Code Definition

B1842 — Wiper Front Power Circuit Short To Battery

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

About B1842

B1842 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 B1842 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.

B1842 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 B1842 fault code is set by the Generic Electronic Module (GEM) or Central Timing Module (CTM) when it detects an unexpected battery voltage on the front wiper motor power circuit. The module monitors the wiper power feed and expects voltage only when it has commanded the wiper power relay closed. When voltage is present at the monitor pin while the relay is commanded open, the module logs B1842 as a short to battery condition. The driver may notice the front wipers running with the ignition off, wipers that cannot be switched off normally, blown wiper fuses, or in some cases no symptom oth...

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