P0340 Nissan Altima
Camshaft Position Sensor Circuit Malfunction (Bank 1) · Powertrain Code · High · Repair: Moderate
What is P0340?
The camshaft position sensor on bank 1 is not providing a valid signal. Engine may not start or run poorly.
When the Nissan Altima triggers code P0340 (camshaft position sensor circuit malfunction (bank 1)), it typically points to an issue in the powertrain system. This is a high severity code, so address it promptly to avoid further damage or safety concerns. Below you'll find the most common causes, symptoms, and repair options specific to the Nissan Altima.
This repair is rated moderate, meaning some experience and specialty tools required.
Diagnostic data on this page is compiled from publicly available repair resources and technical service bulletins. Always have a qualified mechanic confirm the diagnosis before authorizing repairs on your Nissan Altima.
Common Causes on Nissan Altima
- Failed camshaft position sensor (CMP)
- CMP sensor wiring open or shorted
- Timing chain jumped causing incorrect cam signal
- Oil contamination on CMP sensor from valve cover gasket leak
Symptoms
- Check Engine Light on
- Hard starting or extended cranking
- Rough idle
- Possible stalling
- Reduced power
Notes for Nissan Altima
On VQ35 engines, there are multiple CMP sensors (one per bank); identify the correct bank before replacing.