690 Gear shift 3-4 malfunction
How to read it
Code 690 reads as 6 flashes, pause, 9 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 690 mean?
690. Gear shift 3-4 malfunction. This code sets when your vehicle computer detects gear shift 3-4 malfunction.
Common causes of 690
- ATF level/condition
- Poor connection
- Wiring
- TR sensor
- Clutch slipping
- ECM
How to fix 690
- Check the transmission fluid level and condition, and look for slip under load
- Check the connector pins for corrosion, spread terminals or a poor fit
- Check the circuit wiring and harness for damage, chafing or a poor splice
- Test the TR 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