P0339 engine won't start

P0339 is a Crankshaft Position Sensor fault.

This doesn't necessarily mean that the sensor itself is faulty, although it may be. What P0339 means it the engine ECU has not received an expected signal from the crankshaft position sensor input, when it expected there to be one.

With a P0339 and an poor or nonexistent crankshaft signal a the ECU, the engine is inhibited from running. This is to protect the engine from further damage.

The reasons you may be suffering from a P0339 and a non starting Citroen C3 is due to a faulty crankshaft position sensor. These can fail by physically breaking or fail electrically internally. Replacing the sensor doesn't need any programming and will clear the fault.

Other reasons for a poor or missing signal from the Crankshaft Position Sensor can be due to a poor connection at the plug and socket of the sensor or damaged wiring to the ECU from the sensor. Poorly refitted looms, clips and pipes can all cause a cable to rub through and fail a circuit with a fault.

Just clearing the P0339 fault from the ECU with an OBD2 tool won't allow the engine to run. You need to fix the P0339 fault by checking the points listed above and changing the sensor if necessary.


If you have a petrol engine, also check the injector electrical plugs as these have caused cam/crank faults in the past.


If you have a diesel engine, crank fault can be cause by a poor connection to the crank position sensor. tips-for-a-diesel-powered-citroen-c3-f6 ... -t332.html