What are the reasons why a new energy vehicle cannot start even with power?

[Clarence]

The reason why a new energy vehicle cannot start even with power is that there is carbon buildup in the throttle valve, which can be resolved by cleaning the carbon buildup. Additional extended information is as follows: 1. New energy brands include: BYD Yuan New Energy, Roewe ei6, Roewe e550, BMW i8, BMW i3, etc. 2. Taking the Yuan New Energy 2019 EV360 Zhilian Leading Type as an example: The manufacturer of this car is BYD, classified as a compact SUV, with an energy type of pure electric. The dimensions of this car are 4360mm in length, 1785mm in width, and 1680mm in height, with a wheelbase of 2535mm. The body type is a 5-door, 5-seat SUV, equipped with a single-speed electric vehicle transmission and front-wheel drive.

[VonMaria]

Last time my new energy vehicle had this issue, it was caused by the auxiliary battery being completely dead. Although the main battery showed full charge, the starting system relies on this small battery for power. These typically use lead-acid batteries with a lifespan of about three years. Another time, it was a gear position sensor failure - the vehicle system couldn't detect the transmission was in P position and simply refused to start. Metal objects interfering with the key sensing area can also cause this; I once had a failure when keeping my keys with a power bank. I'd suggest checking these common points first before considering high-voltage system faults, as those require professional diagnostic equipment.

[StGenesis]

Over the years of repairing new energy vehicles, I've learned to check three key areas first when encountering such issues. Abnormalities in low-voltage circuits are the most common culprit – use a multimeter to test the auxiliary battery voltage; if it's below 12V, it won't power the starting system. Controller failures are also frequent, including errors reported by the Vehicle Control Unit (VCU) or Battery Management System (BMS), which will proactively cut off high-voltage power. Faulty high-voltage relays pose another hidden danger – I once encountered a case where relay contacts were burnt out, completely blocking current flow. Additionally, winter low-temperature protection mechanisms may prevent startup, usually indicated by a snowflake icon on the dashboard. The most reliable solution is to tow the vehicle to a repair shop for professional diagnostic equipment to read trouble codes.

[JayceLee]

As a seasoned commuter driving a new energy vehicle daily, failure to start with electricity might be related to operational habits. Last time, in a rush, I unplugged the charger before completing the charging process, causing the system to get stuck in charging mode and refuse to start. The failure of remote start via the mobile app could be due to signal issues, which I frequently encounter in underground parking. After unlocking the door with the mechanical key, you still need to press the brake pedal and hold the start button for three seconds. Additionally, power interruption during a system upgrade can cause software malfunctions, requiring a reset of the vehicle's infotainment system. Regular maintenance and checking the control module connectors are essential to avoid signal interruptions caused by oxidation or loosening.

[DelIsaac]

From a technical perspective, the triggering of the high-voltage system protection mechanism is the primary cause. When the vehicle detects an insulation fault, such as water intrusion in the battery pack or damaged wiring, it will automatically cut off the high-voltage power. A malfunction in the charging port microswitch can cause the system to mistakenly assume it's in charging mode. Additionally, if there's an abnormality in the drive motor's resolver sensor and the controller cannot confirm the rotor position, it will also refuse to start. Using an OBD scanner can reveal specific fault codes, with P0AA6 being a common high-voltage interlock loop issue. It's recommended to first try disconnecting the negative terminal of the auxiliary battery for five minutes to reset the system and then observe the situation.

[JackRose]

As a new energy vehicle owner who frequently drives long distances, I once encountered this situation at a highway service area. That time, it was due to a DCDC converter failure, which prevented the auxiliary battery from charging. Although the main battery was fully charged, the system couldn't be started. Another issue is when winter temperatures are too low, triggering battery protection, requiring waiting until the battery heats up above zero degrees. Incorrect scheduled charging settings can also lock the system—I once set a timer but forgot to cancel it. The lesson learned is to always carry an emergency power supply in the car. When facing auxiliary battery issues, you can jump-start the vehicle, solving about 80% of such unexpected situations.