DTC No. U21A0-81 Driving mode CAN 388 DLC diagnosis

DTC SET CONDITION

Check Condition

During the BMU operation

Judgment Criterion

The data length error of the CAN signal received from the PHEV A/C amplifier is detected.

TROUBLESHOOTING HINTS

Malfunction of the PHEV A/C amplifier
Malfunction of the BMU

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.Check whether the DTC is set again.

Is the DTC set?

Replace the PHEV A/C amplifier (Refer to Removal and Installation

). Then,

The trouble can be an intermittent malfunction (Refer to General Information - How to Use Troubleshooting/Inspection Service Points, How to Cope with Intermittent Malfunctions HOW TO COPE WITH INTERMITTENT MALFUNCTIONS

2.Check whether the DTC is set again.

Is the DTC set?

Disassemble the drive battery (Refer to SERVICE PROCEDURE

). After the disassembly, replace the BMU (Refer to BATTERY MANAGEMENT UNIT (BMU) REMOVAL AND INSTALLATION

The procedure is complete.