P0018 HUMMER - Crankshaft Position - Camshaft Position Correlation Bank 2 Sensor 'A'
- Mechanical timing fault
- Blocked oil passage
- Low oil level
- Faulty Intake ('A') Camshaft Position (CMP) Sensor
- Faulty Crankshaft Position (CKP) Sensor
When is the code detected?
- Engine Light ON (or Service Engine Soon Warning Light)
- Engine hard to start
- Engine stall while driving
P0018 HUMMER Description
The Camshaft Position (CMP) sensor is triggered by a notched reluctor wheel built into the exhaust camshaft sprocket. The CMP sensor provides 6 signal pulses every camshaft revolution. Each notch, or feature of the reluctor wheel is of a different size for individual cylinder identification. This means the CMP and crankshaft position (CKP) signals are pulse width encoded to enable the PCM to constantly monitor their relationship. This relationship is used to determine camshaft actuator position and control its phasing at the correct value. The PCM also uses this signal to identify the compression stroke of each cylinder, and for sequential fuel injection. The CMP sensor is connected to the PCM by a 12-volt, low reference, and signal circuit.
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