Ford 70 EEC IV data transaxle circuit failed
How to read it
Code 70 reads as 7 flashes, pause, 0 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 70 mean?
EEC IV data transaxle circuit failed
Common causes of 70
- Open or shorted transaxle data circuit
- Faulty transaxle control module
- Corroded connector
- Internal transmission fault
- PCM communication fault
How to fix 70
- Confirm the code and inspect the transaxle data circuit wiring
- Check the transaxle control module connector for corrosion
- Test the data circuit for continuity and shorts
- Repair wiring before replacing the module
- Replace the module only after the circuit 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 70. Include your vehicle, the issue and a source if you have one.