Fault code P1260 – a step-by-step guide to diagnosing and fixing it

Error code P1260 is displayed and the check engine light is on - what does this mean?

The DTC P1260 is recognized by the OBD system if there is a problem with the anti-theft system (PATS - Passive Anti-Theft System). This manufacturer-specific error code mainly occurs in Ford vehicles and often prevents the engine from starting because the control unit does not recognize the key as authorized.

What can cause this error code?

• Defective or non-programmed transponder key
• Faulty antenna on the ignition lock
• Damaged PCM (Powertrain Control Module)
• Defective PATS control unit
• Broken cable connections between PATS components
• Weak battery in the key transponder
• Corroded plug connections on the ignition lock
• Defective ignition lock unit

What symptoms occur in parallel with fault code P1260?

• Starting problems: The vehicle cannot be started or the engine dies immediately after starting
• Flashing anti-theft light: The anti-theft indicator flashes quickly or lights up continuously
• Fuel pump inactive: The fuel pump is not activated
• Misfiring: The engine runs erratically or misfires
• No communication: The diagnostic device cannot communicate with the PATS system

How to fix the problem of error code P1260?

• Repairing EOBD error code P1260 requires a systematic approach to restore the anti-theft function.
• Reprogram the key: Use a professional diagnostic tool to erase all existing keys and then reprogram all authorized keys - this often resolves communication issues between the key and the system
• Replace PATS antenna: Replace the faulty transponder antenna on the ignition switch and perform a recalibration to restore proper key recognition
• PCM reset and reprogramming: Perform a full reset of the engine control unit and reprogram it with the latest software to fix communication errors
• Repair wiring harness: Check all connections between the PATS control unit, PCM and ignition switch for damage and repair any broken or corroded wires
• Replace PATS module: Replace the defective anti-theft control unit and program it with all authorized keys to restore full system functionality