P0337: Crankshaft Position Sensor “A” Circuit Low

The crankshaft position (CKP) sensor is typically found in distributorless ignition systems. It works the same way as the ignition pickup and trigger wheel, sending timing signals to the powertrain control module (PCM) and helping the computer determine the correct firing sequence. If a problem with the CKP sensor is detected by the PCM, it will log a P0337 code.

What Does the P0337 Code Mean?

Diagnostic trouble code (DTC) P0337 stands for “Crankshaft Position Sensor ‘A’ Circuit Low.”

In a distributorless ignition system, the CKP sensor replaces the distributor shaft in providing timing signal information. The signals sent by the sensor to the PCM is used to monitor the engine’s revolutions per minute (RPMs). Together with the camshaft position sensor, the CKP sensor informs the PCM about valve timing and helps it control the injector and ignition timing.

The CKP sensor is also used to detect abnormalities in the crank speed caused by ignition misfire.

If the CKP sensor’s supply voltage is disrupted, it won’t be able to send the necessary signals for the PCM to initiate the firing sequence, triggering DTC P0337.

Note: The definition of code P0337 might be different depending on the vehicle manufacturer. Consult the appropriate repair manual or repair database for the exact code definition.

What are the Common Causes of the P0337 Code?

• Faulty crankshaft position sensor
• Faulty powertrain control module
• Wiring issues
• Damaged tone ring

What are the Common Symptoms of the P0337 Code?

• Poor engine performance
• Engine cranks but won’t start
• Decreased fuel economy

How to Diagnose the P0337 Code

When diagnosing trouble codes, keep in mind that the steps and protocols for doing so can depend on your vehicle’s year, make, and model. One vehicle might require additional steps than another, so make sure you’re consulting a vehicle-specific guide before proceeding.

Diagnosing a trouble code such as the P0337 typically involves using a scan tool and oscilloscope, which can be tricky if you’re not familiar with how they work. In this case, it might be best to bring your vehicle to your local auto repair shop and have a trained professional diagnose your vehicle for you. But if you’re well-versed with the steps on how to diagnose trouble codes, then you can go ahead and do it yourself.

To help you out, here is a video that shows what the process might involve.

How to Fix the P0337 Code

Attempting to fix a P0337 code can be frustrating and confusing especially if you don’t have the right tools and automotive know-how. Under these circumstances, it’s best to leave the job to a trained professional to ensure that the steps for repairing the problem are being followed correctly.

If you’re someone who knows how to work their way around resolving DTCs, make sure to have all the tools and information you need before starting. Guides like those from Chilton or an ALLDATA subscription contain vehicle-specific repair information, so you might want to check those out before you begin.

Getting Your Hands on a New Crankshaft Position Sensor to Fix DTC P0337

There’s a good chance that a bad crankshaft position sensor is what’s causing the PCM to log P0337 to begin with. Luckily, you can get a replacement that’s not only compatible with your vehicle but built to last from CarParts.com.

The best part? You can order online and get your new crankshaft position sensor shipped straight to your doorstep. We ship orders from strategically located warehouses across the US to ensure fast and efficient shipping.

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