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All codes/P0340

P0340

Camshaft Position Sensor 'A' Circuit Malfunction (Bank 1 or Single Sensor)

High severity

This code indicates a problem with the signal from your engine's camshaft position sensor, which tells the car's computer the position of the camshaft. This information is used to synchronize fuel injection and ignition with the crankshaft.

Camshaft Position Sensor 'A' Circuit Malfunction (Bank 1 or Single Sensor)

Common causes

  • Faulty Camshaft Position Sensor

    The sensor itself can fail, providing an intermittent or no signal to the PCM.

    high

    Typical part cost: $40-120 part

  • Wiring Harness Issues (open, short, corrosion)

    Damaged wires or corroded connectors can prevent the sensor signal from reaching the PCM.

    medium

    Typical part cost: $0-150 for repair

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First things to check

  1. 1Inspect the camshaft position sensor wiring and connector for damage, corrosion, or loose connections.
  2. 2Test the camshaft position sensor's resistance and signal output using a multimeter or oscilloscope.

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Tools you may need

Already have a compatible scanner? Use it. If not, a Bluetooth OBD2 adapter can help you confirm engine codes and check supported live sensor data before replacing parts.

Illustration of a Bluetooth OBD2 adapter, not a product photo

Basic checks

Veepeak OBDCheck BLE

A Bluetooth LE adapter for reading standard engine codes and supported live data.

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Illustration of a Bluetooth OBD2 adapter, not a product photo

Regular diagnostics

vgate iCar Pro BLE 4.0

A Bluetooth LE adapter with an automatic sleep feature for routine code and sensor checks.

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Illustration of a Bluetooth OBD2 adapter, not a product photo

Another option

OBDLink CX

A Bluetooth LE adapter to consider when comparing supported vehicles and diagnostic apps.

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Illustrations shown, not product photos. Check vehicle, phone and app compatibility before buying. These adapters do not guarantee access to ABS, airbags or manufacturer-specific systems. Clearing a code does not repair the fault and can reset emissions readiness monitors.

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Related codes

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Frequently asked questions

What does the camshaft position sensor do?

The camshaft position sensor monitors the position of the camshaft, which controls valve opening and closing. This information is used by the engine computer to synchronize fuel injection and ignition with the crankshaft position.

Can a bad camshaft sensor prevent my car from starting?

Yes, if the engine computer doesn't receive a signal from the camshaft position sensor, it may not be able to properly time fuel injection and ignition, preventing the engine from starting or causing it to run very poorly.

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