What does it mean?
This is a generic powertrain diagnostic trouble code (DTC), meaning it covers all makes/models from 1996 onward. However, specific troubleshooting steps vary by vehicle.
Automotive trouble code P0392 is one of several generic malfunction codes related to the camshaft position sensor (CPS). Fault codes P0390 through P0394 are all generic CPS-related codes indicating different failure reasons.
In this case, code P0392 indicates the sensor signal is too weak or not strong enough. The signal is sufficiently weak to be vague and difficult to interpret. P0392 refers to Bank 2 sensor “B”. Bank 2 is the engine side that does not contain cylinder #1.
Description and correlation of crankshaft and camshaft position sensors
In today’s vehicles, it’s important to understand what these sensors are and how they interact. All distributorless ignition vehicles use crank and cam sensors to replace the module and trigger wheel found in an electronic distributor.
The crankshaft position sensor (CPS) signals the engine control module the piston locations relative to top dead center for fuel injection and spark plug firing.
The camshaft position sensor (CMP) signals the intake camshaft lobe position relative to the CPS signal and the intake valve opening for fuel injection on each cylinder.
Description and location of sensors
Crank and cam sensors provide an “on/off” signal. Both are either Hall effect or magnetic.
A Hall effect sensor uses an electromagnetic sensor and a reluctor. The reluctor is shaped like small cups with squares cut out on the sides, making it resemble a fence. The reluctor rotates while the sensor is stationary and mounted very close to the reluctor. Whenever a tooth passes the sensor, a signal is produced, and when the tooth passes, the signal turns off.
A magnetic sensor uses a fixed sensor and a magnet attached to the rotating part. Whenever the magnet passes the sensor, a signal is produced.
Locations
A Hall effect crank sensor is located on the harmonic balancer at the front of the engine. The magnetic sensor may be located on the side of the engine block where it uses the center of the crankshaft for a signal, or it may be in the bell housing where it uses the flywheel as a trigger.
The camshaft sensor mounts at the front or rear of the camshaft.
Symptoms
Symptoms may include:
Check Engine Light illuminated (malfunction indicator lamp) with P0392 code set
Lack of power
Stumbling
Hard starting
Potential Causes
Causes
of this DTC may include:
Faulty “B” camshaft position sensor
Sensor harness open or shorted
Poor electrical connections
Faulty starter
Bad wiring to starter
Poor battery
Diagnostic and Repair Procedures
Check Technical Service Bulletins (TSBs) for anything related to this code. TSBs are a list of complaints and failures handled at the dealership level and the recommended fixes from manufacturers.
Check battery condition. A weak battery can cause the code to set.
Check all starter wiring. Look for corrosion, loose connections, or frayed insulation.
Check connector on camshaft sensor. Look for corrosion and bent pins. Apply dielectric grease to pins.
Check starter for excessive draw indicating a weak starter.
Replace “B” camshaft position sensor on bank 2
Example photo of a camshaft position sensor (CMP):
Related camshaft fault codes: P0340, P0341, P0342, P0343, P0345, P0346, P0347, P0348, P0349, P0365, P0366, P0367, P0368, P0369, P0390, P0391, P0393, P0394.