Code Definition

B1838 — Battery Saver Power Relay Circuit Failure

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

About B1838

B1838 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 B1838 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.

B1838 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 B1838 fault code is set by the Generic Electronic Module (GEM) or Body Control Module (BCM) when it detects a circuit malfunction in the battery saver power relay control circuit. On Ford vehicles, the battery saver relay supplies power to accessories such as interior lighting, courtesy lamps, and the radio accessory feed for a programmed time period after the ignition is switched off, then drops out to prevent unnecessary battery drain. The module monitors the relay control circuit for open, short to ground, or short to power conditions, and sets this code when the actual circuit state do...

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