89 Converter clutch override circuit failure or exhaust heat control fault
How to read it
Code 89 reads as 8 flashes, pause, 9 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 89 mean?
89. Converter clutch override circuit failure or exhaust heat control fault. This code sets when your vehicle computer detects converter clutch override circuit failure or exhaust heat control fault.
Common causes of 89
- Wiring
- TCC lock - up solenoid
- ECM
How to fix 89
- Check the circuit wiring and harness for damage, chafing or a poor splice
- Test the TCC lock - up solenoid 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