B2103 on Ford
Antenna Not Connected (PATS Transceiver)
B2103 on Ford vehicles indicates antenna not connected (pats transceiver). Au7o has documented this code across 1 Ford model — most commonly on F-150. Manufacturer-specific (Ford/Lincoln/Mercury). This is a continuous and on-demand code set by the Passive Anti-Theft System when the transceiver antenna ring around the ignition lock cylinder is disconnected, open, or internally damaged, so the module cannot read the transponder chip in the key. Ford service information lists "transceiver internal antenna damaged - replace transceiver" as a cause. In practice the engine may crank but not start, or start and immediately stall, with the theft light flashing; it often appears alongside B1681. Typical repair costs on Ford range from $100 to $500, depending on the specific model and root cause.
Common Causes of B2103
- •Failed or internally damaged PATS transceiver / antenna ring at the ignition lock cylinder
- •Transceiver connector unplugged, corroded, or loose after steering column or ignition work
- •Open or shorted wiring between the transceiver and the instrument cluster / PATS module
- •Aftermarket remote start or alarm wiring interfering with the transponder signal
- •Failed instrument cluster (which houses the PATS function on many Ford models)
B2103 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.
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View B2103 across all makes →Frequently Asked Questions
What does B2103 mean on Ford?▼
B2103 stands for "Antenna Not Connected (PATS Transceiver)." Manufacturer-specific (Ford/Lincoln/Mercury). This is a continuous and on-demand code set by the Passive Anti-Theft System when the transceiver antenna ring around the ignition lock cylinder is disconnected, open, or internally damaged, so the module cannot read the transponder chip in the key. Ford service information lists "transceiver internal antenna damaged - replace transceiver" as a cause. In practice the engine may crank but not start, or start and immediately stall, with the theft light flashing; it often appears alongside B1681. On Ford specifically, this code is documented across 1 model.
What causes B2103 on Ford vehicles?▼
Common causes on Ford: Failed or internally damaged PATS transceiver / antenna ring at the ignition lock cylinder, Transceiver connector unplugged, corroded, or loose after steering column or ignition work, Open or shorted wiring between the transceiver and the instrument cluster / PATS module, Aftermarket remote start or alarm wiring interfering with the transponder signal, Failed instrument cluster (which houses the PATS function on many Ford models). Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix B2103 on a Ford?▼
Repair costs on Ford range from $100 to $500, depending on the specific model and root cause.
Which Ford models have B2103 documented?▼
Au7o has documented B2103 on 1 Ford model: F-150.