system alerting when there is an issue with tire pressure. It continuously monitors tire pressure in real-time while driving and alerts the driver in case of air leakage or low pressure to ensure driving safety. There are three common types of tire pressure monitoring methods: Direct Tire Pressure Monitoring: Direct tire pressure monitoring devices use pressure sensors installed in each tire to directly measure the tire pressure. The pressure information is transmitted wirelessly from inside the tire to a central receiver module, which then displays the pressure data for each tire. The system automatically alerts when the tire pressure is too low or there is a leak. Indirect Tire Pressure Monitoring: When the pressure in a tire decreases, the vehicle's weight causes the rolling radius of that tire to become smaller, making it rotate faster than the other wheels. By comparing the differences in rotational speed between tires, the system monitors tire pressure. Indirect tire pressure monitoring systems essentially rely on calculating the rolling radius of the tires to monitor pressure. Introduction to Tire Pressure Monitoring System (TPMS): This system combines the advantages of both the above systems. It is equipped with direct sensors in two diagonally opposite tires and a four-wheel indirect system. Compared to a full direct system, this hybrid system reduces costs and overcomes the limitation of indirect systems, which cannot detect when multiple tires simultaneously have low pressure. However, it still cannot provide real-time pressure data for all four tires like a direct system.
5
4
Share

What should be paid attention to when installing new tires?

When installing new tires, the following points should be noted: 1. Choose the appropriate tires. The specifications of the tires should be the same as the previous tires and the other tire on the same axle; 2. The valve should also be replaced, because after replacing the tire, the aging cycle of the new tire and the valve is different; 3. Installation direction and inflation. If the original tires are used, they should be installed according to the manufacturer's requirements. If non-original tires are used, the side with the production date is usually facing outward; 4. New tires should be installed on the rear axle of the vehicle as much as possible. If tires with more wear are placed on the rear axle of the vehicle, the drainage capacity of the rear wheels will be reduced, thereby increasing the risk of driving in rainy days. Therefore, if only two new tires are installed, they should be installed on the rear wheels; 5. Do not brake too hard after replacing new tires; 6. When removing the tire, unscrew the screws diagonally.
17
4
Share

What does it mean when the clutch closes inadvertently?

The meaning of the clutch closing inadvertently is that it occasionally closes without being controlled by the system. Here are some precautions regarding clutch usage: 1. Situations where the clutch is not needed: When the vehicle is driving normally, the foot should not rest on the clutch pedal. While driving, the half-engaged clutch should not be used. In special circumstances where half-engagement is necessary, the duration of half-engagement should be minimized to prevent burning the clutch friction plates. 2. Situations where the clutch is needed: Such as when descending a slope or driving on muddy or icy roads, and when quickly downshifting to a lower gear is required. 3. Clutch release speed: The clutch should not be released too abruptly. Generally, the release is slowest in first gear, and slightly faster in other forward gears. When starting in first gear, the clutch pedal must be fully depressed. When shifting up, the clutch pedal only needs to be depressed until the clutch friction plates disengage before shifting, and does not need to be fully depressed again.
2
1
Share
Cookie
Cookie Settings
© 2025 Servanan International Pte. Ltd.