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Code
C0550
ABS

ABS control unit internal fault

The ABS control unit has an internal fault.

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Most likely causes

  1. Failed ABS module
  2. Software fault
  3. Low voltage

Symptoms you may notice

  • ABS/ESP light
  • Systems disabled

Checks to run

  1. Check voltage
  2. Scan the ABS module

Tools you may need

OBD-II scanner
Always diagnose before replacing. Codes share symptoms; confirm the cause with measurements before buying parts.

Related codes in ABS

C0561

ABS system voltage out of range
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