P0343 code meaning
Camshaft Position Sensor A Circuit High Bank 1 or Single Sensor
Powertrain system Generic code P03xx codes Check engine light
What P0343 means
P0343 means the signal of the intake camshaft sensor of bank 1 (or the only cam sensor) stays at supply level without edges. Causes are a signal wire shorted to positive, an open signal wire that the module's pull-up holds at 5 V, a broken sensor ground or a faulty sensor. Ford's 2023 diesel sets it when the signal stays at system voltage over 10 or more crank revolutions (3 s). On the Saab 9-4X V6 (GM LAU) the signal must stay high without pulses for more than 1 s, or 10 s cumulatively, and the code follows after two trips. Saab's Motronic 2.8.1 (900 V6) treats low and high together and allows an air gap of at most 1.5 mm. The consequences are as for P0340: longer cranking, cam timing switched off, loss of power.
P0343 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyEasy, DIY possible
- Typical labor0.3 to 2 hours
- Clears after repairAfter a drive cycle
Symptoms of P0343
- Check engine light on
- Longer cranking before the engine starts
- Loss of power (cam timing held in its base position)
- Rough idle, occasionally stalling
Common causes of P0343
- Most likelySignal wire open or shorted to positive
- PossibleSensor ground open
- PossibleCamshaft position sensor faulty
- PossibleConnector corroded
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Camshaft position sensorCamshaft tone wheelSensor wiringEngine control module
What each part of P0343 means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 3 | Area: ignition system or misfire. |
| 43 | The exact fault in that area. |
What to do next
- Note P0343 and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P0343
What does P0343 mean?
P0343 means "Camshaft Position Sensor A Circuit High Bank 1 or Single Sensor". P0343 means the signal of the intake camshaft sensor of bank 1 (or the only cam sensor) stays at supply level without edges. It is a generic code, so it means the same on every make.
Is it safe to drive with P0343?
Drive gently and only to a workshop. With P0343 the car can go into limp mode (reduced power) to protect itself.
Will P0343 fail an emissions test?
Yes, it can. P0343 is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is P0343 to fix?
Difficulty: easy. A typical repair takes 0.3 to 2 hours of work. A careful DIY repair is possible with basic tools and a scanner.
Will P0343 clear itself after the repair?
After the repair the car has to complete a drive cycle (a mix of city and highway driving) before the test runs again. Until then the readiness monitor shows "not ready", which can fail an inspection.