Fault code P1340 – a step-by-step guide to diagnosing and fixing it

Error code P1340 is displayed and the check engine light is on - what does this mean?

The DTC P1340 is recognized by the OBD system when there is a problem with the ignition control or the crankshaft/camshaft sensor timing. This manufacturer-specific error code mainly occurs in Nissan, Infiniti and some other brands and indicates a fault in the ignition timing system.

What causes can this fault code have?

• Defective crankshaft sensor
• Damaged camshaft sensor
• Worn timing chain or timing belt
• Loose or corroded plug connections
• Defective ignition coil or spark plugs
• Faulty engine control unit (ECU)
• Mechanical problems on the valve train
• Damaged sensor cables or lines
• Incorrect camshaft or crankshaft position

What symptoms occur in parallel with fault code P1340?

• Starting problems: The vehicle is difficult or impossible to start
• Uneven idling: Engine runs unevenly at idle speed
• Loss of power: Noticeable reduction in engine power
• Jerking engine: Uneven engine running while driving
• Increased fuel consumption: Engine runs inefficiently
• Misfiring: Noticeable interruptions in engine running
• Stalled engine: Vehicle stalls while driving

How to fix the problem of error code P1340?

• Repairing this EOBD fault code requires a systematic diagnosis of the ignition components.
• Check crankshaft and camshaft sensors and replace if defective, as these are essential for correct timing detection
• Check timing chain or timing belt for wear and replace if necessary to ensure correct valve timing
• Clean all electrical connections to the sensors and check that they are tight, as corrosion often leads to signal interference
• Test ignition coils and spark plugs and replace defective components to ensure proper ignition
• Check engine control unit with professional diagnostic software and reprogram or replace if necessary
• Carry out a mechanical check of the valve train and replace worn parts
• Check the complete wiring of the ignition sensors for damage and replace defective cables