DTC U0331: ECU internal error (ROM)
DTC SET CONDITION
If the ETACS-ECU error counter value is detected to be "255," DTC No. U0331 is set, and the ETACS-ECU is set again. DTC No. U0331 exists only for the past trouble.
TROUBLESHOOTING HINTS
The ETACS-ECU may be defective.
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