Ford 657 Transmission over temperature condition

How to read it

Code 657 reads as 6 flashes, pause, 5 flashes, pause, 7 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 657 mean?

Transmission over temperature condition

Common causes of 657

• Low automatic transmission fluid level
• A restricted or clogged transmission cooler
• Towing beyond the rated limit that overheats the fluid
• Worn clutch packs that slip and build heat
• A failed transmission fluid temperature sensor

How to fix 657

1. Check the transmission fluid level and condition
2. Check the transmission cooler for restriction or blockage
3. Check for slip under load that builds heat
4. Test the TFT sensor and replace it only if it fails its own test
5. Test the PCM last, only after every circuit test has passed
6. Clear the code, then retest to confirm the fix holds

Source

Qualified source review