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Summary
  • Your vehicle might log a P0338 trouble code when the engine computer detects an issue with the crankshaft position sensor.
  • The P0338 trouble code can trigger a no-start condition if left unresolved.
  • Aside from an illuminated check engine light, stalling, unusual RPM readings, and poor engine performance are common symptoms of a logged P0338.

The crankshaft position sensor (CKP) sends information to the powertrain control module (PCM) about the crankshaft’s position and rotation speed. The engine uses this information along with information from other sensors to determine ignition timing and fuel injector synchronization. If you think your vehicle’s CKP is faulty, you should connect a scan tool to check if a diagnostic trouble code (DTC) like the P0338 has been stored.

What Does the P0338 Code Mean?

DTC P0338 stands for Crankshaft Position Sensor “A” Circuit High Input. The PCM triggers this code when it detects a voltage signal from the CKP that is too high.

The CKP sensor scans the grooves of a reluctor ring using a magnet. This reluctor ring spins at the same rate as the crankshaft. Every time a groove passes over the CKP sensor, the magnetic field is interrupted, which then corresponds to signals sent to the PCM. The PCM is programmed to be able to translate this into information on how fast the crankshaft is spinning as well as its position.

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crankshaft position sensor image
The PCM triggers the code P0338 when it detects a voltage signal from the CKP that is too high.

This code can be categorized as a severe DTC because it might trigger a no-start condition, which can prevent the engine from being started. Even if the engine starts while this code is triggered, there is a high risk that it might prevent the engine from starting in the future.

Note: The definition of code P0338 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 P0338 Code?

What are the Common Symptoms of the P0338 Code?

instrument panel with tachometer
Your car’s tachometer may not be registering the engine’s RPM if it has a logged P0338 code.

How to Diagnose the P0338 Code

Diagnosing a P0338 usually involves using a voltmeter and inspecting the concerned electrical components for damaged or corroded wiring and connectors. The process can have various additional steps, depending on the vehicle’s year, make, and model. If you aren’t familiar with your vehicle, it’s best to have a certified mechanic do the job for you.

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But if you think you can handle the task on your own, take a look at the video below to learn more about the diagnostic process.

How to Fix the P0338 Code

Attempting to fix a P0338 code’s underlying issues can be a frustrating and confusing task, especially without the right tools and technical information. It might even lead to more issues and a more expensive repair bill if done incorrectly. Under these circumstances, bringing your vehicle to a trained professional might be your best bet to resolve the issue.

But if you’re someone who’s dealt with trouble codes before, then you probably know that umbrella fixes don’t exist. So before you proceed with working on your vehicle, make sure to have the right information. Chilton guides or an ALLDATA subscription contain vehicle-specific repair information, so you might want to check those out before you begin.

Where to Get a New Crankshaft Position Sensor for Your Vehicle

A damaged crankshaft position sensor definitely takes the fun out of driving. And the longer you put off replacing it, the less time you’ll have to enjoy your favorite destinations.

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Find the best crankshaft position sensor replacement for your vehicle to resolve the P0338 code here at CarParts.com. Carefully handpicked by a team of industry professionals, our crankshaft position sensors are guaranteed to last a long time.

Start shopping by entering your vehicle’s year, make, and model into our vehicle selector. This will narrow down the catalog to compatible crankshaft position sensors for your ride. You can also use the search filters to enjoy a more personalized shopping experience.

It only takes a few minutes to place your order. Shop now, and we’ll deliver the part you need straight to your doorstep in as fast as two business days.

Enjoy the best deals on top-notch crankshaft position sensors when you shop from us. All our products come with a low-price and lifetime replacement guarantee, helping you get the best value for your money.

Don’t miss out on the best deals on the market, and shop for an OE-grade crankshaft position sensor today!

About The Authors
Written By Automotive and Tech Writers

The CarParts.com Research Team is composed of experienced automotive and tech writers working with (ASE)-certified automobile technicians and automotive journalists to bring up-to-date, helpful information to car owners in the US. Guided by CarParts.com's thorough editorial process, our team strives to produce guides and resources DIYers and casual car owners can trust.

Reviewed By Contact Center Manager and Technical Reviewer at CarParts.com

William “Bill” Guzenski has produced hundreds of how-to videos for the automotive community. He’s an ASE Certified Master Automobile Technician, and is affiliated with the Specialty Equipment Market Association (SEMA). He loves attending race events and car shows throughout the country, as well as traveling in his 40-foot motorhome, exploring abandoned mines and ghost towns.

Any information provided on this Website is for informational purposes only and is not intended to replace consultation with a professional mechanic. The accuracy and timeliness of the information may change from the time of publication.

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