Most fuel pumps will produce just a quiet hum when they are running smoothly and they are not damaged, but a very loud whining noise indicates a problem with the fuel pump. This bad fuel pump can throw a check engine light if not fixed in time.

Will a bad fuel pump throw a check engine light?

A weak fuel pump may throw off your car's air/fuel ratio, causing the engine control module (ECM) to turn on the check engine light. In some cases, pump electrical issues may trigger the light as well.

Will a bad fuel pump show a code?

Bad Fuel Pump, Fuel Pressure Sensor Can Trigger 'Check Engine' Light, P0087 Code. ... The light is part of your vehicle's on-board diagnostics (OBD) system and can indicate anything from a loose gas cap to a major repair like a catalytic converter. Here's another example of a problem that can trigger the light…