P0339 Code - Crankshaft Position Sensor 'A' Circuit Intermittent

What Does P0339 Mean?

The catalytic converter has an oxygen sensor in front and behind it. When the vehicle is warm and running in closed loop mode, the upstream oxygen sensor waveform reading should fluctuate. When you see P0339 engine fault code on your engine code reader this description will help you.

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What are the common causes of P0339 ?

Depending on year, make, and model, DTC P0339 may have number of causes, pretty much the same as those causing DTCs P0335, P0340 or P0345:

• Faulty Sensor – If the sensor is open or shorted, due to age, damage, or corrosion, a weak signal or no signal will be generated.
• Poor Installation – A good CKP signal is highly dependent on sensor placement. Generally, the sensor needs between 0.020” and 0.050” clearance to the reluctor ring. 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 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 it distorts the CKP signal, causing DTC P0339, in spite of there being no actual problem with the CKP sensor or wiring.
• Cars in Storage – 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.

How do you troubleshoot P0339 ?

Now, clear the codes and test-drive the vehicle to see if the code is reset. With the valve disconnected, the red voltmeter lead should be attached to the IMRC valve power wire and the black voltmeter lead connected to ground.

Process Tips

Diagnostic trouble code P0339 is not difficult to diagnose and repair. Thus, it always pays to have a qualified technician to look after your vehicle should this error code arise.

Diagnosing this code requires the engine to be in good running shape, without unmetered air entering the engine. If other codes that relates to misfiring condition, lean running or air entering the engine is present, then you must first fix those error codes before P0339.

Fortunately, P0339 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

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