Ask Andy AIP0340 Camshaft Position Sensor A Circuit Malfunction (Bank 1 or Single Sensor)
What it means, what causes it, and what it costs to fix.
What P0340 means
The camshaft sensor signal is missing or out of range, so the computer has trouble syncing fuel injection and spark to the right cylinder.
Can I drive with P0340?
Severity: Medium. Fix soon so it doesn't turn into something bigger.
Often drivable but may start hard or stall. Fix it soon.
Get a diagnosis for your exact car
Tell Andy your year, make, model, and symptoms. You'll get best case, most likely, and worst case, with parts and labor costs. Free, in about 15 seconds.
Ask Andy about P0340Symptoms
- Long crank before starting
- Stalling
- Rough running
- Reduced power
Common causes
Most likely first.
- Failed cam position sensor
- Wiring or connector fault
- Timing chain or belt jumped (less common)
- Oil-soaked connector
How to diagnose P0340
- Check the connector for oil intrusion or corrosion.
- Test the sensor's power, ground, and signal.
- If correlation codes are also present, check timing.
Tip: most US auto parts stores will read your codes for free.
Repair costs
| Cam position sensor | $100–$300 installed |
| Wiring repair | $50–$250 |
Typical US prices. Your vehicle, region, and shop rates will change these.
P0340 FAQ
What does P0340 mean?
P0340 means "Camshaft Position Sensor A Circuit Malfunction (Bank 1 or Single Sensor)." The camshaft sensor signal is missing or out of range, so the computer has trouble syncing fuel injection and spark to the right cylinder.
Can I drive with a P0340 code?
Often drivable but may start hard or stall. Fix it soon.
What is the most common cause of P0340?
The most common cause is: Failed cam position sensor. Other causes include wiring or connector fault and timing chain or belt jumped.
How much does it cost to fix P0340?
Typical repairs run about $50 to $300 in the US, depending on the cause. Cam position sensor: $100–$300 installed.
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