![]() ![]() In 2015 and newer Mercedes-Benz cars, engine start is disabled by the engine control module (ECU) and will need to reset with a scanner. The PYRO fuse on the positive battery terminal is designed to blow if the airbags deploy or your car determines that you are involved in an accident. Many cars, such as BMW, automatically disconnect the battery when the airbags blow. What to do if a car won’t start after crashĮven if you try to jump-start the car or replace the blown airbags, seatbelts, SRS module, and pre-tensioners, you may find that your car won’t start after a crash (or hitting a deer). It’s important to have the vehicle assessed by a qualified mechanic to determine the exact cause of the problem and make the necessary repairs. Control module damage: Accidents can cause damage to the control module, which controls the function of the engine, transmission, and other systems.Also, the shifter may have been damaged, and the car does not recognize the shifter is in the park position, which prevents the engine from starting. Transmission damage: An accident can cause damage to the transmission, which can prevent the car from moving or starting. ![]() Fuel system damage: Accidents may cause damage to the fuel tank or lines, preventing the engine from receiving fuel.Airbag deployment: Airbag deployment causes a surge in the electrical system that may damage the battery, alternator, or other electrical components.Tripped inertial switch: A switch that cuts power to the vehicle’s fuel pump after an accident.Electrical system damage: The electrical system may have sustained damage, such as to the battery, alternator, or wiring, which can prevent the car from starting.Damage to the engine: The accident’s impact can cause bent or broken parts, such as the crankshaft or starter motor, which can prevent the engine from turning over.Here are some common causes why a car may not start after an accident: All lights come on, but nothing happens when you turn the key or press START.Ī car may not start after an accident for several reasons ranging from a blown pre-fuse (safety terminal) at the battery negative or positive post to the engine start being disabled by the vehicle in the Motor Electronics control unit.Fault code No CAN message – Engine Control Module.Multiple warning lights on the instrument cluster.Ignition turns on, but nothing happens.The most common symptom is that the engine will not crank after an accident, even if you try to jump-start it. Your airbags will not deploy or protect in case of another accident. The airbags are inoperable if your SRS light is still on after you start the car.Do not operate the vehicle without properly servicing the airbag system and performing a vehicle inspection.Vehicles including Mercedes, BMW, Audi, VW, Honda, Acura, Lexus, Ford, GM, Dodge, and Chryslers will either blow a fuse, or the Engine Control Unit may be programmed to cut off fuel or disable engine start. These systems are disabled to prevent a fire caused by an electrical short or fuel leak. But that’s not all.Ĭritical systems such as the starter or fuel pump are often disconnected. When you get involved in a car accident, the first thing that happens is the airbags deployed. ![]()
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