B2581 on Ford
Passenger Seat Occupant Detection Circuit Short To Ground
B2581 on Ford vehicles indicates passenger seat occupant detection circuit short to ground. Au7o has documented this code across 1 Ford model — most commonly on Explorer. The Restraints Control Module / Occupant Classification System monitors the front passenger occupant detection sensor circuit and has detected that circuit shorted to ground, so the module can no longer determine whether the passenger seat is occupied or how it is loaded. Because passenger airbag suppression depends on that input, the system defaults to a fail-safe state. Note that this is a restraints code, not an HVAC code — the catalogue issue citing it (Ford Explorer blend door actuator) does not match this code's actual meaning. Typical repair costs on Ford range from $25 to $350, depending on the specific model and root cause.
Common Causes of B2581
- •Damaged or shorted occupant classification sensor mat / bladder in the passenger seat cushion
- •Chafed or pinched wiring under the passenger seat (seat travel damage, items caught under the seat)
- •Corroded or moisture-contaminated seat connector after a spill or water intrusion
- •Failed Occupant Classification System module or Restraints Control Module
- •Aftermarket seat covers, seat heaters or wiring modifications
B2581 on Ford by Model
Ford Explorer(1 issue)
- HVAC Blend Door Actuator Failure Causing Clicking Noise and No Heat or A/C2011-2019
The temperature/blend door actuator is a very common failure on the Explorer (shared with Taurus, Flex and Lincoln MKS/MKT). The actuator's internal plastic gears strip, producing a repeated clicking or knocking sound behind the dash and leaving the cabin stuck on hot or cold, or blowing the wrong temperature on one side. On older (2002-2010) Explorers the same symptom appears on the floor/mode and blend actuators. It is an inexpensive part but the noise and inability to control cabin temperature are constant annoyances.
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View B2581 across all makes →Frequently Asked Questions
What does B2581 mean on Ford?▼
B2581 stands for "Passenger Seat Occupant Detection Circuit Short To Ground." The Restraints Control Module / Occupant Classification System monitors the front passenger occupant detection sensor circuit and has detected that circuit shorted to ground, so the module can no longer determine whether the passenger seat is occupied or how it is loaded. Because passenger airbag suppression depends on that input, the system defaults to a fail-safe state. Note that this is a restraints code, not an HVAC code — the catalogue issue citing it (Ford Explorer blend door actuator) does not match this code's actual meaning. On Ford specifically, this code is documented across 1 model.
What causes B2581 on Ford vehicles?▼
Common causes on Ford: Damaged or shorted occupant classification sensor mat / bladder in the passenger seat cushion, Chafed or pinched wiring under the passenger seat (seat travel damage, items caught under the seat), Corroded or moisture-contaminated seat connector after a spill or water intrusion, Failed Occupant Classification System module or Restraints Control Module, Aftermarket seat covers, seat heaters or wiring modifications. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix B2581 on a Ford?▼
Repair costs on Ford range from $25 to $350, depending on the specific model and root cause.
Which Ford models have B2581 documented?▼
Au7o has documented B2581 on 1 Ford model: Explorer.