Causes, Symptoms, Severity and Cost

Technical Description:

There is a problem in the camshaft position sensor circuit.

What P0340 really means:

The sensor measures how fast the camshaft rotates, and the position of the camshaft in the rotation. This information is used by the on board computer to initiate fuel injector spray, and in conjunction with the crankshaft position sensor to determine ignition timing. A problem with this circuit could be in the sensor itself, or the wiring, or the on board computer.

What are the symptoms of a P0340 code?

This code can mean a lot of trouble for the car. Many cars will not start if a camshaft position sensor is not read by the computer. If the car does start, it may randomly stall, misfire severely, or lack any power. This happens because the computer has little or no idea when to fire the injectors, consequently it does not fire them at all or takes a best guess.

What is the severity of a P0340 code?

Critical. Take the vehicle to a mechanic immediately.

What type of repair is typically required for a P0340 code?

Camshaft position sensor replacement. This is a high priority code that must be addressed as soon as possible. If the car is still running even if it may be running poorly, find a good mechanic and bring it right down, Many times the car will have to be towed because the engine will not turn over or stay running. Usually, the repair is replacement of the sensor but the wires and the computer will have to be checked over just to be sure.

What is the cost to resolve a P0340 code?

  • Estimated part(s) cost = $100
  • Estimated labor cost (including diagnosis) = $50-$100
  • Estimated total cost= $150-$200

*A diagnosis is almost always required for a bad camshaft position sensor circuit, but it is brief and should not cost more than $50. Many times the shop will include the diagnosis in the price for the installation or repair because the sensor must be removed to test. On most cars, and there are exceptions, the sensor will cost around $100 and the labor for installation will be in the $50 to $100 range. The exception in the case are cars that still use a distributor where the camshaft position sensor is built into it. In these cases the distributor will have to be replaced and the price climbs into the $250 to $350 range with a similar installation of $50 to $100. In rare cases, the problem lies in the on board computer which will cost anywhere from $300 to $800 with a programming/installation charge between $100 to $200.

If you vehicle is currently throwing this code, schedule an appointment with a mechanic immediately. Don't have a regular mechanic? No problem. Compare pricing and schedule an appointment with mechanics in your area with Openbay.

Service article written by an ASE Master Technician

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