OBD Codes List

Diagnostic reference · C0565

C0565

ABS Control Module System Voltage High

System
Chassis control (C code)
Lamp
ABS Light
Category
Chassis

What it means

C0565 means ABS Control Module System Voltage High.

Where it lives

For C0565, the part to look at first is the module named here.

Check these first

  • A charging system that supplies too much voltage
  • A failed alternator voltage regulator
  • An open or short in the ABS module power circuit
  • A poor ground at the ABS module

What to do next

  1. Read system voltage at the ABS module on a scan tool
  2. Test the alternator output and voltage regulator
  3. Inspect the ABS module power and ground circuits
  4. Check the battery and charging system connections
  5. Repair the charging fault or the ABS module ground
  6. Clear the code and retest

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Updated

Generic SAE J2012 definition. Last updated 2026-10-10.