Camshaft Position Sensor A Circuit Malfunction
Your engine computer cannot correctly read the camshaft position sensor on bank 1, or the only cam sensor on the engine. This can cause hard starting, rough running, stalling, or a no-start condition. The problem may be the sensor, its wiring, connector, timing issue, or sometimes the crankshaft sensor.
If the engine starts and runs, drive only short distances because stalling, poor performance, or a no-start can happen without warning. If the engine is hard to start, runs very poorly, or stalls, do not continue driving until it is diagnosed.
P0340 sets when the powertrain control module detects an invalid, missing, or out-of-range signal from the camshaft position sensor A circuit on bank 1 or the single sensor used by the engine. The PCM uses this signal along with the crankshaft position sensor to determine valve timing, injector timing, and ignition synchronization. A fault can be caused by the sensor itself, the wiring or connector, low reference voltage, poor ground, or mechanical timing problems.
Yes. On many engines, a failed camshaft position sensor or its circuit can prevent the engine from starting or cause a very long crank time.
Sometimes that fixes it, but not always. Wiring problems, timing chain issues, connector damage, or a bad crankshaft sensor can also trigger P0340.
Yes. The engine may stall, run poorly, or fail to start, so it should be diagnosed soon.
Bank 1 is the side of a V-type engine with cylinder 1. On inline engines, the code usually refers to the engine's only camshaft position sensor circuit or the primary cam sensor.
It can, especially during cranking. Low voltage can weaken or distort the sensor signal and cause the PCM to lose synchronization.