P0393 OBD-II Trouble Code: Camshaft Position Sensor "B" Circuit High (Bank 2)

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

Red-stars EXCELLENT RATING ON

Cost of diagnosing the P0393 code

P0393 is a diagnostic trouble code (DTC) for "Camshaft Position Sensor "B" Circuit High (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 P0393 DIAGNOSTIC Get a fair and transparent estimate upfront

P0393 code definition

The P0393 code is stored when the PCM detects an abnormally high voltage reading from the camshaft position sensor circuit for camshaft sensor B in engine bank 2. This code may be stored with crankshaft sensor codes.

What the P0393 code means

The PCM monitors the camshaft position to ensure that the engine is running at optimal levels. If the PCM detects a voltage reading from engine bank 2’s camshaft position sensor B circuit, which is more than 10% higher than the manufacturer’s specifications, the P0393 code will be stored.

What causes the P0393 code?

The most common cause of the P0393 code is damaged electrical components, such as wiring, due to leaking oil or other engine fluid. Other causes may include:

  • Contaminated engine fluid
  • Bad camshaft sensors
  • Bad crankshaft sensors
  • Faulty starter motor
  • Weak battery
  • Faulty starting system circuit

What are the symptoms of the P0393 code?

Some vehicle owners may only notice the illumination of the Check Engine Light. However, others may experience symptoms such as a total loss of power, a stalled engine, choppy acceleration, or rough idling.

How does a mechanic diagnose the P0393 code?

After verifying the P0393 code with an OBD-II scanner, the mechanic should begin by looking for leaking fluid that could have caused shorts or corrosion within the electrical components. Any issues should be repaired, and the code should be cleared from the system. If the code reappears after a retest, the mechanic should then perform voltage tests on the sensor, manually comparing the information to the manufacturer’s specifications.

If the readings are within the correct limits, then the sensor needs to be replaced. However, if the readings are not within the correct limits, the mechanic should continue checking each possible cause, clearing the code and retesting the system after each attempt, to be sure that the correct solution is found.

Common mistakes when diagnosing the P0393 code

In most cases, a misdiagnosis comes in the form of a replaced sensor. It is important to diagnose every possible component, particularly the electrical components, before replacing any major part.

How serious is the P0393 code?

Without the PCM’s ability to properly control the position of the camshaft, the vehicle will experience larger problems. It is very important to address the cause of the P0393 code right away, before more damage occurs.

What repairs can fix the P0393 code?

In order to repair the P0393 code, a mechanic may attempt any of the following:

Additional comments for consideration regarding the P0393 code

If either the camshaft or the crankshaft sensors are faulty in the case of the P0393 code, it is best to replace both units at the same time. Most manufacturers report that these two components work best when the wear is identical.

Need help with a P0393 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
P0393

No more waiting rooms! Our mechanics will come to you to diagnose and fix the P0393 code.

SCHEDULE P0393 DIAGNOSTIC
Get a $20 credit for the follow-up repair

Recent Check Engine Light is on Inspection reviews

Excellent Rating

(6,328)

Rating Summary
5,857
225
52
35
159
5,857
225
52
35
159

Gustavo

17 years of experience
296 reviews
Gustavo
17 years of experience
Toyota Corolla - Check Engine Light is on - New Braunfels, Texas
As always, punctual and professional. He explains the problem thoroughly. I feel confident in his work and knowledge.

Greg

22 years of experience
86 reviews
Greg
22 years of experience
Mazda 3 - Check Engine Light is on - Queen Creek, Arizona
Greg was scheduled for 1:00 but he was able to come earlier and let us know right away. He was very thorough and spent his time going thru the entire car.

Gustavo

17 years of experience
296 reviews
Gustavo
17 years of experience
Lincoln Aviator - Check Engine Light is on - San Antonio, Texas
Made call before appt. -courteous-knowledgeable-got part need & did prompt repair after computer check.

Claud

8 years of experience
325 reviews
Claud
8 years of experience
Chevrolet Trax - Check Engine Light is on - Grosse Pointe, Michigan
Very good experience. He arrived on time. Explained what he was going to do. Completed the work and was thorough in what I needed for my next service in plain language vs car jargon. I'm a raving fan of Claud!


More related articles

P2031 OBD-II Trouble Code: Exhaust Gas Temperature (EGT) Sensor Circuit Bank 1 Sensor 2
P2031 P2031 code definition Exhaust Gas Temperature (EGT) Sensor Circuit Bank 1 Sensor 2 What the P2031 code means P2031 is an OBD-II generic code for when the Engine Control Module (ECM) detects that, during the exhaust gas temperature (EGT)...
P0236 OBD-II Trouble Code: Turbocharger Boost Sensor A Circuit Range/Performance
P0236 code definition Turbocharger Boost Sensor A Circuit Range/Performance What the P0236 code means P0236 is an OBD-II generic code that is...
P2291 OBD-II Trouble Code: Injector Control Pressure Too Low - Engine Cranking
P2291 Code Definition Injector Control Pressure Too Low - Engine Cranking What the P2291 code means This trouble code will only be...

Related questions

Step by step troubleshooting of DTC fault codes

Each of these codes are for different components and since you swapped the motor with a different size motor than what the car had may be a big problem. You would need to have each code diagnosed separately to see...

Does a chevy colbat have 2 knock sensors?

You only have one sensor on this engine. If the P0327 trouble code continues then have the engine checked to see if you have an engine knock or the fuel you are using is below 87 octane, causing the engine...

Sputtering, loss of power, and check engine light came on.

Hi there. Check to see what type of fuel you got for your vehicle. The LS 460 is required to have a minimum of 91 octane. If the octane was less than 91 or really high of 95 to 99,...

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