The 2021 Ram ProMaster City can experience stalling at stops, which is particularly problematic for commercial delivery operations. Code P0340 points to camshaft position sensor circuit issues that can cause this symptom.
Stalling Causes
Stalling at stops can result from multiple causes, though P0340 indicates the camshaft position sensor circuit is involved in this case.
Camshaft Position Sensor Issues
Sensor Failure
The camshaft position sensor tells the ECU crankshaft-to-camshaft timing. Sensor failure can cause stalling, no-start, or rough running.
Wiring Problems
Damaged wiring or connectors to the sensor cause intermittent signal loss, triggering P0340 and potential stalling.
Sensor Gap Issues
Incorrect air gap between sensor and reluctor wheel affects signal quality.
Other Stalling Causes
Idle Air Control
Even with a cam sensor code, idle control issues may contribute to stalling. The engine may run poorly enough to stall at idle.
Fuel Delivery
Insufficient fuel at idle combined with cam sensor issues can cause stalling.