P0343Camshaft Position Sensor A Circuit High Bank 1 or Single Sensor
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- Needs a drive cycle to confirm a fix
- How the car detects it
- 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.
- What you may notice
- Check engine light on
- Longer cranking before the engine starts
- Loss of power (cam timing held in its base position)
- Rough idle, occasionally stalling
- Likely causes
- LikelySignal wire open or shorted to positive
- PossibleSensor ground open
- PossibleCamshaft position sensor faulty
- PossibleConnector corroded
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Easy · Often possible to do yourself.Typical cost: €30 – €300
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.