29 Insufficient input from the speedometer module or vehicle speed sensor
How to read it
Code 29 reads as 2 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 29 mean?
29. Insufficient input from the speedometer module or vehicle speed sensor. This code sets when your vehicle computer detects insufficient input from the speedometer module or vehicle speed sensor.
Common causes of 29
- Faulty programmable speedometer odometer module
- Faulty vehicle speed sensor
- Open or shorted speed signal wiring
- Corroded connector
- Faulty speed interface module
How to fix 29
- Confirm the code and check the speedometer for correct operation
- Inspect the speed signal wiring and connectors for damage and corrosion
- Test for a speed signal at the PCM while rolling
- Repair wiring or the interface module before replacing the sensor
- Replace a failed module only after the signal test fails