Ford 670 Transmission range sensor voltage high or low
How to read it
Code 670 reads as 6 flashes, pause, 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 670 mean?
Transmission range sensor voltage high or low
Common causes of 670
- A transmission range sensor that is out of adjustment
- An open or short in the transmission range sensor circuit
- A failed transmission range sensor
- An internal fault in the PCM range input
How to fix 670
- Check the transmission range sensor adjustment and the shift linkage
- Check the range sensor circuit wiring for an open or short
- Test the transmission range sensor and replace it only if it fails its own test
- Test the PCM last, only after every circuit test has passed
- Clear the code, then retest to confirm the fix holds
Source
Qualified source review
Sources and review
Review: qualified. Read the source limits below.
- Ford trouble codes, Contour, Escort, Mustang, Probe, Taurus and Tempo 1992-1995 (code, description, probable cause)
archived reference page (troublecodes.net via Wayback Machine)
Supports: code identity and probable causes
Independent table on the same archive site with matching code identity and a probable cause column.
http://web.archive.org/web/20160501223306id_/http://www.troublecodes.net:80/ford/contour-escort-mustang-probe-taurus-tempo-1992-1995/
- Ford EEC-IV trouble code table: code, fault location, probable cause (Aerostar, Bronco, Econoline, Explorer, F-Series, Ranger 1992-1997)
reference page (troublecodes.net)
Supports: per-code probable causes used for the page cause list and test order
Fetched 2026-09-30. The probable cause column is what the page lists, in source order, with the test order built from it.
https://www.troublecodes.net/ford/aerostar-vanwagon-bronco-econolineclub-wagon-explorer-f-series-ranger-1992-1997/
Last updated 2026-10-10.
Report a correction for 670. Include your vehicle, the issue and a source if you have one.