Immobilizer to PCM Signal Error
2012-2018 Ford Focus Electric Electric Motor
Description
The PATS (Passive Anti-Theft System) immobilizer is not communicating properly with the PCM. The security signal between the instrument cluster and PCM does not match, preventing proper engine operation.
Symptoms
- Check Engine Light
- Engine may not start
- Security light flashing
- Engine starts then dies
Common Causes
- Faulty transponder key
- PATS transceiver malfunction
- Instrument cluster communication error
- PCM not properly programmed
- Low battery voltage during key programming
Diagnostic Steps
- Try a different programmed key
- Check PATS indicator light behavior
- Verify key is programmed (check NUMKEYS PID)
- Inspect PATS transceiver around ignition cylinder
- Check battery voltage
Repair Notes
Try second key. Reprogram keys if needed. Replace PATS transceiver if faulty. May require dealer-level scan tool.
Related Codes
Other Powertrain Codes
- P0070Ambient Air Temperature Sensor Circuit
- P0071Ambient Air Temperature Sensor Range/Performance
- P0072Ambient Air Temperature Sensor Circuit Low
- P0073Ambient Air Temperature Sensor Circuit High
- P0115Engine Coolant Temperature (ECT) Sensor 1 Circuit
- P0116ECT Sensor 1 Circuit Range/Performance
- P0117ECT Sensor 1 Circuit Low Input
- P0118ECT Sensor 1 Circuit High Input
- P0119ECT Sensor 1 Circuit Intermittent
- P0125Insufficient Coolant Temperature for Closed Loop Fuel Control
P1259 on Other Vehicles
Common Questions
What does code P1259 mean on a 2012-2018 Ford Focus Electric?
P1259 stands for "Immobilizer to PCM Signal Error". The PATS (Passive Anti-Theft System) immobilizer is not communicating properly with the PCM. The security signal between the instrument cluster and PCM does not match, preventing proper engine operation.
What are the symptoms of P1259 on a Ford Focus Electric?
Common symptoms of P1259 include: Check Engine Light, Engine may not start, Security light flashing, Engine starts then dies.
What causes P1259 on a 2012-2018 Ford Focus Electric?
Common causes of P1259 include: Faulty transponder key, PATS transceiver malfunction, Instrument cluster communication error, PCM not properly programmed, Low battery voltage during key programming.