Anti-Theft System Signal Engine Disabled
2014-2021 Mazda Mazda6 2.5L I4
Description
The anti-theft immobilizer system has detected an unauthorized start attempt and has disabled the engine. The PCM will not allow fuel injection or ignition until proper key authentication is received.
Symptoms
- Engine cranks but will not start
- Security light flashing on dashboard
- No fuel delivery or spark
- Engine starts then immediately dies
Common Causes
- Key transponder not recognized
- Faulty immobilizer antenna around ignition
- Incorrect or damaged key
- Immobilizer module failure
- Low key battery (push-button start systems)
Diagnostic Steps
- Try a second programmed key
- Check security indicator light behavior
- Inspect immobilizer ring antenna around ignition cylinder
- Verify key programming status with scan tool
- Check key battery if applicable
Repair Notes
Try a different programmed key first; reprogram keys or replace the immobilizer antenna if faulty.
Other Powertrain Codes
- P0001Fuel Volume Regulator Control Circuit/Open
- P0002Fuel Volume Regulator Control Circuit Range/Performance
- P0003Fuel Volume Regulator Control Circuit Low
- P0004Fuel Volume Regulator Control Circuit High
- P0010Intake Camshaft Position Actuator Circuit/Open Bank 1
- P0011Intake Camshaft Position Timing Over-Advanced Bank 1
- P0012Intake Camshaft Position Timing Over-Retarded Bank 1
- P0013Exhaust Camshaft Position Actuator Circuit/Open Bank 1
- P0014Exhaust Camshaft Position Timing Over-Advanced Bank 1
- P0015Exhaust Camshaft Position Timing Over-Retarded Bank 1
P1260 on Other Vehicles
Common Questions
What does code P1260 mean on a 2014-2021 Mazda Mazda6?
P1260 stands for "Anti-Theft System Signal Engine Disabled". The anti-theft immobilizer system has detected an unauthorized start attempt and has disabled the engine. The PCM will not allow fuel injection or ignition until proper key authentication is received.
What are the symptoms of P1260 on a Mazda Mazda6?
Common symptoms of P1260 include: Engine cranks but will not start, Security light flashing on dashboard, No fuel delivery or spark, Engine starts then immediately dies.
What causes P1260 on a 2014-2021 Mazda Mazda6?
Common causes of P1260 include: Key transponder not recognized, Faulty immobilizer antenna around ignition, Incorrect or damaged key, Immobilizer module failure, Low key battery (push-button start systems).