The powertrain control module (PCM) needs information about the camshaft’s position to determine ignition timing and fuel injector synchronization. The camshaft position (CMP) sensor is responsible for collecting this information for the PCM. If your vehicle’s having problems, you can use a scan tool to see if there’s a diagnostic trouble code (DTC) that has been triggered. If the P0348 code is stored, then there’s a chance that there’s an issue with the CMP sensor.
DTC P0348 stands for Camshaft Position Sensor “A” Circuit High Bank 2. This code triggers when the signal coming from the CMP sensor located in bank #1 is either missing or inconsistent.
The CMP sensor measures the speed and position of the engine’s camshaft. Vehicles with a dual overhead camshaft engine can have more than one camshaft so there’s often a CMP sensor for each camshaft in the engine. Each CMP sensor reads a wheel or plate located at the end of the corresponding camshaft that passes over the sensor.
The PCM also uses the CMP sensor to verify if the signals sent by the crankshaft position (CKP) sensor are correct.
The PCM needs information about the camshaft because it’s the main component responsible for opening and closing the engine’s valves that let air in or out of the combustion chamber. Problems with the CMP sensor can lead to major drivability issues.
Note: The definition of code P0348 might be different depending on the vehicle manufacturer. Consult the appropriate repair manual or repair database for the exact code definition.
Diagnosing a P0348 usually involves inspecting the CMP sensor and its wiring and connectors. The process can have various additional steps, depending on the vehicle’s year, make, and model. If you aren’t familiar with your vehicle, it might be best to have a certified mechanic do the job for you.
But if you want to take a shot at it, take a look at the video below to learn more about the diagnostic process.
There isn’t a magic bullet for any DTC. Troubleshooting steps will vary depending on the vehicle manufacturer because the camshaft sensors and their wiring can vary. Under these circumstances, bringing your vehicle to a trained professional might be your best bet to resolve the issue.
Before you work on your vehicle, make sure to have the right technical information. Luckily, this information is available online. Chilton guides or an ALLDATA subscription contain vehicle-specific repair information, so you might want to check those out before you begin.
Any information provided on this Website is for informational purposes only and is not intended to replace consultation with a professional mechanic. The accuracy and timeliness of the information may change from the time of publication.