Computer Prank

Sept. 18, 2017

This bulletin applies to 2014 Chevy Malibu vehicles. A technician may find when performing a DTC check using a scan tool that the Multi-axis Acceleration Sensor Module has a DTC U0121 (loss of communication with the EBCM) set in history.

If the DTC is cleared, they may find that the DTC sets again and immediately goes to history during the next ignition cycle. No messages or MIL will display on the IPC.

According to Chevy, do not replace any components for this condition.

This is a characteristic of normal operation. At key-up, the Multi-axis Acceleration Sensor Module is looking for a response from the EBCM right away. The DTC U0121 momentarily may set and then go to history when it does not see an immediate response.