P0340 – Camshaft Position Sensor “A” Circuit Malfunction (Dodge / Chrysler)

Randy Worner

By Randy Worner (Contact Me)
Last Updated 2020-12-14
ASE/ACA World Class Technician

CodeFault LocationProbable Cause
P0340 Camshaft Position Sensor “A” Circuit Malfunction
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Wiring, CMP sensor, ECM

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What Does Code P0340 Mean?

This generic Powertrain/Engine diagnostic trouble code applies to all Dodge/Chrysler makes/models, starting around 2003. These vehicles can have a single camshaft in block, or a single overhead camshaft (SOHC) or dual overhead camshafts (DOHC), but this code is strictly concerned about the incoming signal from the camshaft position sensor(s) from Bank 1 being missing at some point when it is not supposed to be. This is an electrical circuit fault, and it may or may not be there all the time.

The PCM uses the Camshaft Position Sensor to tell it when the Crankshaft Sensor signal is correct, when a given Crankshaft Position Sensor signal is timed to Cylinder #1 for timing, and it is also used for fuel injector synchronization / start of injection. If the Camshaft Position Sensor signal is not present at engine start up, the engine will crank but won’t start. If the signal goes missing after the engine starts, the engine will continue to stay running but once it is shut off, it will not restart. In all cases, it will set code P0340.

Where is the P0340 sensor located?

On most Dodge/Chrysler OHC engines the camshaft position sensor is mounted to the back of the cylinder head closest to the intake camshaft. On OHV or Cam-in-Block engines, the Camshaft Position Sensor is attached to the front of the engine closest to the camshaft itself.  Typically, the causes for this code to set are:

  • Intermittent open in the power supply circuit to the camshaft position sensor.
  • Intermittent short to ground in the power supply circuit to the camshaft position sensor
  • Intermittent open in the ground circuit to the camshaft position sensor
  • Intermittent open in the signal circuit to the camshaft position sensor
  • Intermittent short to 5 volts in the signal circuit to the camshaft position sensor
  • Intermittent short to ground in the signal circuit to the camshaft position sensor
  • Camshaft Position Sensor tone ring damage
  • Occasionally-Crankshaft Position Sensor producing intermittent signals

What are the common causes of code P0340?

Specific to Dodge and Chrysler products, these are the more common issues with the Camshaft Position Sensor and related components/circuitry:

  • Dodge Avengers w/2.4L/3.6L – Camshaft Position Sensors and Cam Phasers are the most common issues
  • Chrysler 300, Dodge Charger/Challenger w/2.7L/3.6L/5.7L – Camshaft Position Sensors, associated wiring and connectors,
  • Chrysler Minivans w/3.6L – Camshaft Position Sensors and Cam Phasers are the most common failings
  • Dodge Durango/Dodge Journey/Jeep Wrangler and Grand Cherokee w/3.6L – Camshaft Position Sensors and Cam Phasers are the most common problems
  • Dodge Dart w/2.0L – no known issues at this time / basic fault code diagnosis
  • Jeep Compass/Patriot w/2.0L or 2.4L – no known issues at this time / basic fault code diagnosis