At what voltage can a car battery not start the engine?

1 Answers
DiJeremiah
07/29/25 9:57am
Car batteries cannot start the engine when the voltage drops below 11V. Precautions for using car batteries include: 1. Parking: Avoid leaving the car parked in open-air parking lots for extended periods. 2. Starting: Avoid multiple consecutive attempts to start the engine. 3. Inspection: Regularly check battery components and connection circuits. 4. Shutdown: Do not use car electronics after turning off the engine. Car batteries, also known as storage batteries, work by converting chemical energy into electrical energy. Their functions are: 1. Power supply: Providing power to the car's starter and ignition system; supplying stable DC power to car electronics. 3. Voltage stabilization: Mitigating impact voltage in the motor to protect electronic equipment in the car. 4. Energy storage: Storing excess electricity generated by the alternator.
Was this review help?
8
0
Share
More Forum Discussions

What is the fault when the catalytic efficiency of the car catalyst is low?

Low catalytic efficiency of the car catalyst may be caused by the use of leaded gasoline or a malfunctioning oxygen sensor in the car leading to excessively low efficiency. Below is an introduction to the related content of the three-way catalytic converter: Three-way catalytic converter: The three-way catalytic converter is the most important external purification device installed in the car's exhaust system. It converts harmful gases such as CO, HC, and NOx emitted from the car's exhaust into harmless carbon dioxide, water, and nitrogen through oxidation and reduction reactions. Purifying agent: When high-temperature car exhaust passes through the purification device, the purifying agent in the three-way catalytic converter enhances the activity of the three gases CO, HC, and NOx, promoting certain oxidation-reduction chemical reactions. Among them, CO oxidizes at high temperatures into colorless, non-toxic carbon dioxide gas; HC compounds oxidize at high temperatures into water (H2O) and carbon dioxide; NOx is reduced into nitrogen and oxygen. The three harmful gases are transformed into harmless gases, thereby purifying the car's exhaust.
12
5
Share

Can the Mechatronic Unit Be Repaired If It's Broken?

No. The transmission mechatronic unit is highly susceptible to high temperatures. Here is some relevant information about the transmission mechatronic unit: Function: The transmission mechatronic unit is the control center of the transmission. Its input circuit receives signals from sensors and other devices, then filters, processes, and amplifies these signals before converting them into electrical signals to drive the controlled solenoid valves. The mechatronic unit also manages the vehicle's shifting logic, ensuring the transmission better matches the engine's operating state, thereby enhancing the controllability of the vehicle's power, acceleration, and smoothness. Relationship with Temperature: The damage to the mechatronic unit is largely related to high transmission temperatures. During aggressive driving, the temperature inside the clutch plates or torque converter can become extremely high. This heat can cause the electronic control unit to malfunction, and typically, the only solution is to replace the unit with a new one.
2
0
Share

Should the Rubber on the Crankshaft Pulley Be Replaced if It's Aged?

If there are abnormalities, it should be replaced. Even if the belt wear is not severe, the engine belt idler pulley should also be replaced. Correct mistakes promptly: Some engines use flat-shaped fan belts. When installing them on the pulley, check the fit between the belt and the pulley. The flat-shaped belt should fit well with the pulley; otherwise, the belt's service life will not be long. Some models use V-belts, and if any errors occur, they should be corrected promptly. Risks of not replacing: If not replaced in time, driving may sometimes cause excessive idler pulley wobbling, accelerating belt wear. In some cases, the idler pulley may seize and grind the belt down completely, or the pulley itself may detach, causing the belt to disengage. This results in the loss of power to the engine's generator, water pump, power steering pump, air conditioning pump, and other components that rely on engine power, leading to vehicle breakdown and inability to operate normally.
5
1
Share

Which Unit Tests Diesel Quality?

Diesel testing is conducted at the local Bureau of Quality and Technical Supervision. Below is relevant information about the Bureau of Quality and Technical Supervision: Definition: The Bureau of Quality and Technical Supervision is one of the national functional departments. At the national level, it is known as the State Bureau of Quality and Technical Supervision. In 2001, it merged with the State Administration for Entry-Exit Inspection and Quarantine to form the General Administration of Quality Supervision, Inspection and Quarantine (AQSIQ), a ministerial-level agency. Below the provincial level, Bureaus of Quality and Technical Supervision are established, with provincial bureaus implementing vertical management over municipal, county, and district bureaus. Organizational Structure: Generally, a municipal-level Bureau of Quality and Technical Supervision includes departments such as the Special Equipment Safety Supervision Division, Quality Division, Metrology Division, Standardization Division (with subordinate Organization Code Management Office), Legal Affairs Division, Administrative Service Center, Supervision and Inspection Division (Inspection Team), XX City Anti-Counterfeiting Office, 12365 Complaint Reporting Center, Quality Inspection Institute, Metrology Institute, Special Equipment Inspection Institute, Fiber and Cotton Inspection Institute, and Barcode Center, among others.
16
5
Share

How many points can a new driver deduct in the first year?

During the first-year probation period of a C1 driver's license, a maximum of 11 points can be deducted. For C-class licenses and motorcycle driver's licenses, as long as the points do not reach 12 during the probation period, there will be no issues, and the probation period will not be extended. However, if 12 points are accumulated during the probation period, the license will be directly revoked, and the driver will need to retake the driving test from scratch to legally drive again. Therefore, it is crucial for C-class license holders not to accumulate 12 points during the probation period—the maximum allowable is 11 points. No other adverse consequences: If a new driver accumulates 6 points, as long as the traffic violation fines are paid, the 6 points will be cleared and will not carry over to the next scoring cycle, nor will they result in any other negative consequences. Probation period extended by one year: However, for large passenger vehicles, tow trucks, city buses, medium-sized passenger vehicles, and large truck driver's licenses, if 6 or more points (but less than 12) are accumulated during the one-year probation period, the probation period will be extended by one year.
7
5
Share

What are the troubleshooting steps for a complete power loss in diesel vehicles?

The car's generator may have malfunctioned or there could be an issue with the electrical circuit. Below is relevant information about diesel vehicles: Precautions: Pay attention to excessively high engine coolant temperature. First, move the vehicle to a ventilated and shaded area. Open the engine hood and wait for the coolant temperature to decrease. If it's necessary to open immediately, use a large towel soaked in water to cover the coolant reservoir cap, then attempt to slowly open it. When steam emerges, quickly move your hand away and wait until the steam completely dissipates before finally opening the reservoir cap to add coolant. Scrapping timeline: When the mileage reaches 600,000 kilometers, mandatory scrapping is enforced, but the specific condition of the vehicle should also be considered. For commercial vehicles, the scrapping period is 8 years. Each vehicle has its own scrapping timeline from the date of purchase, as stipulated by national transportation authorities through a regulatory system that specifies safety inspection requirements based on seating capacity and usage duration during the vehicle's operational life.
17
5
Share
Cookie
Cookie Settings
© 2025 Servanan International Pte. Ltd.