P0343
Camshaft Position Sensor "A" Circuit High Input (Bank 1)
The CMP signal voltage is above the upper threshold. Either excessive sensor output or a short to supply voltage.
- Check engine light: Yes
- Emissions related: Yes
- Repair difficulty: medium
Symptoms
- Check engine light on
- Power loss especially in mid-rpm range
- Possible rough idle or stalling
- Increased fuel consumption
Common causes
Ordered by how often each turns out to be the cause.
- Signal wire shorted to supply voltageCommon
- Sensor failedPossible
- Connector pins corroded - high contact resistanceLess likely
Parts involved
- Camshaft Position Sensor
- Camshaft Position Sensor Wiring
P0343 is a generic OBD-II code defined by SAE J2012. Exact wording and diagnostic procedure vary by manufacturer and model. Code definitions are drawn from the public-domain OBDex dataset; the workshop notes are our own.