P0018 - CRANKSHAFT POSITION/CAMSHAFT POSITION, BANK 2 SENSOR 2 -CORRELATION

The Camshaft Position Sensor (CMP) is used to know the position of the camshaft. This information is then sent to the Powertrain Control Module (PCM), which uses it to control the injectors and in some cases, depending on the vehicle model, to measure the ignition time. On the other hand, the Crankshaft Position Sensor (CKP) informs about the position of the crankshaft, in addition to the engine RPM to the PCM. This information is used to control ignition timing and also to control fuel injection.

The crankshaft and camshaft are connected by a belt or timing chain and are thus synchronized. Both the CMP sensor and the CKP work in harmony to give continuous information to the PCM about engine time. If synchronization is not activated, the DTC code P0018 OBDII is set and the Check Engine light is illuminated.

• The MIL light comes on.
• Engine malfunction.
• The engine rotates, but does not start.

The reasons for storing the diagnostic code P0018 OBD2 are:

• Electrical problems in the CMP or CKP sensor circuit.
• Defective CMP or CKP sensor.
• The distribution chain is out of time.
• The cam or crankshaft ring is defective.
• Problems in the VVT system.

To troubleshoot the P0018 OBDII fault code you must do the following:

• Inspect the harness and connectors. Make sure the connections are correct.
• Use an endoscope to check the crankshaft and cam patterns. If a pattern is missing, the corresponding sensor may be defective or a ring may be sliding. Inspect the rings for proper alignment. Also make sure the rings are tight. If installed correctly, replace the sensor.
• Check the timing chain, make sure it is aligned correctly. If it is not aligned, it may be due to a defective tensioner. Repair it or change the chain if it is stretched.