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Trouble code libraryIgnition and misfires

P0340 Camshaft position sensor problem

Generic SAE definitionCamshaft position sensor A circuit (Bank 1 or single sensor)

Drive gentlyYou can drive it, but take it easy and get it looked at soon – waiting usually makes the repair bigger.

Check this first

Check the connector at the sensor, then the oil level – some engines use oil pressure to move the cam.

What usually fixes it

In the order a good shop checks them. Typical total: $119–$2,500 at $130 an hour.

  1. Camshaft position sensor

    $134–$322

    A failed sensor makes it hard to start and run rough.

  2. Wiring or connector

    $140–$315

    A broken wire looks exactly like a failed sensor.

  3. Timing chain wear

    $1,132–$2,500

    If the chain is stretched, the cam really is in the wrong place.

Code titles are the generic SAE definitions. Prices are typical US parts and labor for a common car or light truck – a guide for judging a quote, not a quote. Always confirm a repair against the vehicle in front of you.

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See what your vehicle says about P0340

A stored code is a headline, not the story. The vehicle also holds the conditions from the moment the code set, how close each part is to the limit it fails at, what the fuel trims are doing, and whether the fault is still happening. Drive DTC reads all of it with a USB adapter and a Windows PC – read-only by design.

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The Trouble codes screen in Drive DTC: stored, pending and permanent counts, then C0040-13 explained in plain English with what to check first, likely fixes in order and typical cost ranges

More in Ignition and misfires

All 25 codes in this group
P0325Knock sensor 1 circuit (Bank 1 or single sensor) P0330Knock sensor 2 circuit (Bank 2) P0335Crankshaft position sensor A circuit P0345Camshaft position sensor A circuit (Bank 2) P0351Ignition coil A primary/secondary circuit P0352Ignition coil B primary/secondary circuit