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P0392 is a diagnostic trouble code (DTC) for "Camshaft Position Sensor "B" Circuit Low (Bank 2)". This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation. Our certified mobile mechanics can come to your home or office to perform the Check Engine Light diagnostic. Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $20.00 off as a credit towards the repair. All our repairs are backed by our 12-month / 12,000-mile warranty.
A P0392 code identifies incorrect voltage or waveform from the camshaft position sensor circuit. It is specifically for the camshaft sensor "B" in engine bank 2.
P0392 is an OBD-II generic code that occurs if the powertrain control module perceives an incorrect camshaft position. The camshaft position sensor is a fixed part that uses an electromagnetic field along with the notches of the camshaft to deliver data about camshaft position to the PCM. This, in turn, allows the module to properly calculate ignition timing and fuel delivery. The code is generated when the voltage exceeds 10% of the manufacturer's value.
Typically, the P0392 code is due to:
The P0392 code is usually accompanied by such symptoms as delays in engine start, very rough idling of the engine, sluggish or unreliable acceleration, poor engine performance and even a vehicle with a no-start situation. The service engine light may also illuminate.
The P0392 code is diagnosed with the OBD-II scanner, and then a visual inspection of all wiring is performed. Any needed repairs or replacements must be done before clearing the codes and retesting. If the code reappears, the mechanic will have to monitor waveforms and look for inconsistence in the performance of the camshaft, distributor and crankshaft sensors. They will also look for signs of fluid leaks and perform voltage testing on the sensors. This means that repairs require the scanner, an oscilloscope, and a digital ohm meter.
Many technicians blame the sensor for triggering the code without first testing the entire system. There are many areas where failure may occur and because the code covers the entire circuit for the camshaft position sensor, a thorough diagnosis is needed. The camshaft position sensor interacts with the reluctor ring at the end of the camshaft, and when it passes the sensor it interrupts the pattern from the sensor to the PCM. This is something that has to match the pre-programmed timing in the PCM and so it is important that you diagnose the cause carefully.
When a vehicle records the P0392 code, it is at risk for a no-start condition. The camshaft is perceived by the PCM as being in the wrong location, and it will cause a chain reaction of unpredictable behaviors. Though it may mean nothing more than a lack of engine performance, it is an issue that must be repaired immediately. It may be due to leaked or leaking fluids, and this is a problem that will only worsen and cause further degradation of parts.
Standard repair steps for the P0392 code will include:
The failure of a PCM is a very rare event and should be the mechanic's last issue to test if all other steps reveal no problems or inconsistencies.
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