OBD-I Codes List

Ford 19 PCM internal voltage fault or cylinder identification sensor input failure

Make
Ford (1981-1995)
Category
Powertrain - Computer and Auxiliary Controls
Severity
Check Engine Light

How to read it

Code 19 reads as 1 flash, pause, 9 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 19 mean?

PCM internal voltage fault or cylinder identification sensor input failure

Common causes of 19

  • Internal PCM voltage fault
  • Faulty cylinder identification sensor on some models
  • Damaged cylinder identification wiring
  • Low or unstable system voltage
  • PCM connector corrosion

How to fix 19

  1. Confirm the code and check for other stored codes
  2. Check battery and charging voltage and the PCM grounds
  3. Inspect the cylinder identification sensor wiring where fitted
  4. Repair poor power or ground connections before replacing the PCM
  5. Replace the PCM only if the internal voltage fault returns with good power and grounds

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/

Last updated 2026-09-25.

Report a correction for 19. Include your vehicle, the issue and a source if you have one.

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