527 Neutral drive switch circuit open, A/C on
How to read it
Code 527 reads as 5 flashes, pause, 2 flashes, pause, 7 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 527 mean?
527. Neutral drive switch circuit open, A/C on. This code sets when your vehicle computer detects neutral drive switch circuit open, a/c on.
Common causes of 527
- Misadjusted park neutral switch
- Open or shorted wiring in the park neutral switch circuit
- Faulty park neutral switch
- Corroded or loose connector at the park neutral switch
- Faulty PCM input for the park neutral switch circuit
How to fix 527
- Confirm the code and read the flash sequence again
- Check the park neutral switch adjustment
- Inspect the park neutral switch and its wiring for damage and corrosion
- Test the switch for a correct state change
- Repair wiring or replace the switch only after the test fails