31 EGR valve position or pressure feedback circuit below minimum voltage
How to read it
Code 31 reads as 3 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 31 mean?
31. EGR valve position or pressure feedback circuit below minimum voltage. This code sets when your vehicle computer detects egr valve position or pressure feedback circuit below minimum voltage.
Common causes of 31
- Wiring short circuit to ground
- EGR valve/position sensor
- ECM
How to fix 31
- Check the circuit wiring for a short to ground
- Test the EGR valve/position 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