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P0340 is a diagnostic trouble code (DTC) for "Camshaft Position Sensor Circuit Malfunction". This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation. Our certified mobile mechanics can come to your home or office to perform the Check Engine Light diagnostic for $70.00. Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $30.00 off as a credit towards the repair. All our repairs are backed by our 12-month / 12,000-mile warranty.
Camshaft Position Sensor Circuit Malfunction
The camshaft position sensor calculates the rotational speed of the camshaft and where the camshaft is positioned in that rotation. The camshaft sensor sends a signal to the Power Control Module (PCM) to communicate this information. The PCM then uses the information collected by the camshaft position sensor to set the fuel injector timing and control the ignition spark.
When the signal to and from the camshaft position sensor and the PCM is broken, the ignition spark and fuel injector timing will fail and the PCM will store the P0340. This will trigger the illumination of the Check Engine Light.
Uses an OBD-II scanner to retrieve all of the trouble codes that have been stored by the PCM
Inspects the camshaft position sensor wiring for wires that are broken, corroded, or shorted
Inspects the camshaft position sensor connector for connectors that have broken or corroded
Inspects the camshaft position sensor circuit wiring for wires that are broken, corroded, or shorted
Checks the continuity of the camshaft position sensor circuitry
Completes any necessary repairs for other related trouble codes that have been stored by the PCM
Uses a scan tool or oscilloscope to check the camshaft position sensor voltage readings
If the voltage readings are abnormal, the camshaft position sensor will need to be replaced.
If the voltage readings for the camshaft position sensor voltage readings are normal, it is possible that there is a problem with the PCM which may require replacing or reprogramming.
Before replacing the camshaft position sensor, it is important to inspect the wiring and connectors to rule them out as the cause of the problem. This is the most common mistake when diagnosing the P0340 trouble code.
Another mistake that is made during the diagnostic procedure is neglecting to consider a misfiring problem or a crankshaft sensor problem as possible sources of the P0340 trouble code.
This code is considered serious. The car may not start or be difficult to start. While operating the vehicle, the driver may also experience a lack of power. These symptoms make the operation of the vehicle dangerous for the driver and anyone else on the road. It is also possible for damage to be caused to other components in the engine if the P0340 trouble code goes unaddressed for an extended period of time. The P0340 trouble code should be diagnosed and repaired immediately.
The P0340 trouble code is not always easy to diagnose. Be sure to check the system in its entirety before making any determinations. Also be sure that you are repairing and/or replacing the right component.
YourMechanic offers certified mechanics who will come to your home or office to diagnose and repair your vehicle. Get a quote and book an appointment online or speak to a service advisor at 1-800-701-6230.