Crankshaft Sensors

What causes the failure of a crankshaft sensor?

Crankshaft position sensors typically fail due to extreme engine heat, vibration, oil contamination, or exposure to microscopic metal particles from normal engine wear. Road salt and moisture can corrode the electrical terminals at the sensor plug, and the internal wiring and plastic housings of crankshaft position sensors can degrade over time, leading to erratic signals or engine failure. In some cases, the sensor is functional, but a frayed, cracked, or loose wire prevents the signal from reaching the Engine Control Unit (ECU).

When a crankshaft position sensor fails, the engine control unit (ECU) loses track of engine speed and piston positions, leading to mistimed fuel injection and ignition timing. This typically results in hard starts, unexpected stalling, rough idling, engine misfires, and a loss of power.

Common indicators of a failing crankshaft sensor include:

• Crank-no-start: The engine may crank longer than usual before starting or refuse to start entirely.

• Stalling: The vehicle may suddenly shut off while driving or sputter and die at a stoplight.

• Rough idle: The engine may shake, vibrate, or surge while parked or in neutral.

• Misfires and poor acceleration: The vehicle may misfire, hesitate during acceleration, or experience a noticeable loss of power.

• Check Engine Light (CEL): A faulty crankshaft sensor almost always triggers a diagnostic trouble code, commonly P0335.

Restore proper engine performance

When a replacement is needed, VDO Crankshaft Sensors can restore the engine's original operation and provide reliable service for years to come. Professional technicians can rely on VDO Crankshaft Sensors for repairs they can be confident in.