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2003 Infiniti Q35 P0340 Fault: Camshaft Position Sensor Circuit Malfunction - Diagnosis and Fix

Model: 2003 Infiniti F35 Fault Code: P0340 Posted: 2015-05-09 13:37

I own a 2003 Infiniti Q35 and am experiencing a recurring OBD2 fault code P0340, indicating a 'Camshaft Position Sensor Circuit Malfunction'. I replaced both camshaft position sensors and cleared the code, but it returned shortly after. The vehicle starts intermittently and runs poorly under load. I need reliable advice on how to properly diagnose and resolve this issue without unnecessary part replacements. Any insights or troubleshooting steps would be greatly appreciated.

Related fault codes

P0340

Comments (3)

Anonymous 2015-05-09 16:12

A diagnostic code does not always mean a sensor needs replacement. P0340 specifically indicates a 'Camshaft Position Sensor Circuit Malfunction' — the key term here is 'CIRCUIT'. This could point to wiring issues, ground faults, or electrical interference rather than a faulty sensor. Always verify with proper diagnostics before replacing components. Reference: http://www.obd-codes.com/p0340

Anonymous 2016-06-14 10:38

My Infiniti Q35 has difficulty starting but runs smoothly once it's running. The dashboard shows three warning lights: Service Engine, Slip, and VDC Off. This is accompanied by P0340 and a pending code P0340PD. I suspect the issue may be related to sensor signal instability or intermittent electrical connections.

Anonymous 2016-06-14 13:28

Your vehicle shows P0340, with P0340PD indicating a 'pending' code — this means the conditions for setting P0340 are currently present and likely to trigger again. The root cause is not necessarily a failing sensor but could be related to wiring, connector corrosion, or power supply issues. Always check the circuit integrity before replacing parts. Key term: CIRCUIT. Reference: http://www.obd-codes.com/p0340