OBD2 Code P0340: What It Means

Figuring out why your Check Engine Light is on means deciphering OBD-II (or “OBD2”) codes, and that can be kind … Continued

Figuring out why your Check Engine Light is on means deciphering OBD-II (or “OBD2”) codes, and that can be kind of annoying. That’s why Car Bibles did it for you! You’re welcome, now let’s get into solving your issue.

OBD2 P0340: What It Means

The P0340 code is luckily pretty easy to pin-point: Camshaft Position Sensor Circuit Malfunction.

Likely Symptoms 

Here’s what you may experience due to P0340 code.

  • Refusal to start. The car might not start if this code pops up.
  • Hard-starting. A car with this code will have trouble starting up.
  • Running rough. The car might run and idle rough, and experience a severe lack of power.

Probable Causes

Here’s what could be causing the issue:

  • Faulty cam position sensor wiring. The wiring that goes to the cam position sensor might be worn, corroded, frayed; any kind of poor condition.
  • A broken cam position sensor connector. The connector itself might be damaged and need replacement.
  • A dead cam position sensor. If the wiring is in good shape and tests for continuity, the sensor itself might be dead. This should be considered the last ditch effort to remedy the code, as it involves the most expense.
  • A dead crankshaft position sensor. The crankshaft position sensor might be dead, or the wiring leading up to it.
  • A faulty or broken PCM. This is the least-likely of likely items, and usually more codes will pop up if its the case.

What Part Is Potentially Affected?

The wiring, connectors, cam position sensor, and crankshaft position sensor are all potentially affected. These are all crucial components for your vehicle’s PCM to monitor the engine’s timing and run properly.

Possible Fixes

Here are the most common fixes to remedy P0340 code:

  • Inspect and test wiring and connectors. A close lookover of all the wiring that leads to the cam position sensor and crankshaft position sensor should be your first step. Look for fraying, corrosion, etc. A multimeter can be used to test continuity in each wire, confirming whether or not signals are being sent. If anything isn’t up to snuff, replace it utilizing proper wiring and shrink wrap.
  • Replace the cam position sensor or crank position sensor. These sensors can be a little pricey, so save this for after you rule out everything else. Luckily, they’re generally easy to remove and replace.

Finding The Parts You Need

Now that you’ve figured out what’s wrong with your hooptie, let’s talk about where you’re gonna find that part’s replacement.

There are plenty of places you can buy auto parts from, but Car Bibles gets paid if you click this Advance Auto link so that’s the one we’re serving up. Advance Auto Parts also has delivery, curbside pickup, and a host of helpful diagrams to aid your repair!

Peter Nelson

Peter NelsonPeter Nelson has been wrenching on and playing with cars since he started driving them quickly between the cones at Chicagoland autocross events in his late teens. Nowadays, he can be found wringing out his Mazda2 at tracks all over California. His writing background includes Winding Road, Donut Media, and Autolist.com. He's also an avid cyclist and '80s/'90s action film connoisseur. Contact the author here.