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DTC Advanced Diagnostics: U129C-00
DTC U129C-00: F-CAN Malfunction (EPS Control Unit-Driving Support System Control Unit)
NOTE
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Initial Diagnosis:
The initial on-board diagnosis occurs right after the vehicle condition is turned to the ON mode, and the EPS indicator comes on, and continues until the indicator goes off. |
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Regular Diagnosis:
The regular on-board diagnosis begins right after the EPS indicator goes off, and it continues until the vehicle condition is turned to the OFF (LOCK) mode. |
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Review "How to troubleshoot the EPS system" before doing the DTC troubleshooting procedure. |
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Test-drive the vehicle according to local traffic conditions and regulations. Do not test-drive on a lift unless specified. |
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The possible causes shown may not be a complete list of all potential problems, and it is possible that there may be other causes. |
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Confirmation Procedure |
Basic Condition:
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12 volt battery voltage 10 - 16 V |
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IG voltage continued more than 10 V for at least 1 second |
With the Driving Pattern:
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1. |
Turn the vehicle to the ON mode. | |
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Execution |
Regular Diagnosis |
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Duration |
About 10 seconds |
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DTC Type |
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Fail Safe Action |
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Continue EPS function/assist |
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Stop LKAS function/assist | |
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Possible Cause |
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Open or Poor connection between the EPS control unit and the millimeter wave radar (F-CAN lines) |
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Millimeter wave radar internal failure |
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EPS motor/control unit internal failure | | |
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