Code Definition

B1606 — Lamp Anti-Theft Indicator Circuit Short To Ground

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

About B1606

B1606 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.

When B1606 is stored, the module has detected a short-circuit (voltage pulled to ground or to supply) in the monitored circuit.

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.

B1606 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

The Body Control Module or Instrument Cluster on Ford vehicles equipped with the Passive Anti-Theft System (PATS) monitors the anti-theft indicator lamp circuit and reports a short to ground as DTC B1606. The cluster typically drives this lamp by switching the circuit to ground through an internal low side driver, which means the circuit normally rests at battery voltage when the lamp is commanded off. This code sets when the controlling module detects a permanent ground on the lamp drive line, preventing it from controlling the lamp's off state. With B1606 active the indicator may stay contin...

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