Code Definition

B1681 — PATS Transceiver Module Signal Is Not Received

System: Body  |  Type: Manufacturer-Specific  |  Make: Ford

About B1681

B1681 is a manufacturer-specific body diagnostic trouble code recorded for Ford vehicles. It belongs to the B-prefix family of codes, which covers body, interior, airbag, or comfort-electronics faults.

Scanning & clearing: Body (B) codes are often stored in the body control module, airbag module, or climate module. A basic OBD-II tool usually will not read body codes — an enhanced or OEM-level scan tool is typically required.

B1681 is a manufacturer-specific code. The same code string on a different make may have a different meaning. Always confirm the code's definition against the vehicle's service information for the specific make and model under test.

Code Information

B1681 is a Ford specific code indicating that the Powertrain Control Module (PCM) or Instrument Cluster is not receiving the expected signal from the PATS (Passive Anti Theft System) transceiver module. The transceiver is the antenna ring located around the ignition lock cylinder that energises the transponder chip in the key and relays the response to the theft control function. When the transceiver fails to deliver a valid signal during cranking or key on, the PATS function blocks engine start as a security measure and stores this code. Symptoms include a no start condition with the theft in...

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