Ford 27 Vehicle speed sensor signal fault on 2.3L turbo models
How to read it
Code 27 reads as 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 How to Read Ford EEC-IV Self-Test Codes walks through the test and what the numbers mean. The general OBD-I guide covers the rest.
What does Ford code 27 mean?
Vehicle speed sensor signal fault on 2.3L turbo models
Common causes of 27
- Faulty vehicle speed sensor
- Open or shorted sensor wiring
- Corroded connector
- Faulty speedometer or speed interface module
- PCM input circuit fault
How to fix 27
- Confirm the code and check whether the speedometer works
- Inspect the sensor connector and wiring for corrosion and opens
- Test the speed sensor signal while rolling
- Repair wiring or a faulty interface module before replacing the sensor
- Replace the sensor only after the signal test fails
Source
Source review recorded
Sources and review
Review: checked against the recorded source material.
- EEC-IV Ford trouble code table (MIL, description, type)
archived reference page (troublecodes.net via Wayback Machine)
Supports: code identity and meaning
Fetched directly. Code row matches the description used in the data file.
https://web.archive.org/web/20030720231430id_/http://www.troublecodes.net:80/Ford/eec-iv.shtml
Last updated 2026-09-25.
Report a correction for 27. Include your vehicle, the issue and a source if you have one.