This guide provides instructions on how to diagnose and resolve the U013C trouble code on Doosan Stage V excavators.
The error message indicates a “Check Sum Error of CAN Receive Frame SMVCU”, which relates to communication issues between the VCU (Vehicle Control Unit) and the pedal or engine speed demand signal.
Preparations:
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Doosan Diagnostic Tool DDT & G2 Scan Software Free Download
Doosan uVIM Diagnostic Tool
Error Code Details
Code: U013C
Description: Message Check Sum Error of CAN Receive Frame SMVCU (Pedal & Engine Speed Demand from VCU)
E-SPN FMI: E06540022
Possible Causes
- Electrical problem in the VCU (abnormal network communication)
- Electrical issue in the CAN wiring harness, such as poor insulation or abnormal resistance
Effect
- Check Engine (CE) lamp ON
- Torque Reduction 1 (Mild) — slight reduction in engine performance
Component Location
The pedal module and its connector locations vary depending on the excavator model and application.
Diagnostic Conditions
- The system checks the CAN frame continuously during every sample period.
Fault Code Activation Condition
The U013C code is triggered when the Check Sum of the received CAN frame does not match the value defined by the internal algorithm.
Fault Code Clearing Condition
The code clears automatically when the correct Check Sum data is received in the CAN frame.
Checklist
- Inspect and verify the VCU connections.
- Check the CAN wiring harness for damage, poor insulation, or abnormal resistance.
- Confirm connector pins are clean, secure, and free of corrosion.
- Ensure stable communication between SMVCU and VCU.
More topics for Doosan,please refer to:Doosan Trouble Repair