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DTC U2144-87: Lost Communication with BMU
 
 
 
 
DTC SET CONDITIONS
Check Condition
  • Power supply mode of electric motor switch is ON.
Judgment Criterion
  • CAN signals from the battery management unit (BMU) cannot be received for 2 seconds or higher.
 
 
FAIL-SAFE AND BACKUP FUNCTION
None.
 
 
OBD-II DRIVE CYCLE PATTERN
None.
 
 
TROUBLESHOOTING HINTS (The most likely causes for this code to be set are:)
  • CAN line harness damage or connector damage.
  • BMU failed.
  • ECM failed.
 
 
DIAGNOSIS
Required Special Tools:
  • MB992744: Vehicle communication interface-Lite (V.C.I.-Lite)
  • MB992745: V.C.I.-Lite main harness A
  • MB992747: V.C.I.-Lite USB cable short
  • MB992748: V.C.I.-Lite USB cable long
1.STEP 1. Using scan tool (M.U.T.-III SE), DTC recheck after erasing DTC.
After erasing the DTC, check again to see if the DTC is set again.
(1) Use scan tool (M.U.T.-III SE) to erase the DTC.
(2) Turn OFF the power supply mode of the electric motor switch.
(3) Turn ON the power supply mode of the electric motor switch.
(4) Use scan tool (M.U.T.-III SE) to recheck the DTC.
Q: Is DTC U2144-87 set?
Use scan tool (M.U.T.-III SE) to perform CAN bus line diagnostic (Refer to ELECTRICAL & POWER CONTROL, LAN System – CAN Fundamental – Basic Inspection – Diagnosis and Repair Workflow – Trouble Diagnosis Flow Chart Trouble Diagnosis Flow Chart).
Intermittent malfunction (Refer to GENERAL INFORMATION, General Information – How to Use Troubleshooting/Inspection Service Points – How to Cope with Intermittent Malfunctions HOW TO COPE WITH INTERMITTENT MALFUNCTIONS).