B2103: Antenna Not Connected (PATS Transceiver)
2 vehicles · 2 makes · $100-$500 repair
Most Reported On
B2103 is an OBD-II diagnostic trouble code meaning “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. This code is most commonly reported on 1998-2010 RAM 1500, and 1997-2004 Ford F-150 (XL, XLT, Lariat, FX4, King Ranch), with repair costs ranging from $100 to $500.
Common Causes
Typical Repair Cost
Based on 2 documented vehicle-specific issues. Actual cost depends on root cause and vehicle.
Diagnostic Tools
B2103 does not use the standard P/B/C/U prefix. It may be a manufacturer-specific code, so verify that a scanner supports your exact year, model and module before buying.
FAQ
What does B2103 mean?
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.
What are the most common causes of B2103?
The most common causes of B2103 are: 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). The specific cause varies by vehicle.
How much does it cost to fix B2103?
Repair costs for B2103 range from $100 to $500, depending on the vehicle and root cause.
Which vehicles are affected by B2103?
Au7o has documented B2103 across 2 vehicle models from 2 manufacturers: Ford, RAM.
Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.