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P0340 - Camshaft Position Sensor 'A' Circuit Malfunction

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
Possible 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 ACURA Camshaft Position Sensor No Signal
P0340 AUDI Camshaft Position Sensor
P0340 BMW Camshaft Sensor Inlet Signal  P0340 Video
P0340 BUICK Camshaft Position Sensor 'A' Circuit Malfunction
P0340 CHEVROLET Camshaft Position Sensor 'A' Circuit Malfunction  P0340 Video
P0340 CHRYSLER Camshaft Position Sensor Circuit Bank 1 Sensor 1  P0340 Video
P0340 DODGE Camshaft Position Sensor Circuit Bank 1 Sensor 1
P0340 FORD Camshaft Position Sensor Circuit Bank 1 Sensor 1  P0340 Video
P0340 GMC Camshaft Position Sensor 'A' Circuit Malfunction
P0340 HONDA Camshaft Position Sensor 'A' No Signal
P0340 HYUNDAI Camshaft Position Sensor 'A' Circuit Malfunction Bank 1 Or Single Sensor
P0340 INFINITI Camshaft Position Sensor Circuit Bank 1
P0340 ISUZU Camshaft Position Sensor Circuit
P0340 JAGUAR Camshaft Position Sensor Circuit Bank 1 Sensor 1
P0340 JEEP Camshaft Position Sensor Circuit Bank 1 Sensor 1
P0340 KIA Camshaft Position Sensor Circuit Malfunction  P0340 Image
P0340 LEXUS Camshaft Position Sensor 'A' Circuit Bank 1
P0340 MAZDA Camshaft Position Sensor Circuit Malfunction
P0340 MERCEDES-BENZ Camshaft Position Sensor 'A' Circuit Malfunction
P0340 MITSUBISHI Camshaft Position Sensor Circuit
P0340 NISSAN Camshaft Position Sensor Circuit Bank 1  P0340 Video
P0340 PONTIAC Camshaft Position Sensor 'A' Circuit Malfunction
P0340 SATURN Camshaft Position Sensor 'A' Circuit Malfunction  P0340 Video
P0340 SCION Camshaft Position Sensor 'A' Circuit Bank 1
P0340 SUBARU Camshaft Position Sensor 'A' Circuit Signal Fault Bank 1 Or Single Sensor
P0340 TOYOTA Camshaft Position Sensor 'A' Circuit Bank 1
P0340 VOLKSWAGEN Camshaft Position Sensor
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