OBD-I Codes List

Ford 626 Converter clutch solenoid circuit failure KOEO

Make
Ford (1981-1995)
Category
Powertrain - Transmission
Severity
Check Engine Light

How to read it

Code 626 reads as 6 flashes, pause, 2 flashes, pause, 6 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 626 mean?

Converter clutch solenoid circuit failure KOEO

Common causes of 626

  • An open or short in the converter clutch solenoid circuit
  • A failed transmission coast clutch solenoid
  • A poor connection at the transmission connector for the coast clutch
  • An internal fault in the PCM coast clutch driver

How to fix 626

  1. Check the converter clutch solenoid circuit wiring for an open or short
  2. Check the transmission connector pins for the coast clutch for corrosion or a poor fit
  3. Test the transmission coast clutch solenoid and replace it only if it fails its own test
  4. Test the PCM last, only after every circuit test has passed
  5. Clear the code, then retest to confirm the fix holds

Source

Qualified source review

Sources and review

Review: qualified. Read the source limits below.

  • EEC-IV Ford trouble code table (MIL, description, type)

    archived reference page (troublecodes.net via Wayback Machine)

    Supports: code identity and meaning

    Fetched directly. The three-digit row matches the description used in the data file.

    https://web.archive.org/web/20030720231430id_/http://www.troublecodes.net:80/Ford/eec-iv.shtml

  • Ford EEC-IV trouble code table: code, fault location, probable cause (Crown Victoria, Mustang, Taurus, Thunderbird 1992-1995)

    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/crown-victoria-mustang-cobralxgt-taurus-thunderbird-1992-1995/

Last updated 2026-10-10.

Report a correction for 626. Include your vehicle, the issue and a source if you have one.

Related Powertrain - Transmission Codes