Possible causes

– Faulty Camshaft Position Sensor
– Camshaft Position Sensor harness is open or shorted
– Camshaft Position Sensor circuit poor electrical connection
– Faulty starter motor
– Starting system circuit
– Dead (Weak) battery

Tech notes

Sometimes and in some models, low battery voltage or a weak starter can can trigger a Camshaft Position Sensor code.

When is the code detected?

The camshaft position sensor signal is not detected by the Engine Control Module(ECM) during the first few seconds of engine cranking

Symptoms

– Engine Light ON (or Service Engine Soon Warning Light)
– Lack/Loss of Power
– Engine Stall

P0340 Description

The Camshaft Position Sensor is an electronic device used in an engine to record the rate at which the camshaft is spinning. This information is used by the Engine Control Module(ECM) to control ignition and fuel injection. The camshaft position sensor senses the retraction of camshaft (intake) to identify a particular cylinder. The camshaft position sensor senses the piston position. The sensor system consists of a rotating part, typically a disc, as well as a static part, the actual sensor.
When the engine is running, the high and low parts of the teeth cause the gap with the sensor to change. The changing gap causes the magnetic field near the sensor to change. The change in the magnetic field cause the voltage from the sensor to change.
When the crankshaft position sensor (POS) system becomes inoperative, the camshaft position sensor provides various controls of engine parts instead, utilizing timing of cylinder identification signals.

P0340 Information for specific makes

P0340 2002 NISSAN ALTIMA SEDAN
P0340 ACURA
P0340 BMW
P0340 CHRYSLER
P0340 JEEP
P0340 DODGE
P0340 FORD
P0340 HONDA
P0340 HYUNDAI
P0340 NISSAN
P0340 INFINITI
P0340 ISUZU
P0340 KIA
P0340 SCION
P0340 TOYOTA
P0340 BUICK
P0340 LEXUS
P0340 MAZDA
P0340 MITSUBISHI
P0340 SUBARU
P0340 AUDI
P0340 VOLKSWAGEN
P0340 1998 FORD WINDSTAR
P0340 CHEVROLET
P0340 GMC
P0340 PONTIAC
P0340 SATURN
P0340 JAGUAR
P0340 2003 CHEVROLET TRAIL BLAZER
P0340 2003 CHRYSLER NEON
P0340 2003 NISSAN ALTIMA SEDAN
P0340 2003 KIA SEDONA
P0340 2005 NISSAN XTERRA
P0340 2004 NISSAN ALTIMA SEDAN
P0340 2005 NISSAN ALTIMA SEDAN