381 Erratic A/C compressor clutch cycling
How to read it
Code 381 reads as 3 flashes, pause, 8 flashes, pause, 1 flash 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 381 mean?
381. Erratic A/C compressor clutch cycling. This code sets when your vehicle computer detects erratic a/c compressor clutch cycling.
Common causes of 381
- A/C system incorrectly charged
- Cycling switch defective
- A/C circuit fault
- Wiring intermittent open circuit to A/C system
- ECM
How to fix 381
- Check the A/C charge and the pressure switch
- Test the cycling switch and replace it only if it fails its own test
- Check for A/C circuit fault
- Check the circuit wiring for an open circuit
- Test the ECM last, only after every circuit test has passed
- Clear the code, then retest to confirm the fix holds