P0343 OBD-II Trouble Code: Camshaft Position Sensor Circuit High Input

Our certified mechanics come to you · 12-month, 12,000-mile warranty

SCHEDULE P0343 DIAGNOSTIC Get a fair and transparent estimate upfront
Red-stars EXCELLENT RATING ON

Cost of diagnosing the P0343 code

P0343 is a diagnostic trouble code (DTC) for "Camshaft Position Sensor Circuit High Input". 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 $70.00. Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $30.00 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$70.00$30.00
Toyota$70.00$30.00
BMW$70.00$30.00
SCHEDULE P0343 DIAGNOSTIC Get a fair and transparent estimate upfront

check engine light

P0343 trouble code definition

A P0343 trouble code is related to a vehicle’s timing system and the camshaft position sensor that monitors the rotation of the camshaft to relay data to the engine computer so it can calculate the appropriate amount of fuel and ignition.

What the P0343 code means

P0343 is an OBD-II generic code for a voltage problem with the camshaft position sensor. This is a fixed electromagnetic sensor that’s connected to a rotating part on the camshaft that records the position of the “teeth” to indicate the stroke of each piston so the computer can apply the appropriate fuel and spark. The position of the camshaft creates various gaps between the sensor which change the magnetic field to change the voltage from the sensor. When a P0343 is present, that voltage is not within the manufacturer’s parameters. It also applies to the bank 1 sensor that monitors cylinder 1.

What causes the P0343 code?

Usually, the camshaft position sensor has been fouled from oil or moisture, causing a bad ground or voltage in the signal wiring. However, other likely causes include:

  • Faulty camshaft position sensor
  • Faulty ground wiring
  • Faulty power wiring
  • Faulty starter motor
  • Weak or dead battery
  • Faulty engine computer

What are the symptoms of the P0343 code?

Because a faulty camshaft position sensor can cause the engine computer to supply the incorrect amount of fuel and or spark, it’s likely that you’ll encounter poor driving conditions with a P0343. It’s typical for the code to result in bucking, surging, stalling or inconsistent starting issues.

How does a mechanic diagnose the P0343 code?

Your mechanic will start with a visual inspection of the sensor to determine if it’s being fouled from an oil leak or frayed/damaged wiring. It is possible to clean a sensor enough for it to work as it should. Electrical contact cleaner or rubbing alcohol can help in cleaning and your mechanic will likely clear the code to see if it returns. If it does, the sensor itself is likely the culprit. This can be tested with a multimeter and a test light to determine if it’s getting the voltage supply it needs. If not, your mechanic will likely replace the sensor with a high-quality replacement part, clear the code and test drive to ensure the new sensor works.

Common mistakes when diagnosing the P0343 code

The most common mistake when dealing with a P0343 circles around bad replacement sensors. It’s important to use high-quality replacement parts and avoid cheaper or used variants. Because some sensors will also be fouled due to oil leaks, it’s recommended to have any near-by leaks repaired so the problem doesn’t persist.

How serious is the P0343 code?

Because the camshaft position sensor is so critical for a modern vehicle’s fuel injection, a P0343 can severely affect the way a vehicle drives. It’s wise to address this code as quickly as you can.

What repairs can fix the P0343 code?

The most common repairs for a P0343 are as follows:

Additional comments for consideration regarding the P0343 code

P0343 codes seem to be prominent with Chevrolet, Kia, Volkswagen and Hyundai models - typically around the model years 2003 to 2005. It’s also not too uncommon for a P0343 code to trigger additional trouble codes as a result.

Need help with a P0343 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
Check Engine Light
P0343

Fast and easy Check Engine Light is on Inspection service at your home or office.

SCHEDULE P0343 DIAGNOSTIC
Get a fair and transparent estimate upfront

Recent Check Engine Light is on Inspection reviews

Excellent Rating


YourMechanic Check Engine Light is on Inspection Service

Average Rating

4.5/5

Number of Reviews

3,484

Rating Summary
3,176
153
40
23
92
3,176
153
40
23
92

Richard

10 years of experience
415 reviews
Richard
10 years of experience
This is the second time I’ve had Richard work on my car. He always does an outstanding job and is quick, knowledgeable and professional. Highly recommended!!
2012 DODGE CHALLENGER - CHECK ENGINE LIGHT IS ON - LAS VEGAS, NEVADA

Michael

13 years of experience
372 reviews
Michael
13 years of experience
Mike was an absolute professional when he arrived. He walked me thru the whole process of my repairs and also made good recommendations for preventive issues. His mechanical knowledge and good customer services was a breath of air and greatly appreciated :-)
2007 CHEVROLET AVALANCHE - CHECK ENGINE LIGHT IS ON INSPECTION - MARIETTA, GEORGIA

Rodrigo

10 years of experience
85 reviews
Rodrigo
10 years of experience
Rodrigo was exactly on time, very professional and friendly. He assessed my car, let me know the exact problem when a previous mechanic from a shop in my area was unable to. I felt he was very honest and sincere letting me know the level of urgency that I deal with the issue. Absolutely no pressure. I will absolutely use Rodrigo the next time I need anything to do with my car and will tell everyone about him. This is such a great service, I will never go to another mechanic again. It is so convenient. I couldn’t be happier. :)
2013 SMART FORTWO - CHECK ENGINE LIGHT IS ON - LAS VEGAS, NEVADA

Ricardo

8 years of experience
223 reviews
Ricardo
8 years of experience
Great service and was very helpful on what maintenance my vehicle needed and what to expect in the future. Would definitely recommend to anyone and will.
2004 MITSUBISHI LANCER - CHECK ENGINE LIGHT IS ON - LOS ANGELES, CALIFORNIA

More related articles

P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
How to Buy Fuel Treatments
Adding a fuel additive to your gas tank when you fill up is one way to clean vital engine parts of deposits, improve the performance of your engine,...
How to Get a Louisiana Driver's Permit
s licensing program. The first step in this program is to obtain...

Related questions

Q: Low oil comes on..trys to stall while accelerating...jerks,etc. Will not start.

Hey there: The problem you're having with your GMC Envoy stalling could be caused by all or one of the components you've mentioned in your question. A dirty fuel filter will restrict the flow of gasoline to the injectors, as...

Q: 2004 Nissan Murano CVT transmission problems

Your Nissan uses what is called a continuously variable transmission (CVT). Instead of using one or more planetary gear sets like a traditional transmission, a CVT uses pulleys and steel belts to provide an infinite number of "gear ratios". Unfortunately,...

Q: Camshaft position sensor error code P0343

Hello. The P0343 code indicates there is no signal from the passenger side cam position sensor (Bank 1 actually). Given you have changed the sensor, this would suggest a wiring or connector issue. Your mileage would also make me anxious...

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.

1-800-701-6230 · hi@yourmechanic.com