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


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 for $154.99 . Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $50.0 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 $154.99 $50.0
Toyota $154.99 $50.0
BMW $164.99 $50.0

*Estimates may vary by market

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.

Check Engine Light
trouble codes
P0394

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

SCHEDULE P0394 DIAGNOSTIC
Get a $50 credit for the follow-up repair

Recent Check Engine Light is on Inspection reviews

Excellent Rating

(8600)

Rating Summary
8017
273
65
46
199
8017
273
65
46
199
 at YourMechanic

Brandon

9 years of experience
133 reviews
Brandon
9 years of experience
Ford Escort L4-2.0L - Check Engine Light is on - Nashville, Tennessee
Brandon showed up ahead of schedule, was very personable and diagnosed my problems. He also scheduled my next appointments which will be with him.
 at YourMechanic

William

23 years of experience
33 reviews
William
23 years of experience
Lexus IS250 V6-2.5L - Check Engine Light is on - Mableton, Georgia
Arrived early which was great. William was courteous, and attentive to the issue. Even though it took several attempts I'm so happy he was determined to fix it and he did!
 at YourMechanic

Dan

40 years of experience
1080 reviews
Dan
40 years of experience
Plymouth Grand Voyager - Check Engine Light is on - Lawrenceville, Georgia
Mr. Dan Barber was quite patient, courteous and quite knowledgeable. From my observation, Mr. Barber appears to be quite professional.
 at YourMechanic

Christopher

9 years of experience
120 reviews
Christopher
9 years of experience
Ford Fiesta L4-1.6L - Check Engine Light is on - Smyrna, Georgia
Chris communicated with us each step of the way up until his arrival. He listened well, was knowledgeable, and was prepared. He took the time to diagnose the problem, explained the what, why and how and provided a solution. I would definitely recommend him and will use him again.


More related articles

P2192 OBD-II Trouble Code: System Too Rich at Higher Load Bank 1
P2192 P2192 code definition System Too Rich at Higher Load Bank 1 What the P2192 code means This code indicates there is a rich condition in the exhaust under high load conditions. High load conditions exist when a vehicle is...
P0250 OBD-II Trouble Code: Turbocharger Wastegate Solenoid B Circuit High
P0250 P0250 code definition Turbocharger Wastegate Solenoid B Circuit High What the P0250 code means P0250 is an OBD-II generic code that the engine control module (ECM) detected the Turbocharger Wastegate Solenoid B input circuit high above specifications indicating a...
P0528 OBD-II Trouble Code: Fan Speed Sensor Circuit Malfunction
P0528 P0528 code definition The P0528 code is the universal fault for fan speed sensor circuit no signal. This fault may be accompanied by other cooling system codes, such as P0480, or P0483. What the P0528 code means P0528 is...

Related questions

Check Engine Light; Code P1449
Hello. Code P1449 is for the hybrid battery overheating. Honda has issued a TSB 04-028 for this issue. You will have to take your car to the dealer, since the high voltage battery must be accessed for repair. Honda has...
Hard throttle bucking
If the split seal on the air intake is after the MAF (Mass Airflow Sensor), it will cause this problem. When you give the motor a lot of throttle, a much larger amount begins to flow into the motor. This...
Codes P0016 and P000b
Hi there. The P0016 code (https://www.yourmechanic.com/article/p0016-obd-ii-trouble-code-camshaft-position-a-camshaft-position-correlation-bank-1-by-jay-safford) is a camshaft/crankshaft correlation bank(1) issue. The P000b is camshaft position slow response bank(1) issue. These codes together are an indication that camshaft timing is out of sync with the crankshaft. This problem has...

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 (844) 997-3624 · hi@yourmechanic.com