B2103 on RAM
Antenna Not Connected (PATS Transceiver)
B2103 on RAM vehicles indicates antenna not connected (pats transceiver). Au7o has documented this code across 1 RAM model — most commonly on 1500. 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 RAM range from $100 to $400, 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 RAM by Model
RAM 1500(1 issue)
- Sentry Key Immobilizer (SKIM/WCM) No-Start — Security Light On, Cranks But Won't Run1998-2010
Rams with the Sentry Key Immobilizer Module (SKIM/WCM) can lock out the fuel injectors if the module fails to read a valid transponder key. The engine cranks, fires for ~2 seconds, then dies, and the security/theft light stays on or blinks. Causes include a failing SKIM/WCM, a damaged antenna ring around the ignition lock, a worn transponder chip in the key, or wiring/connector corrosion.
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View B2103 across all makes →Frequently Asked Questions
What does B2103 mean on RAM?▼
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 RAM specifically, this code is documented across 1 model.
What causes B2103 on RAM vehicles?▼
Common causes on RAM: 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 RAM?▼
Repair costs on RAM range from $100 to $400, depending on the specific model and root cause.
Which RAM models have B2103 documented?▼
Au7o has documented B2103 on 1 RAM model: 1500.