P0349 Code - Camshaft Position Sensor 'A' Circuit Intermittent Bank 2

What Does P0349 Mean?

The camshaft position sensor works with the notches, or teeth, on your camshaft to regulate ignition timing and fuel delivery. This code means that there is a deviation that is placing your camshaft in a bad position. When this happens, your Check Engine Light will come on, and a P0349 code will be stored. Some vehicles will do this on the first occurrence, but others will require at least three occurrences before activating the Check Engine Light. The code will still be stored, but the light will not come on.

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What are the common causes of P0349 ?

Depending on year, make, and model, DTC P0344 or P0349 may have number of causes. Here are some of the most common.
Faulty Sensor – If the sensor coil is open or shorted, then it will generate no signal.

Poor Installation – A good CMP signal is highly dependent on placement. Generally, the sensor needs between 0.020” and 0.050” clearance to the reluctor ring or camshaft tooth. If the sensor is cocked to one side or not firmly seated, the clearance will be wrong and the signal will be too weak for the ECU to detect. If the reluctor ring is rubbing on the sensor, the signal will be distorted.

Ford Trucks / Mustang GT – An alternator phase problem, such as a blown diode or open coil, may cause so much electrical interference that the CMP signal gets distorted, causing a P0344 / P0349 DTC to set, among others, in spite of there being no actual problem with the CMP sensor or wiring.

Cars in Storage – If your car has been in storage for any length of time, rodents may find it a great nesting place. Unfortunately, while looking for nesting materials and cleaning house, these little critters might find your wiring offensive or even tasty, resulting in open circuit problems.

Older Cars – Over time, plastic and rubber tends to become brittle and less flexible, which can lead to connector breakage and wire insulation damage. In turn, this may cause corrosion, open circuits, or short circuits.

Generally, the camshaft position sensor is pretty resilient and long-lived, which doesn’t necessary rule it out as a problem, but most of the time, the problem lies in the wiring and connectors for the sensor, or something else entirely. Before you just jump right on a new sensor, make sure you can rule out the rest of the system, first.

How do you troubleshoot P0349 ?

The engine system, in conjuction with the engine control module (ECM)/powertrain control module (PCM), activates the P0349 code solenoid valve to control oil pressure to the engine mechanism that is installed in the valve system to switch valve timing between Low and High.If the engine solenoid valve has an open or short circuit, a DTC is stored.

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