Rick's Free Auto Repair Advice

P0344 code — What this Camshaft Position Sensor Code Means

Learn What A Camshaft Position Sensor Circuit Intermittent P0344 Code Means and How to Fix It

A P0344 code is defined as: Camshaft Position Sensor Circuit Intermittent. When car makers eliminated the distributor they needed a way to know the position of the camshaft so they could fire the spark plugs at the correct time. So the camshaft position sensor takes the place of the distributor and helps time the spark to the proper cylinder.

When you see a P0344 code, the computer is telling you that it’s seeing an intermittent signal coming from the camshaft sensor.

Most common causes of a P0344 code

Defective camshaft position sensor
Intermittent wire connection at the sensor connector or in the wiring harness
Chipped or missing teeth on the crankshaft tone ring

How to diagnose the problem with the camshaft position sensor signal

This image shows a typical camshaft position sensor

Typical camshaft position sensor

Always start by checking the condition of the wiring harness near the camshaft position sensor. Look for signs of chaffing, rub-through or cut wires. Next, disconnect the connector to the sensor and check for bent/loose pins or corrosion. Repair the problem if you find one.

Follow that up with voltage checks using a shop manual to locate the expected voltages.

Diagnosing the sensor itself for intermittent operation is difficult for DIYers because the best way to test is with a scope. If the wiring harness checks out, check the condition of the tone ring before replacing the sensor.

The sensor operates just like a wheel speed sensor where it monitors a tooted ring on the crankshaft. A chipped or missing tooth can cause a P0344 code.

© 2012 Rick Muscoplat

Posted on by Rick Muscoplat



Custom Wordpress Website created by Wizzy Wig Web Design, Minneapolis MN