P0394 OBD-II Trouble Code: Camshaft Position Sensor "B" Circuit Intermittent (Bank 2)

Our certified mechanics come to you · Get a fair and transparent estimate upfront

Red-stars EXCELLENT RATING ON

Cost of diagnosing the P0394 code

P0394 is a diagnostic trouble code (DTC) for "Camshaft Position Sensor "B" Circuit Intermittent (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.

Cars Estimate Credit towards follow-up repair Earliest Availability
Ford$20.00
Toyota$20.00
BMW$20.00
SCHEDULE P0394 DIAGNOSTIC Get a fair and transparent estimate upfront

P0394 code definition

When an OBD-II scanner detects the P0394 code, it indicates that the PCM has detected an intermittently incorrect voltage reading from the camshaft sensor circuit B in engine bank 2.

What the P0394 code means

In order for the engine control module, or ECM, to control the fuel injection and ignition within the engine, it requires data regarding the rate at which the camshaft is spinning. This data is provided by the camshaft position sensor, which reads the change in the magnetic field of the camshaft operation and translates that information into voltage. If the voltage does not match what the manufacturer’s specifications say that it should be for the current circumstances, the PCM will assume that there is an issue with the sensor and store the P0394 code.

What causes the P0394 code?

The camshaft and sensor are both made up of multiple parts that could create an issue for the voltage reading. Therefore, the root cause of the P0394 could be any of the following:

  • Faulty camshaft position sensor
  • Leaking oil or engine fluids
  • Open or shorted camshaft position sensor
  • Poor electrical connection in the camshaft position sensor circuit
  • Dead or weakened battery
  • Faulty starting system circuit
  • Faulty starter motor
  • Shorted, grounded, loose, or faulty electrical components such as wiring and connectors
  • PCM failure, in rare cases

What are the symptoms of the P0394 code?

The symptoms of the P0394 code may include a rough idle, difficulty accelerating, difficulty starting the engine, total engine stall, and the illumination of the Check Engine light.

How does a mechanic diagnose the P0394 code?

Once the P0394 code has been verified with the scanner, the technician should perform a visual inspection of all the wiring, connectors, and other electrical components. If any damaged elements appear, they should be replaced, reconnected, or repaired as necessary. The mechanic should then clear the P0394 code from the PCM memory, and retest the system. If the code returns, they will then move on to other repairs to address issues within the camshaft position sensor.

Common mistakes when diagnosing the P0394 code

Most often, technicians will assume that the issue lies with a faulty sensor, and replace the part without performing a thorough diagnosis on the entire system. OEM sensor components don’t fail as frequently as other issues, and the code pertains to the entire circuit, which could indicate a fault at many other specific parts.

How serious is the P0394 code?

If the P0394 code is being detected, it indicates a very serious issue that should be addressed right away. The problem relates directly to how well the ignition and fuel injection functions operate, and can have significant effect on the vehicle overall.

What repairs can fix the P0394 code?

In order to repair the cause of the P0394, there are many things that a mechanic should do in order to properly diagnose and address the issue. These steps may include:

After each possible repair is performed, it is important to clear the code from the PCM and retest the system, to confirm that the fix did or did not address the issue.

Additional comments for consideration regarding the P0394 code

Manufacturers recommend replacing crankshaft components at the same time that any camshaft components are replaced. These components work as a team, and perform better when they have similar amounts of wear.

Need help with a P0394 code?

YourMechanic offers certified mobile mechanics who will come to your home or office to diagnose and repair your vehicle. Get a quote and book an appointment online or speak to a service advisor at 1-800-701-6230.

trouble codes
P0394
Check Engine Light

No more waiting rooms! Our mechanics will come to you to diagnose and fix the P0394 code.

SCHEDULE P0394 DIAGNOSTIC
Get a $20 credit for the follow-up repair

Recent Check Engine Light is on Inspection reviews

Excellent Rating

(6,144)

Rating Summary
5,685
221
51
35
152
5,685
221
51
35
152

Chris

11 years of experience
13 reviews
Chris
11 years of experience
Ford F-150 - Check Engine Light is on - North Salt Lake, Utah
We were having problems with our check engine light, and Chris was exceptionally thorough until he found the problem and could help resolve the situation. We appreciate having someone who cares enough to get the job done right, not just done. We will definitely use Chris' services in the future. Thanks Chris.

Leng

21 years of experience
2 reviews
Leng
21 years of experience
Mazda MPV - Check Engine Light is on - Seattle, Washington
Leng arrived on time and explained the issue that my van is having. I will make a follow up appointment for the fix. Friendly, easy to talk to, and professional - thank you very much!

Okela

13 years of experience
11 reviews
Okela
13 years of experience
Land Rover LR4 - Check Engine Light is on - Brooklyn, New York
Okela was incredible! He is super thorough and took time to walk us through the issues with our LR4. Couldn’t recommend more! Thank you Okela!!

Robert

37 years of experience
188 reviews
Robert
37 years of experience
Land Rover LR2 - Check Engine Light is on - Atlanta, Georgia
Robert arrived on time. Did a diagnostic check quickly. He was friendly, and gave great service. He knows how to work on a Land Rover.


More related articles

P0353 OBD-II Trouble Code: Ignition Coil C Primary/Secondary Circuit Malfunction
P0353 means a malfunction has been found specifically in ignition coil C. Problems may include broken connector locks and loose connection at coil.
How Do I Look Up What Different Codes Mean?
You’re You’re driving your car and everything is going fine when, suddenly, the Check Engine Light comes on. You head home and get out your trusty code reader. You connect it to the OBD II connection under the dash, and...
P0873 OBD-II Trouble Code: Transmission Fluid Pressure Sensor/Switch C Circuit High
P0873 means the transmission fluid pressure level is abnormal due to Dirty, contaminated or burnt transmission fluid, or a faulty transmission system.

Related questions

My car has high miles and tonight it began "missing" and the engine does not seem as "smooth" as usual.

Hello. The symptoms you describe can be caused by a wide variety of issues. If the Check Engine Light has come on, then I would recommend retrieving the trouble codes as the possibilities could be many. Issues with the fuel...

Which sensors are most important for monitoring and improving the engine’s performance?

The way modern electronic engine control systems are designed, all of the sensors are important but some are more crucial to the vehicle than others. For example, if the engine electronic control unit (ECU) loses the input from the coolant...

7 codes transmission shifting bad could it b ecm

Having that many codes that go to one component may want you to quickly condemn the ECM. However, the vehicle should not have the ECM replaced until one or more of the codes retrieved calls for the replacement of the...

How can we help?

Our service team is available 7 days a week, Monday - Friday from 6 AM to 5 PM PST, Saturday - Sunday 7 AM - 4 PM PST.

1 (855) 347-2779 · hi@yourmechanic.com