680 Automatic transmission fluid temperature high
How to read it
Code 680 reads as 6 flashes, pause, 8 flashes, pause, 0 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 680 mean?
680. Automatic transmission fluid temperature high. This code sets when your vehicle computer detects automatic transmission fluid temperature high.
Common causes of 680
- ATF level
- Transmission cooling system
- Towing weight limit exceeded
- Clutch slipping
- Wiring
- TFT sensor
- ECM
How to fix 680
- Check the transmission fluid level and condition, and look for slip under load
- Check the cooling system: level, thermostat and circulation
- Check the circuit wiring and harness for damage, chafing or a poor splice
- Test the TFT sensor and replace it only if it fails its own test
- Test the ECM last, only after every circuit test has passed
- Clear the code, then retest to confirm the fix holds