modern vehicles are jam-packed full of sensors that keep everything operating the way it should. but while all these electronics create far more efficient and powerful vehicles, they can also create massive headaches when something goes wrong.
one of the most critical sensors in your vehicle is the crankshaft position sensor. but what does this sensor do, where you can find it, and how much does it cost to replace it? we’ll answer all those questions and more in this comprehensive guide. let’s take a quick look at the common symptoms first:
the most common symptom of a bad crankshaft position sensor is a check engine light on your dashboard. you will often also experience a stalling engine or bad engine performance. in rare cases, you will also notice engine vibrations or misfires.
but while these are the most common symptoms, they aren’t the only signs that can point you in the direction of a faulty crankshaft position sensor. we’ll take an in-depth look at the six most common symptoms of a bad crankshaft position sensor below to help you diagnose your vehicle.
bad crankshaft position sensor symptoms
1. check engine light
like we said before, the most common symptom of a bad crankshaft position sensor is a check engine light. the good news is that if you have a check engine light, then your ecm has reverted to default measurements.
while this might cause a few performance issues, it should help prevent further damage from occurring. however, the longer you leave the problem unaddressed, the worse it will become.
2. excessive engine vibrations
if your engine has a faulty crankshaft position sensor, then it isn’t optimizing any performance. even worse, it might be utilizing incorrect readings to determine fuel and ignition timing. if the ecm doesn’t time things correctly, you’re in for a bumpy ride.
even worse, the problem is only going to get worse until you fix it, and it’s only a matter of time until further damages occur.
3. reduced engine performance
whether you have a check engine light or not, a faulty crankshaft position sensor will lead to reduced engine performance. whether it’s default values or the wrong values entirely, anything less than optimal timing is going to reduce your overall performance.
top speed and acceleration are the two most significant areas that you are going to see reduced performance.
keep in mind that an engine that isn’t performing correctly is also going to have a reduction in fuel economy, but unless you’re paying close attention to how many miles you get out of each tank, you might not notice.
4. difficulty starting your vehicle
if your defective crankshaft position sensor is extremely out of sync, you might have trouble getting your vehicle started. furthermore, you might have difficulty keeping it started.
this is usually only a problem when the problem has persisted for some time, and you likely have various other underlying issues too. moreover, it’s not usually a problem if you have a check engine light and the ecm has defaulted to predetermined values.
instead, it’s a problem when the crankshaft position sensor is feeding inaccurate readings and your ecm doesn’t realize it.
5. engine stalling
while this indicates a severe fault, it’s possible that a faulty crankshaft position sensor could lead your vehicle to stall. this happens when the ecm is sending all the wrong fuel and ignition timing to each cylinder.
typically, it will take a while for a problem to get this bad, and if it is, there’s a good chance there’s further damage that you’ll uncover after you replace the crankshaft position sensor.
6. engine misfires
while it’s unlikely that a vehicle with a check engine light on will misfire, if the ecm uses incorrect positions of the crankshaft, it’s incredibly likely. even worse, if you have an engine that’s misfiring, it’s only a matter of time until engine damage occurs.
the longer you let a misfire happen, the worse it’ll get, and the more expensive the eventual repairs will be. if you have a misfire, get repairs as soon as possible.
related: 6 symptoms of an engine misfire
crankshaft position sensor function
the purpose of the crankshaft position sensor is to measure the position of the crankshaft. it might sound redundant, but it’s one of the most critical sensors in your vehicle. the crankshaft position sensor sends these measurements to the ecm, and the ecm uses them to optimize the rest of your vehicle’s timing.
if the crankshaft position sensor fails, then the ecm reverts to default values. while these values keep the engine running, you’ll likely notice various performance issues.
however, if the ecm doesn’t realize that the crankshaft position sensor has failed and is sending it errant measurements, the computer will optimize performance to inaccurate readings. this can quickly lead to more damage and expensive repairs.
crankshaft position sensor location
your vehicle’s crankshaft position sensor is located near the bottom of the engine by the crankshaft. that makes sense because it’s the crankshaft position sensor’s job to measure the crankshaft location.
when you’re trying to track down the crankshaft position sensor, look towards the engine’s bottom, 2022世界杯榜 ly on one of the sides. since the sensor is so far down in the engine, it can be hard to locate and even harder to remove and replace if you have a faulty one.
crankshaft position sensor replacement cost
the average crankshaft sensor replacement cost is between $150 and $250. however, it’s not uncommon for those prices to skyrocket if you have a higher-end vehicle.
that’s because the labor costs are typically between $90 and $110. from there, the rest of the cost comes down to parts. while most crankshaft position sensors cost under $100, there are a few out there that can blow through that price point.
fortunately for most drivers, those more expensive parts are typically only on high-end luxury vehicles. if you’re looking to save a few bucks, you can replace the sensor yourself. it’s a pretty straightforward job if you can reach the sensor.
while this is only going to save you about $100, if you’re a little mechanically inclined, you can complete the entire job in under 30 minutes.
there are actually some car models, even if it is very rare, but they can be located behind the flywheel, so you have to remove the gearbox to replace the sensor.
i had all my coils and spark plugs replaced 5 months ago on my 03 grand marquis. last month my check engine came on it said coil 2 was misfiring. i replaced and everything seemed fine. then yesterday the light came on again and it said coil 4 was misfiring. this seems unusual since all the coils were replaced with new ones last summer. what do you believe is going on? i was told by a friend that it could be the crankshaft sensor. i am wanting to take holiday trip in 3 weeks but am concerned about car performance.
victor roberto lares
my 2000 buick le sabre will have a rough start on the mornings and some times will not start in the fall and winter seasons. in the spring and summer seasons the car starts up and runs with no issues. for the past three years- same behavior. on my code reader i get p0300- random/multiple cylinder misfire and i also get p1374- crankshaft high to low resolution frequency. i've noticed that when the outside temp is above 90 degrees the car will run perfectly fine. can you point me in the right direction on how to proceed? i already changed the spark plugs and wires. i changed the crankshaft sensor 3years ago.
thank you and god bless you for caring enough to share your knowledge with us... i have a 93 chevy k1500 4x4 with a 305.. been presenting all symptoms described for a long time.. been to several mechanics that could not fix her.. last week she finally stopped.. will start and run a couple of min. then dies, with a poof thru carb. obd1 not very helpful.. will try ty his fix..
hello i have a renault clio 1.4 16v year 2000.i have a dificult start but when start the car motor stop when is hot in normal temperature then not start again and need to whait after is cold too star.thnx
i have symptoms of a bad crank shaft sensor. i have replaced the sensor but still getting the code 12. toyota camry sxv20 5sfe 2.2 i have checked the trigger wheel and it is all good. i also checked resistance of the new sensor and is within specs. i am at a lose as to what else could be the cause.
my check engine light came on. the ecm was replaced but the check engine light came back on with the same code indicating a faulty ecm. what is the real problem?
my 2009 honda city engine stops while driving but starts again immediately...during the engine stops the power steering becomes heavy ang hand brake indicator lights up and also the radio shuts off for a moment.what could be the problem.please help
efren panto jr.
please! help me. an isuzu 4hl1 engine. after a top overhaul the engine will not start what to do
thanks a lot! this site is wonderful.
harold peter dannug
is there any chance that ckp sensor cant be scanned by scanning tool
yes it's actually pretty common that the engine control unit can't recognize any disorders from the crankshaft position sensor.
first of all i would to thank you. you are a great help to many people one of them is me salah senussi from libya . god bless you my new friend
thanks a lot for your comment salah! appreciated