Ford 99 Electronic pressure control circuit failure or idle not learned

How to read it

Code 99 reads as 9 flashes, 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.

What does Ford code 99 mean?

Electronic pressure control circuit failure or idle not learned

Common causes of 99

• The base idle was adjusted and the ECM did not relearn the idle.
• The idle tracking switch is misadjusted or not reporting.
• The electronic pressure control (EPC) circuit in the transmission is open or damaged.
• The PCM cannot command the electronic pressure control solenoid.

How to fix 99

1. Check the base idle setting and the idle tracking switch.
2. Relearn the base idle and confirm the ECM stores the learned value.
3. Check the electronic pressure control circuit and its connector at the transmission.
4. Test the electronic pressure control solenoid and replace it only if it fails its own test.
5. Test the ECM last, only after every circuit test has passed.
6. Clear the code, then retest to confirm idle learns and the EPC circuit works.

Source

Source review recorded