Can it be the timing chain or is it pcm
This diagnostic trouble code (DTC) is generic and applies to all makes & models of vehicles. The crankshaft position sensor (CKP) and Camshaft position sensor (CMP) work in harmony to control the spark/fuel delivery and timing. They both consist of a reluctor, or tone, ring which passes over a magnetic sensor, which generates a voltage, indicating position.
The crankshaft sensor is part of the primary ignition system and functions as the "trigger". It detects the position of the crankshaft relays that information on to the PCM or the ignition module (depending on the vehicle) to control spark timing. The Camshaft position sensor detects the position of the camshafts and relays the information to the PCM. The PCM uses the CMP signal to identify the beginning of the injector sequence. What ties these two shafts and their sensors together is the timing belt or chain. The cam and crank should be precisely timed together.
If the PCM detects that the crank and cam signals are out of time by a specific number of degrees, this DTC will set. Bank 2 is the side of the engine that doesn't contains cylinder #1, the "A" sensor is most likely the intake camshaft side.
Note it is not uncommon on certain models to see this DTC in conjuction with P0008, P0009, P0016, P0017, and P0019. If you have a GM vehicle and have those multiple DTCs, check for service bulletins that may apply to your engine.
Symptoms
Symptoms of a P0018 will or may include:
Causes may include:
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