P0338 Code: Crankshaft Position Sensor “A” Circuit High Input

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.

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?

• Faulty CKP sensor
• Faulty CKP sensor wiring
• Damaged reluctor ring
• Failed PCM

What are the Common Symptoms of the P0338 Code?

• Illuminated check engine light
• Engine refuses to start
• Stalling
• Tachometer doesn’t register the engine’s RPM
• Decreased engine performance
• Decreased fuel efficiency

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.

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.

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.

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