568 Cruise control vacuum valve circuit malfunction

Make
Ford (1981-1995)
Category
Body
Severity
Check Engine Light
Applies to
1981-1995 Ford, Lincoln and Mercury EEC-IV vehicles

How to read it

Code 568 reads as 5 flashes, pause, 6 flashes, pause, 8 flashes on the check-engine light. Jumper the self-test input to signal return at the test connector, then run the key on engine off self test and the running self test, counting the check-engine flashes each time.

New to flash codes? The OBD-I code reading guide walks through the paperclip method, code 12, and reading two-digit codes.

What does Ford code 568 mean?

568. Cruise control vacuum valve circuit malfunction. This code sets when your vehicle computer detects cruise control vacuum valve circuit malfunction.

Common causes of 568

How to fix 568

  1. Check the circuit wiring and harness for damage, chafing or a poor splice
  2. Test the cruise control vacuum valve and replace it only if it fails its own test
  3. Test the ECM last, only after every circuit test has passed
  4. Clear the code, then retest to confirm the fix holds

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