U0157: Lost Communication With Information Center B

What does U0157 mean?

U0157 is a diagnostic trouble code indicating "Lost Communication With Information Center B". The vehicle's main computer has lost its ability to communicate with a specific module over the data bus. This could be caused by a wiring fault, a blown fuse, or a failed control module.

Symptoms you may notice

• Check engine light (MIL) illuminated on dashboard
• Possible issues with communication bus operation
• Vehicle may enter reduced power mode (limp mode)

Common causes

• Failed control module
• CAN bus wiring fault or short
• Blown fuse to the affected module
• Water intrusion in a connector or module
• Battery voltage too low

What should you do?

This code sits in the instrument cluster or driver display. The car itself may be fine, but you can lose the speedometer, the fuel reading or the warning lights, which means the next fault the car develops may not be able to tell you about itself. Get it looked at rather than driving on a blank dash.