OBD-I Codes List

Ford 63 Throttle position sensor circuit below minimum voltage

Make
Ford (1981-1995)
Category
Powertrain - Fuel/Air Metering
Severity
Check Engine Light

How to read it

Code 63 reads as 6 flashes, pause, 3 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 63 mean?

Throttle position sensor circuit below minimum voltage

Common causes of 63

  • The TP sensor signal falls below minimum voltage.
  • The TP sensor circuit is open or shorted to ground.
  • The TP sensor winding failed and reads low.
  • The ECM reads the throttle position signal below minimum.

How to fix 63

  1. Check that the TP sensor is mounted tight on the throttle body.
  2. Check the TP sensor circuit for an open or a short to ground.
  3. Test the TP sensor with a meter through its full travel and replace it only if it fails.
  4. Test the ECM last, only after every circuit test has passed.
  5. Clear the code, then retest to confirm the voltage rises into range.

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

  • Ford EEC-IV trouble codes, Crown Victoria, Mustang, Taurus, Thunderbird 1992-1995 (code, fault location, 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 additional probable causes.

    https://web.archive.org/web/20160502051413id_/http://www.troublecodes.net:80/ford/crown-victoria-mustang-cobralxgt-taurus-thunderbird-1992-1995/

  • 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 63. Include your vehicle, the issue and a source if you have one.

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