47 Four wheel drive switch closed during self test or measured air flow low at base idle
How to read it
Code 47 reads as 4 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 47 mean?
47. Four wheel drive switch closed during self test or measured air flow low at base idle. This code sets when your vehicle computer detects four wheel drive switch closed during self test or measured air flow low at base idle.
Common causes of 47
- Wiring short circuit
- Four wheel drive selector switch
- Internal damage to transfer case
- ECM
How to fix 47
- Check the circuit wiring and harness for damage, chafing or a poor splice
- Test the four wheel drive selector switch and replace it only if it fails its own test
- Check for internal damage to transfer case
- Test the ECM last, only after every circuit test has passed
- Clear the code, then retest to confirm the fix holds