Fault code P1565 – a step-by-step guide to diagnosing and fixing it

Error code P1565 is displayed and the check engine light is on - what does this mean?

The DTC P1565 is a manufacturer-specific fault code that is recognized by the OBD system and indicates a problem with the idle control valve or the throttle control. This trouble code mainly occurs in Ford vehicles and indicates a malfunction in the idle control system.

What can cause this error code?

• Defective idle control valve (IAC valve)
• Dirty or blocked throttle valve
• Damaged cables or plug connections to the IAC valve
• Defective throttle valve sensor
• Vacuum leak in the intake system
• Faulty engine control unit (ECM/PCM)
• Clogged air filter
• Defective throttle position sensor

What symptoms occur in parallel with fault code P1565?

• Irregular idling: Engine runs irregularly at idle or fluctuates in speed
• Starting problems: Difficulty starting the engine, especially when the engine is cold
• Stalling: Engine stalls at idle or when coming to a stop
• Increased fuel consumption: Poor fuel efficiency due to unoptimized air supply
• Jerking engine: Uneven engine running at low engine speeds
• Check engine light: Permanent display of the check engine light

How can the problem with fault code P1565 be rectified?

• Repairing fault code P1565 requires a systematic approach to identifying and eliminating the cause.
• Clean or replace the idle control valve: Remove the IAC valve, clean thoroughly with cleaning spray or replace completely if defective (costs: €50-200)
• Clean the throttle valve: Dismantle throttle body and remove deposits with special cleaner, then carry out basic adjustment
• Check and repair cable connections: Check all electrical connections to the IAC valve for corrosion or breaks and replace defective cables
• Check vacuum lines: Check all vacuum hoses for cracks or loose connections and replace damaged lines
• Replace the throttle position sensor: If the TPS sensor is defective, replace it with a new component and carry out calibration (costs: €80-150)
• Change air filter: Replace dirty air filter with new filter to ensure optimum air supply