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P0340 Camshaft Position Sensor A Circuit Malfunction (Bank 1)

What it means

The computer isn't getting a proper signal from the camshaft position sensor.

Severity: Moderate to High

Can I drive it? May cause hard starting or stalling; drive cautiously.

Common causes (most likely first)

Faulty cam sensor
Wiring/connector damage
Timing chain/belt issue
Weak battery/charging (sometimes)

Likely fixes

Inspect wiring
Replace cam sensor
Check timing if sensor is fine

DIY parts cost

$20–$120

Approximate estimate

Shop repair cost

$120–$350

Approximate estimate, parts + labor

DIY difficulty

Easy to Moderate

Varies by vehicle

Cost ranges are rough, approximate U.S. estimates and vary widely by vehicle, region, and parts brand. Always confirm the diagnosis before buying parts.

Parts you may need

Camshaft position sensorCheck price

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