P1260 on Ford
Theft Detected - Vehicle Immobilized
P1260 on Ford vehicles indicates theft detected - vehicle immobilized. Au7o has documented this code across 1 Ford model — most commonly on F-150. Manufacturer-specific code, defined on Ford, Lincoln, Mercury and Mazda (and Ford-derived Jaguar/Land Rover applications) as a PATS/immobilizer security-protocol violation: the PCM either received a theft signal from the anti-theft module or never received a valid authorization signal, and has disabled the engine. The usual symptom is an engine that cranks but will not start, or starts and immediately dies, often with a flashing security light. Note that some other manufacturers assign this same number to unrelated systems, so confirm the definition for your make before diagnosing. Typical repair costs on Ford range from $100 to $500, depending on the specific model and root cause.
Common Causes of P1260
- •Unprogrammed, damaged, or worn transponder key
- •Faulty or misaligned transceiver ring around the ignition lock cylinder
- •Weak battery, improper jump-start, or a battery replacement causing a failed immobilizer handshake
- •Wiring or connector fault between the immobilizer/anti-theft module and the PCM
- •Incorrectly programmed PCM or instrument cluster (for example after a used-module swap)
- •A genuine prior theft attempt that latched the immobilized state
P1260 on Ford by Model
Ford F-150(1 issue)
- PATS Anti-Theft No-Start — Cranks but Won't Start with Theft Light Flashing1997-2004
The Passive Anti-Theft System (PATS) on these trucks disables fuel/injection when the PCM cannot verify the key transponder, leaving the truck cranking but not starting with the dash theft/security light flashing rapidly. Common triggers are a worn or dead key transponder, a loose or damaged transceiver antenna ring around the ignition cylinder, corroded PCM grounds (water intrusion at the passenger cowl/windshield), or intermittent PCM power. It often starts as an intermittent no-start that worsens.
Looking for P1260 on a different make?
View P1260 across all makes →Frequently Asked Questions
What does P1260 mean on Ford?▼
P1260 stands for "Theft Detected - Vehicle Immobilized." Manufacturer-specific code, defined on Ford, Lincoln, Mercury and Mazda (and Ford-derived Jaguar/Land Rover applications) as a PATS/immobilizer security-protocol violation: the PCM either received a theft signal from the anti-theft module or never received a valid authorization signal, and has disabled the engine. The usual symptom is an engine that cranks but will not start, or starts and immediately dies, often with a flashing security light. Note that some other manufacturers assign this same number to unrelated systems, so confirm the definition for your make before diagnosing. On Ford specifically, this code is documented across 1 model.
What causes P1260 on Ford vehicles?▼
Common causes on Ford: Unprogrammed, damaged, or worn transponder key, Faulty or misaligned transceiver ring around the ignition lock cylinder, Weak battery, improper jump-start, or a battery replacement causing a failed immobilizer handshake, Wiring or connector fault between the immobilizer/anti-theft module and the PCM, Incorrectly programmed PCM or instrument cluster (for example after a used-module swap). Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P1260 on a Ford?▼
Repair costs on Ford range from $100 to $500, depending on the specific model and root cause.
Which Ford models have P1260 documented?▼
Au7o has documented P1260 on 1 Ford model: F-150.