P0342
Camshaft Position Sensor A Circuit Low Bank 1 or Single Sensor
Ignition / engine timing
Generic OBD-II
High
What it means
P0342 means the ECM sees a lower-than-expected voltage from the bank 1 camshaft position sensor. That sensor tells the computer where the camshaft is so it can time fuel and spark, so a fault here can cause hard starting, stalling, or an intermittent no-start. It is usually the sensor, its wiring, or the connector.
High
Can I keep driving? Risky — a cam-position fault can cause hard starting, stalling, or a no-start; drive minimally and be prepared for it to quit.
Common symptoms
What you'll notice
- Check-engine light on
- Hard starting or intermittent no-start
- Stalling or rough running
- Hesitation and reduced power
Common causes
Most likely first
- Failed camshaft position sensor A (bank 1)Likely
- Signal wire shorted to ground or open in the circuitCommon
- Loose or corroded connector at the sensorCommon
- Damaged reluctor/tone ring on the camshaftLess often
- ECM fault (rare — verify wiring and sensor first)Less often
How to diagnose & fix
Work through it in order
- Scan and read freeze-frame data to confirm the fault is the bank 1 cam sensor A circuit.
- Inspect the sensor connector and wiring for a short to ground, oil contamination, or corrosion.
- Back-probe the sensor for supply, ground, and a clean signal while cranking.
- Check the sensor air gap and the camshaft reluctor ring for damage or metal debris.
- Replace the cam position sensor if it fails testing with good wiring. Clear and re-test.
FAQ
Quick answers
Is it safe to drive with P0342?+
Not really — the engine may stall or fail to restart without warning. Get it diagnosed before relying on the vehicle.
Can I just clear P0342?+
It returns quickly, and clearing it won't fix hard-start or stalling behaviour. The circuit fault has to be repaired.
Related codes
Often seen with P0342
Read & clear P0342 yourself
Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.
✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX