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.
New to flash codes? The OBD-I code reading guide walks through the paperclip method, code 12, and reading two-digit codes.
What does Ford code 657 mean?
657. Transmission over temperature condition. This code sets when your vehicle computer detects transmission over temperature condition.
Common causes of 657
- Faulty transmission cooling system
- Open or shorted wiring in the transmission cooling system circuit
- Corroded or loose connector at the transmission cooling system
- Low or dirty transmission fluid
- Faulty PCM transmission control
How to fix 657
- Confirm the code and check the transmission fluid level and condition
- Inspect the transmission cooling system and its wiring for damage and corrosion
- Test the transmission cooling system circuit
- Service the fluid before condemning internal parts
- Replace a failed part only after the circuit test fails