P0340
PPowertrainCamshaft Position Sensor Circuit Fault (Bank 1)
What does this code mean?
Severity : HighP0340 indicates a fault in the camshaft position sensor circuit on bank 1. The engine control module compares this signal with the crankshaft signal to identify cylinders and synchronise injection and ignition. Without a reliable signal, starting can take longer and the engine may go into limp mode.
Symptoms
- Check engine light on.
- Long cranking or no start.
- Stalling or rough idle.
- Loss of power or limp mode.
- Higher fuel consumption.
Possible causes
- Faulty camshaft position sensor.
- Damaged wiring or connector.
- Short or open in the supply or ground circuit.
- Damaged camshaft reluctor.
- Incorrect timing, for example a jumped belt or chain.
- Engine control module fault, which is rare.
Diagnosis and repair
- Inspect the sensor connector and wiring.
- Measure supply, ground and signal with a multimeter or oscilloscope.
- Check cam and crank correlation in live data.
- Verify mechanical timing if the signals are out of phase.
- Replace the sensor if needed, clear the code and road test.
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Code
P0340
Category
Powertrain
Prefix
P
Standard
OBD-II / SAE J2012