Electronic Shift Module (ESM)

U0121-LOST COMMUNICATION WITH ANTI-LOCK BRAKE MODULE

For a complete wiring diagram refer to the Wiring Information Electrical Diagrams

Theory of Operation

Some controllers communicate with other controllers over the CAN C bus. The Shift Lever Assembly (SLA) contains a Electronic Shift Module (ESM) that continuously monitors the bus activity and receives the messages it needs. The CAN C bus is also used to communicate transmission MIL status to the Engine Controller.

Refer to DTC Based Diagnostics and perform the appropriate diagnostic procedure. Testing and Inspection