529 Data communication link or electronic engine controller fault
How to read it
Code 529 reads as 5 flashes, pause, 2 flashes, pause, 9 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 529 mean?
529. Data communication link or electronic engine controller fault. This code sets when your vehicle computer detects data communication link or electronic engine controller fault.
Common causes of 529
- Open or shorted wiring in the data link
- Corroded or loose connector on the data link
- Poor ground at a module on the link
- Faulty module on the data link
- Faulty PCM communication circuit
How to fix 529
- Confirm the code and read the flash sequence again
- Inspect the data link wiring and module connectors
- Check the grounds at each module on the link
- Repair wiring or a bad ground before replacing a module
- Replace a failed module only after the link test fails