Engine Mechanical
Crank Position Sensor
A crank position sensor tells the engine computer how fast the crankshaft is turning and where it is in its rotation, so it can time spark and fuel. We list 32 crank position sensors from $18 to $122 for 1988-2022 vehicles, from Mopar, Denso, Motorcraft and others, with fits for the Jeep Cherokee, Grand Cherokee, Wrangler, Honda Odyssey and Toyota Tacoma.
Shop crank position sensor by vehicle
Symptoms of a failing sensor
When the crank sensor signal drops out, the engine computer loses its timing reference. Common symptoms are an engine that cranks but will not start, stalling, often once the engine is hot, and restarting after it cools. You may also see misfires, rough running, a check engine light with a crankshaft position code, or a tachometer that drops to zero while cranking on some vehicles. Heat often makes a failing sensor worse.
Choosing the correct sensor
Crank sensors differ by engine, so pick your year, make and model and check the fitment table for engine size. The connector, mounting flange, sensor length and any spacer or shim must match. On many engines the sensor sits at the front of the crankshaft near the pulley. On others it mounts through the bell housing or the side of the block. Compare the part number on the old sensor with the listing, and check the wiring harness for melted or chafed sections.
Installation tips
Disconnect the battery before you start. Clean the mounting bore and, if your engine uses one, install the new sensor with the correct spacer or air gap from your service manual. Route the wire away from the exhaust and moving parts, and secure it in its original clips. Some vehicles need a crankshaft position relearn with a scan tool after replacement before the misfire monitor will run, so check your service information.
Crank Position Sensor questions
Can a bad crank position sensor cause a no-start?
Yes. Without a crank signal the engine computer may not fire the spark plugs or injectors, so the engine cranks but does not start. It is one of the most common causes of a crank no-start condition.
Why does my engine stall when hot and restart when cold?
That pattern is classic for a crank or cam sensor that fails as it heats up. Once it cools, the signal returns. A scan tool reading engine rpm while cranking can help confirm it.
Do I need to relearn the crank sensor after replacing it?
Some vehicles need a crankshaft variation relearn with a scan tool, especially to clear misfire monitoring. Others need nothing. Check the service procedure for your engine.