Code Definition

B1810 — Lamp Backup Switch Input Circuit Failure

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

About B1810

B1810 is a manufacturer-specific body diagnostic trouble code. It belongs to the B-prefix family of codes, which covers body, interior, airbag, or comfort-electronics faults.

When B1810 is stored, the module has detected an electrical-circuit fault in the wiring, connector, or driver associated with the named component.

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.

B1810 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 (BCM) monitors an input signal from the backup lamp switch, typically a mechanical switch on the transmission housing or an internal contact within the transmission range sensor, which closes when the gear selector is moved into reverse. DTC B1810 sets when the BCM detects that the backup switch input is providing an invalid signal pattern, such as a state that does not correlate with the transmission range sensor data on the vehicle network, or a voltage level that falls outside the expected high or low logic thresholds. The backup switch input drives the backup lamp o...

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