How do I fix Ford code 659?

Test the TR sensor/PNP switch 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

659 High vehicle speed in park indicated

Q: What does Ford code 659 mean?

Ford code 659. High vehicle speed in park indicated. Applies to 1981-1995 Ford, Lincoln and Mercury EEC-IV vehicles.

Make: Ford (1981-1995)
Category: Powertrain - Transmission
Severity: Check Engine Light
Applies to: 1981-1995 Ford, Lincoln and Mercury EEC-IV vehicles

How to read it

Code 659 reads as 6 flashes, pause, 5 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 659 mean?

659. High vehicle speed in park indicated. This code sets when your vehicle computer detects high vehicle speed in park indicated.

Common causes of 659

TR sensor/PNP switch
ECM

How to fix 659

Test the TR sensor/PNP switch 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