What Are Most Common Functional Problems With Crank Position Sensors?


Quick Answer

The most common functional problems with crank position sensors include failure of the engine to crank, missing or intermittent crank signal, the service engine light glowing and misfiring cylinders. Other problems include hesitation in acceleration, erratic starts, unnecessary engine vibration and irregular car function.

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Full Answer

A faulty crankshaft position sensor causes fuel injection failure, which may present the engine cranking. When the crank position sensor fails completely, the ignition and fuel systems shut down, causing the engine to crank but not start or to stall if it was already running. If the crank sensor sends a signal showing a wrong crank position, it may cause rough idling and loss of power.

When high heat levels cause the sensor to stop working, the vehicle’s computer turns on the check engine light when the car is running. A defective sensor can cause the computer to get incorrect information regarding the piston position, resulting in misfiring of one or more cylinders. Unknown cylinder position also sometimes hinders acceleration. Additionally, the engine power becomes defective and the mileage stops recording properly when the sensor is faulty, and a defect in the circuitry of the crankshaft sensor may cause a car to experience problems when starting.

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