# P1639 on the 2000 Ford Expedition

The bulletins listed name this code in NHTSA's summary, or are about the same components. A bulletin or a recall listed here may apply to the model year. None of it is a diagnosis.

This code is specific to a manufacturer and is not described here.

## Bulletins for this model year that name P1639

- [636052](https://open.wenmarpro.com/bulletins/636052), 2002-11-04: INOPERATIVE OR INACURRATE SPEEDOMETER, 4X4 LAMP ILLUMINATD, AND / OR DIAGNOSTIC TROUBLE CODE P1635 OR P1639. \*TT
- [620269](https://open.wenmarpro.com/bulletins/620269), 2001-07-23: INOPERATIVE OR INACCURATE SPEEDOMETER AS WELL AS 4X4 LIGHT INOPERATIVE AND / OR DIAGNOSTIC TROUBLE CODE P1635 AND / OR P1639 AFTER A POWERTRAIN CONTROL MODULE \(PCM\) HAS BEEN REPLACED. \*TT
- [618529](https://open.wenmarpro.com/bulletins/618529), 2001-04-16: INOPERATIVE OR INACCURATE SPEEDOMETER, 4X4 LAMP ILLUMINATED AND / OR DIAGNOSTIC TROUBLE CODES \(DTCS\) P1635 OR P1639 PRESENT AFTER A POWERTRAIN CONTROL MODULE \(PCM\) OR INSTRUMENT CLUSTER REPLACEMENT. \*JB