620 Torque converter clutch excessive clutch slip
How to read it
Code 620 reads as 6 flashes, pause, 2 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 620 mean?
620. Torque converter clutch excessive clutch slip. This code sets when your vehicle computer detects torque converter clutch excessive clutch slip.
Common causes of 620
- Faulty torque converter clutch
- Open or shorted wiring in the torque converter clutch circuit
- Corroded or loose connector at the torque converter clutch
- Low or dirty transmission fluid
- Faulty PCM transmission control
How to fix 620
- Confirm the code and check the transmission fluid level and condition
- Inspect the torque converter clutch and its wiring for damage and corrosion
- Test the torque converter clutch circuit
- Service the fluid before condemning internal parts
- Replace a failed part only after the circuit test fails