P0340 Code - Camshaft Position Sensor 'A' Circuit Malfunction

What Does P0340 Mean?

OBD-II Code P0340 is defined as a Camshaft Position Sensor "A" Circuit Malfunction

The Camshaft Position Sensor measures the exact rotational position of the camshaft. This provides a critical data signal used by the Powertrain Control Module (PCM) to control Ignition Spark and Fuel Injector Timing. When this signal is interrupted for any reason, code P0340 is set and the MIL or Check Engine Light is illuminated.

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What are the common causes of P0340 ?

The most common cause of this code is related to oil (or other engine fluids) that have leaked onto sensors, wiring, or electrical connectors. This typically causes grounded, broken, or shorted wiring, along with loose or shorted electrical connectors. In some cases fluid contamination has also caused camshaft sensors to go bad. Some vehicles will store a camshaft position sensor circuit code if the crankshaft sensor goes bad. If one or the other is found to be faulty; it is recommended that camshaft and crankshaft sensors be replaced as a set. PCM failure is also possible but rarely occurs.

How do you troubleshoot P0340 ?

• Repairing or replacing the camshaft position sensor circuit wiring
• Repairing or replacing the camshaft position sensor circuit connector
• Replacing the camshaft position sensor
• Replacing crankshaft position sensor
• If misfire codes are present, performing a tune-up of the vehicle before replacing the camshaft position sensor
• Replacing or reprogramming the PCM

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