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P0337 is a diagnostic trouble code (DTC) for "Crankshaft Position Sensor A Circuit Low Input". This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation. Our certified mobile mechanics can come to your home or office to perform the Check Engine Light diagnostic for $70.00. Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $30.00 off as a credit towards the repair. All our repairs are backed by our 12-month / 12,000-mile warranty.
This trouble code means that the vehicle’s crankshaft is suffering because of low voltage.
In order for a vehicle to propel itself forward, three things are needed:
In modern vehicles, a third component is at work too: the ECM (Engine Control Module). To put it simply, this high-tech device is at work measuring how much fuel must be injected relative to the measured mass of air at any time. Then, it forces a spark in order to ignite a power stroke. This entire process happens hundreds of times per second.
Obviously, precise timing is necessary to pull this off over and over and over. That’s where the crankshaft and camshaft position sensors (CMP and CKP, respectively) come into play.
The CKP carries out two very important functions. It serves as a speed sensor, for one thing. The ECM relies on it for calculating the engine speed in RPM (Revolutions Per Minute). The second important function served by the CKP is as a position sensor. This makes it possible for the ECM to figure out the position of cylinder one at what’s called top-dead-center (TDC). With RPM and TDC, the ECU can maneuver the precise function we described above that’s required for a vehicle to work.
When the ECU can’t sense sufficient voltage from the CKP sensor, the P0337 code will be stored.
There could actually be a number of causes behind this code, but the most common are:
You most likely have a P0337 problem on your hands if you experience any of the following:
Here’s how a mechanic should diagnose this problem:
A lot of mechanics will replace the sensor if it’s clearly responsible as this is easy enough to do and not incredibly expensive. At most, it will cost around $100 for this part. That being said, replacement isn’t always necessary and the sensor could be fixed with nothing more than a bit of soldering.
Also, the engine needs to be checked to ensure it’s cranking over properly. The same goes for inspecting the battery. Just because it’s “working” doesn’t mean it’s working as it should.
This code doesn’t represent a problem that could get anyone hurt, but it could make starting your vehicle impossible. Even if you can get the engine to turn over, P0337 problems could end up costing you every time you fill up.
More likely than not, a sensor will need to be repaired. If it does need to be replaced, the good news is that it shouldn’t cost much. There could be other electrical problems that will require replacements, but again, your budget shouldn’t hurt too much.
This isn’t the kind of problem that should be ignored because it’s not nearly as severe as other common vehicle issues. As we’ve touched on above, it’s generally pretty affordable to fix P0337 problems too.
YourMechanic will actually send a certified mobile mechanic to your home or place of business to assess and repair your vehicle. We’re happy to provide you a quote upfront or schedule an appointment online to learn more about our services. We also invite you to speak with a service advisor by calling us at 1-800-701-6230.