Parts
$20–200
P0340 — Camshaft Position Sensor Circuit
CAUTIONIs it safe to drive? The cam sensor helps with timing and injector sequencing. May cause hard starts or stalling; usually driveable but address it.
What P0340 means
The camshaft position sensor signal is missing or implausible. The engine can often run on the crank sensor alone but starts harder and may stumble.
Most likely causes (in order)
- Failed cam position sensor
- Wiring / connector
- VVT/timing issue moving the cam reference
- Reluctor/tone-ring damage
Symptoms you might notice
- Hard starting
- Stalling / stumble
- Check-engine light
What to check first
Check the cam sensor signal and wiring; if timing-related codes are also present (P0016), chase the timing/VVT side.
Repair cost & difficulty
Labor
0.5–2 hr
Difficulty
Moderate