What is the fault when the EPC light is on and the car cannot start?

1 Answers
SanEden
07/29/25 7:50pm
EPC light on and failure to start indicates a malfunction in the vehicle's mechanical and electronic systems. The specific reasons are as follows: 1. Reason one: Excessive carbon buildup in the throttle body, causing issues with its opening angle. 2. Reason two: Engine misfire or cylinder failure, leading to abnormal throttle operation. 3. Reason three: Air leakage behind the throttle body, resulting in abnormal data detected by the intake pressure sensor. Relevant information about EPC is as follows: 1. EPC: Stands for Electronic Power Control, commonly known as the electronic throttle system. 2. Components: The system mainly consists of the engine control unit, engine wiring harness, throttle body, accelerator pedal, brake switch, and clutch switch for manual transmission.
Was this review help?
6
1
Share
More Forum Discussions

What Are the Reasons for Low Engine Oil Pressure?

Engine oil pressure may be low due to insufficient oil quantity, low oil viscosity, or poor oil pump performance. Engine oil serves functions such as lubrication and wear reduction, auxiliary cooling, sealing and leak prevention, rust and corrosion protection, as well as shock absorption. If the engine oil pressure is low, it is necessary to promptly identify and resolve the issue. Detailed explanations: 1. Use of inferior oil: Sludge blockage caused by engine oil. After using inferior oil, sludge is prone to form inside the engine, which can block the oil passages. The solution is to switch to high-quality oil, preferably following the vehicle's oiling instructions. 2. Oil passage blockage: An engine with blocked oil passages will have reduced oil flow, which can easily lead to insufficient engine oil pressure. In this case, the blocked oil passages need to be cleaned. 3. Low oil viscosity: If the oil viscosity is too low, the oil pump cannot press the oil into the oil passages. The natural solution is to change the oil.
3
2
Share

What kind of engine oil should be used for the 2021 Bora?

The Volkswagen Bora originally uses semi-synthetic engine oil with the specification SM5W-40. Below is relevant information about the Bora: 1. Product Features: 7 major upgrades + 5 additional configurations comprehensively enhance riding comfort. The 2011 Bora 1.4T model not only provides consumers with a significant improvement in driving pleasure through enhanced power and handling but also achieves a new level of riding comfort through comprehensive upgrades in interior and exterior design as well as configurations. It is reported that the 2011 Bora 1.4T model features 7 major upgrades and 5 additional configurations, including improvements such as a frameless wiper, rear-window antenna, split front grille, new wood grain interior trim, chrome package, aluminum brushed interior trim, and a redesigned leather steering wheel, as well as new additions like the choice of upper gray and lower black interior, USB port, Aux-in audio interface, secondary door unlocking function, and a driver-side sun visor with a vanity mirror. 2. Appearance Overview: The wheelbase of the 2011 Bora is 97mm longer than that of the previous model, reaching 2610mm, which is close to the wheelbase of many B-segment cars. This increase in wheelbase significantly expands the interior space of the 2011 Bora, with almost all the additional length used to improve rear seating space, greatly enhancing the comfort for rear passengers.
19
3
Share

What Are the Reasons for a Sudden Increase in Fuel Consumption in a New Car?

The reason for a sudden increase in fuel consumption in a new car is a malfunctioning oxygen sensor, which requires inspection and repair at a 4S shop. Below is relevant information about the oxygen sensor: 1. Introduction: The oxygen sensor is used to detect the concentration of oxygen in the exhaust and sends feedback signals to the ECU. The ECU then adjusts the fuel injection volume of the injector to keep the air-fuel ratio of the mixture near the theoretical value. 2. Function: The sensor measures whether there is excess oxygen in the exhaust after engine combustion, i.e., the oxygen content, and converts this information into a voltage signal sent to the engine computer. This allows the engine to achieve closed-loop control based on the excess air factor, ensuring that the three-way catalytic converter maximizes the conversion efficiency of hydrocarbons (HC), carbon monoxide (CO), and nitrogen oxides (NOx) in the exhaust, thereby optimizing the conversion and purification of emission pollutants.
18
1
Share

What is the valve-like warning light?

The valve-like warning light is the engine malfunction indicator. Below are the specific causes of engine malfunctions: 1. Sensor failure: Including coolant temperature, crankshaft position, air flow, intake air temperature, oxygen sensors, etc. When these sensors are damaged, have poor contact, or experience signal interruption, the vehicle's ECU cannot accurately obtain engine data, triggering the engine warning light. 2. Poor maintenance: Inadequate engine maintenance is the most common cause of engine warning light activation. Vehicles have specific maintenance schedules, and failure to adhere to these schedules combined with poor driving habits increases the engine's operational burden. 3. Fuel quality issues: This includes both fuel and engine oil. The fuel used in cars typically has specific octane ratings, while engine oil comes in semi-synthetic and fully synthetic varieties. Failure to use the required specifications can lead to engine wear over time. 4. Poor combustion mixture: Issues such as faulty spark plugs, ignition coils, fuel pump failures, or clogged fuel lines can cause poor combustion in the engine. This leads to carbon buildup or engine knocking, which the oxygen sensor detects and reports to the ECU, triggering the warning light as an alert.
14
3
Share

Which Puts Less Pressure on the Lumbar Spine: Sedan or SUV?

SUVs exert less pressure on the lumbar spine and cervical spine compared to sedans. This is because sedan seats are relatively low, causing the driver to sink into the seat. To achieve comfort, one might recline while driving, which requires extending the neck forward to see the road, thereby increasing the load on the neck. The correct sitting posture should resemble that of buses, high-speed trains, or airplanes, which minimizes lumbar spine pressure and is suitable for long-distance travel. From this perspective, SUVs more closely approximate this ideal posture. Differences between sedans and SUVs: 1. Chassis: Sedans have a lower chassis and, consequently, a lower center of gravity, resulting in smaller vehicle tilt angles during turns. SUVs have a higher chassis, enabling them to adapt to various road conditions. 2. Seat Comfort: SUVs tend to favor a sporty style, often featuring firmer seat designs. Sedans prioritize passenger comfort, typically offering softer seats. 3. Fuel Consumption: SUVs are generally designed with off-road capabilities in mind, making them heavier than sedans and equipped with larger engine displacements, leading to higher fuel consumption in comparison.
6
0
Share

What is the function of Nissan ECO?

ECO stands for the economic driving mode function of a car. ECO is an English abbreviation formed by the combination of Ecology (environmental protection), Conservation (energy saving), and Optimization (power). The Eco mode is further divided into active Eco driving mode and non-active Eco driving mode. When the Eco indicator light on the dashboard illuminates, it indicates that the vehicle's economic mode has been activated. Eco mode is categorized into active and non-active types. The difference lies in the fact that the active type has a dedicated button, allowing the driver to choose whether to activate it. When the driver presses the Eco mode switch, the dashboard indicator light immediately turns on, and the vehicle automatically begins adjusting settings such as throttle opening, transmission shift logic, and air conditioning output power. Non-active Eco mode does not have a dedicated button. When the Eco indicator light on the dashboard illuminates, it serves merely as a reminder function. Eco automatically evaluates your driving behavior. If your current driving operation achieves the optimal fuel supply, the dashboard will simultaneously display the Eco indicator light. Most cars employ the active Eco driving mode, meaning they have a dedicated switch button. Thus, during daily driving, you can activate Eco mode. However, it is unnecessary to enable Eco mode when driving at speeds exceeding 120 km/h, during idle parking, in N/P gear, or in manual mode, especially when climbing hills. Doing so would fail to demonstrate the fuel-saving characteristics of Eco and could negatively impact power. Additionally, Eco mode typically becomes ineffective under the following circumstances: When the vehicle speed exceeds 120 kilometers per hour, the car prioritizes speed, causing the Eco mode to automatically deactivate. During idle parking or when in N/P gear or manual mode, Eco may also become ineffective. When high torque output is required, such as when climbing a hill, the engine control unit prioritizes ensuring sufficient power to drive the vehicle, and the Eco mode will not function.
18
5
Share
Cookie
Cookie Settings
© 2025 Servanan International Pte. Ltd.