P0343 Code - Camshaft Position Sensor 'A' Circuit High Input
Quick Answer
The Camshaft Position Sensor is an electronic device used in an engine to record the rate at which the camshaft is spinning. Common causes include Faulty Camshaft Position Sensor, Camshaft Position Sensor harness is open or shorted, Camshaft Position Sensor circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
- What it means
- P0343 indicates Camshaft Position Sensor 'A' Circuit High Input.
- Common causes
- Common causes include Faulty Camshaft Position Sensor, Camshaft Position Sensor harness is open or shorted, Camshaft Position Sensor circuit poor electrical connection.
- Severity
- High - diagnose this code as soon as possible.
- Can I drive?
- Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
Code P0343 Description
When the engine is running, the high and low parts of the teeth cause the gap with the sensor to change. The changing gap causes the magnetic field near the sensor to change. The change in the magnetic field causes the voltage from the sensor to change.
When the crankshaft position sensor (POS) system becomes inoperative, the camshaft position sensor provides various controls of engine parts instead, utilizing the timing of cylinder identification signals.
What are the Possible Causes of the DTC P0343?
- Faulty Camshaft Position Sensor
- Camshaft Position Sensor harness is open or shorted
- Camshaft Position Sensor circuit poor electrical connection
- Faulty starter motor
- Starting system circuit
- Dead (Weak) battery
How to Fix the DTC P0343?
Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.
Code Tech Notes
User Submitted Video
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P0343 code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.
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Information for Specific Makes
- P0343 Buick — Camshaft Position Sensor Circuit High Voltage
- P0343 Cadillac — Camshaft Position Sensor Circuit High Voltage
- P0343 Chevrolet — Camshaft Position Sensor Circuit High Voltage
- P0343 Chrysler — Camshaft Position Sensor Circuit High Input
- P0343 Dodge — Camshaft Position Sensor Circuit High Input
- P0343 Ford — Camshaft Position Sensor 'A' Circuit High Bank 1 or Single Sensor
- P0343 GMC — Camshaft Position Sensor Circuit High Voltage
- P0343 Honda — Camshaft Position Sensor 'A' Circuit
- P0343 Hyundai — Camshaft Position Sensor 'A' Circuit Range/Performance
- P0343 Isuzu — Camshaft Position Sensor Performance
- P0343 Jeep — Camshaft Position Sensor Circuit High Input
- P0343 KIA — Camshaft Position Sensor 'A' Circuit Range/Performance
- P0343 Lexus — Camshaft Position Sensor "A" Circuit High Input
- P0343 Mazda — Eccentric Shaft Position Sensor Circuit Range/Performance
- P0343 Mercedes-Benz — Camshaft Position Sensor 'A' Circuit High Input
- P0343 Pontiac — Camshaft Position Sensor Circuit High Voltage
- P0343 RAM — Camshaft Position Sensor Circuit High Input
- P0343 Saturn — Camshaft Position Sensor Circuit High Voltage
- P0343 Scion — Camshaft Position Sensor "A" Circuit High Input
- P0343 Subaru — Camshaft Position Sensor 'A' Circuit Range/Performance
- P0343 Toyota — Camshaft Position Sensor "A" Circuit High Input
Frequently Asked Questions about P0343 Code
1. What are the common symptoms of OBDII code P0343?
The common symptoms of code P0343 include rough idling, poor acceleration, stalling, and potentially difficulty starting the vehicle.
2. What does the OBDII code P0343 indicate?
Code P0343 indicates a high input signal from the camshaft position sensor 'A' circuit, suggesting a potential issue with the sensor or its wiring.
3. What are the possible causes of OBDII code P0343?
The possible causes of code P0343 include a faulty camshaft position sensor, damaged sensor wiring or connectors, issues with the timing belt or chain, or a problem with the engine control module (ECM).
4. How can I diagnose the cause of OBDII code P0343?
Diagnosing code P0343 typically involves visually inspecting the sensor and its wiring, checking the sensor's signal with a scan tool, and testing the sensor's voltage and ground connections.
5. Can a dirty camshaft position sensor trigger code P0343?
Yes, a dirty or contaminated camshaft position sensor can potentially cause erratic readings and trigger code P0343. Cleaning the sensor may sometimes resolve the issue.
6. Is it safe to drive with OBDII code P0343?
It is generally not recommended to drive with code P0343 as it can lead to further engine problems and potential breakdowns. It is advisable to address the issue promptly.
7. How can I repair OBDII code P0343?
Repairing code P0343 may involve replacing the camshaft position sensor, repairing or replacing damaged wiring or connectors, addressing timing belt or chain issues, or reprogramming the ECM.
8. Can a DIY enthusiast fix OBDII code P0343?
Depending on the level of mechanical expertise, a DIY enthusiast may be able to address code P0343 by following diagnostic procedures, replacing the sensor, or fixing wiring issues. If unsure, seeking professional help is recommended.
9. How long does it take to repair OBDII code P0343?
The repair time for code P0343 can vary depending on the cause of the issue and the complexity of the repair. It may take anywhere from 30 minutes to a few hours to complete the repair.
10. Will resetting the OBDII system clear code P0343?
Resetting the OBDII system may temporarily clear code P0343, but if the underlying issue is not addressed, the code is likely to reappear. It is crucial to diagnose and fix the root cause of the problem.
Discuss the causes and fixes for P0343 OBDII Code
-
2003 Avalanche 1500 5.3, Setting code PO 343, hard to start at times but will start, no misfiring, runs great.( camshaft sensor A bank 1high curcuit input) is what comes with the code reader, I believe it might be a failing cam sensor but am not sure. Can anyone please on this issue? I was also wandering, would this 5.3 have 2 cam sensors, 1 on bank 1 and the other on bank 2? I happen to know it is located at the rear of the intake manifold but can not see it.
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As far as I know there is only one sensor, but you have to remove the intake manifold to access the sensor.
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