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

Our certified mechanics come to you · 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. 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 P0343 DIAGNOSTIC Get a fair and transparent estimate upfront

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
P0343
Check Engine Light

No more waiting rooms! Our mechanics will come to you to diagnose and fix the P0343 code.

SCHEDULE P0343 DIAGNOSTIC
Get a $20 credit for the follow-up repair

Recent Check Engine Light is on Inspection reviews

Excellent Rating


YourMechanic Check Engine Light is on Inspection Service

Average Rating

4.8/5

Number of Reviews

5,606

Rating Summary
5,180
205
50
34
137
5,180
205
50
34
137

James

40 years of experience
34 reviews
James
40 years of experience
Ford F-150 - Check Engine Light is on - Chagrin Falls, Ohio
Jim was great! Arrived on time, quickly diagnosed the problem and recommended further work. Very helpful, I’ll use Jim again and recommend to family and friends.

Roberto

11 years of experience
137 reviews
Roberto
11 years of experience
Nissan Titan - Check Engine Light is on - Spring, Texas
Roberto was very thorough with his explanation of repairs needed. I will contact your mechanic for future repairs.

Matthew

32 years of experience
839 reviews
Matthew
32 years of experience
Kia Optima - Check Engine Light is on - Yorktown, Virginia
Matthew Lerman was God Sent, and thank God for Your Mechanic,, you have my Vote Looking , Looking forward for more Business. Very Honest Guy

Robert

20 years of experience
38 reviews
Robert
20 years of experience
Honda Accord - Check Engine Light is on - Brentwood, California
He came earlier than on time and got the job done faster than I seen anyone else have . Solid honest hard working dude.


Related questions

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...

More related articles

B1888 OBD-II Trouble Code: Air Bag Passenger Circuit Resistance Low or Shorted Together
B1888 means there is a malfunction in the passenger airbag circuit, likely due to a short circuit or defective clockspring.
P0160 OBD-II Trouble Code: 02 Sensor Circuit No Activity Detected (Bank 2 Sensor 2)
P0160 P0160 code definition Trouble code P0160 is set when no activity is detected on the bank 2 sensor 2 oxygen sensor circuit. Bank 2 refers to the side of the engine opposite of cylinder number one. Sensor 2 means...
P0677 OBD-II Trouble Code: Cylinder 7 Glow Plug Circuit
P0677 means that there is an issue with the glow plug circuit due to faulty relays, timer, module, or electrical components.

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