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Home >> Dodge and Ram >> 2024 >> ProMaster 2500 Base >> Repair and Diagnosis (Single Page) >> Transmission >> Automatic Trans >> (948TE Electronic Shift Module (ESM) - Electrical Diagnostics) (1 Of 2) >> DTC Troubleshooting >> U1040-00 ESM Detected Communication Error From EVCU >> Possible Causes
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Possible Causes

Possible Causes
CAN BUS CIRCUITS OPEN OR SHORTED
DTCS RELATED TO BATTERY VOLTAGE, IGNITION, OR VIN MESSAGES
BODY CONTROL MODULE (BCM) NOT CONFIGURED CORRECTLY
ELECTRIC VEHICLE CONTROL UNIT (EVCU) POWER AND GROUND
ELECTRIC VEHICLE CONTROL UNIT (EVCU)
ELECTRONIC SHIFT MODULE (ESM)
WARNING:

On vehicles equipped with the high voltage system, you must thoroughly read and follow all High Voltage Safety procedures. In addition, before performing any diagnostic or service procedure near a high voltage component, you must perform the High Voltage Power Down. Failure to follow these instructions may result in possible serious or fatal injury.

Refer to VEHICLE HIGH VOLTAGE POWER DOWN to perform the High Voltage Power Down procedure.

Always perform the PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE before proceeding. Refer to  PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE   .