Camshaft Position Sensor 'A' Circuit High
The camshaft position sensor signal is too high.
Heads up: this code wasn't in our hand-written library yet, so DiagCoach AI built this page on the fly. Double-check critical specs against service info before condemning parts.
What it means (plain English)
The camshaft position sensor measures the position of the camshaft. A high voltage reading indicates the sensor thinks the camshaft is in an unexpected position, which can throw off engine timing.
What the computer is actually seeing
The PCM receives a camshaft position signal within a specified voltage range. For P0343, it's detecting a signal above the threshold, which is usually over 5 volts.
What a healthy reading looks like
Camshaft position sensor voltage should typically range from 0.5 to 4.5 volts; anything higher is problematic.
Guided diagnostic — the DiagCoach way
Don't just throw parts at it. Walk through these in order — each step tells you whether to keep going or stop and fix what you found.
- 11. Check the wiring and connector to the camshaft position sensor for any visible damage or corrosion. If damaged, repair or replace.
- 22. Using a multimeter, measure the voltage across the sensor connector while the engine is running. If the voltage exceeds 4.5 volts, replace the sensor.
- 33. Inspect the wiring between the camshaft position sensor and the PCM for any shorts or incorrect connections. Repair as needed.
- 44. If all checks are good but the code persists, consider testing/replacing the PCM.
Common causes
- Faulty camshaft position sensor
- Short in wiring harness
- Poor connector contact
- Faulty engine control module (ECM)
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's moderate severity; drivability might be affected, so fix it soon to avoid further issues.
Will this code come back after I clear it?
If the underlying issue isn't fixed, yes, the code will likely return.
Why does this code sometimes pair with P0340?
P0340 indicates a circuit malfunction in the camshaft position sensor, while P0343 signals high voltage; both relate to the sensor functionality.
Working a real vehicle right now?
Let DiagCoach walk you through it live with your specific symptoms, vehicle, and what you've already checked.
Start guided diagnostic →