Code
P1260
CHRYSLER
P — Powertrain
Last Test Failed SCC Or Theft Detected Vehicle Immobilized
Views:
UK: 21
EN: 56
RU: 43
AI status
Completed
Completed
100%
Causes
- Faulty or unrecognized/transponder key or key fob
- Damaged or disconnected immobilizer/antenna coil (RF reader)
- Body Control Module (BCM) or Security Control Module fault
- PCM/ECM not receiving immobilizer authorization message
- Poor battery, blown fuse, or poor ground affecting modules
- Wiring harness damage or poor connector contact
Symptoms
- Engine will not crank or cranks but does not start
- Security or immobilizer warning lamp illuminated or flashing
- No fuel pump prime or fuel injectors disabled
- Starter motor not engaged or starter relay not energized
- Key recognition failure messages on dash or infotainment
What to check
- Use a capable scan tool to read stored codes from PCM and BCM/security module and note freeze frame data
- Verify vehicle battery voltage (should be >12.4 V) and check charging system
- Inspect fuses and relays for the security/BCM and PCM circuits
- Check for additional related codes in network modules (BCM, IPC, PCM)
- Confirm the key(s) are the correct and programmed keys for the vehicle
- Observe the security/immobilizer lamp behavior during key on and cranking
Signal parameters
- Transponder ID read by antenna coil (present/blank)
- Antenna coil supply voltage and signal waveform/voltage spikes
- BCM security status flag/authorization bit
- PCM authorization received flag (yes/no)
- Starter relay control signal (PCM/BCM to relay)
- CAN bus message count and error frames between BCM and PCM
Diagnostic algorithm
- Connect full-feature scan tool and record all DTCs from PCM, BCM and security modules; clear codes and attempt to reproduce P1260. 2) Verify battery condition and fuses; restore correct battery voltage and retest. 3) Check immobilizer/antenna coil power, ground, and signal with meter/oscilloscope; inspect connector pins for corrosion or loose contacts. 4) Try known-good programmed key(s) if available; if a spare works, suspect faulty key transponder. 5) Monitor CAN bus traffic while performing a key-on/start attempt to confirm PCM receives security authorization message from BCM; if missing, trace network/wiring. 6) If antenna coil and keys are good but authorization not granted, test/replace security (SCC/BCM) module or reflash module software per manufacturer service information. 7) If module replacement is required, ensure keys are reprogrammed/relearned per factory procedure; follow secure dealer-level procedures for immobilizer programming. 8) After repairs, clear codes and perform multiple key-on/start cycles and drive verification to confirm the condition is resolved.
Likely causes
- Transponder chip in key not being read (antenna coil or key fault)
- Faulty Security/BCM module or corrupted software
- CAN/bus communication error between BCM and PCM
- Intermittent power/ground to immobilizer circuits
- Deliberate tamper or theft attempt triggered immobilizer
Fault status
Status
Security/immobilizer self-test failed or theft detected — vehicle immobilized by security system.
Repair difficulty: Medium
Diagnostic time: 1-3 hours
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