Ford 656 Torque converter clutch slippage error

How to read it

Code 656 reads as 6 flashes, pause, 5 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.

What does Ford code 656 mean?

Torque converter clutch slippage error

Common causes of 656

• A torque converter clutch that slips more than the PCM expects
• Low or worn fluid that weakens the TCC apply pressure
• A worn or glazed TCC facing
• An internal fault in the PCM TCC control

How to fix 656

1. Check the transmission fluid level and condition, and watch for TCC slip under load
2. Check for slipping under steady light throttle with the clutch locked
3. Test the torque converter clutch 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

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