Code Definition

B1188 — External Device (USB) Communication Fault

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

About B1188

B1188 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.

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.

B1188 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 Infotainment Control Module (ICM) monitors the USB port 5V supply, ground, and differential data lines (D+ and D minus) to verify proper device enumeration, power delivery, and data transfer. DTC B1188 is logged when the module detects a USB communication error such as a broken data signal, a short to ground or battery voltage on the USB lines, a failed device handshake, or a supply voltage out of specification (typically outside 4.75V to 5.25V) for longer than the defined threshold (typically greater than one second) during USB device connection or data transfer. The ICM uses the USB cont...

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