Reference meaning
What does this code mean?
The wording below belongs to the named make and communication. Match the complete code, reporting module, model year and engine before applying it.
A code identifies a detected condition, not a part that must automatically be replaced.
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A listed vehicle is a research lead. Confirm the engine, production range and software in the manufacturer's information.
Before replacing a part
Record codes and freeze-frame data. Check battery condition, related codes and visible wiring or hose damage. Follow the vehicle's diagnostic procedure and test results before replacing parts.
Scan worksheet →Manufacturer communications
13Original wording in English
FORD, LINCOLN, MERCURY
INOPERATIVE OR INACURRATE SPEEDOMETER, 4X4 LAMP ILLUMINATD, AND / OR DIAGNOSTIC TROUBLE CODE P1635 OR P1639. *TT
MAZDA
SOME VEHICLES MAY EXHIBIT INOPERATIVE OR INACCURATE SPEEDOMETER, 4X4 LAMP ILLUMINATION, AND / OR DIAGNOSTIC TROUBLE CODES P1635 AND / OR P1639, P0602 PRESENT AFTER POWER TRAIN CONTROL MODULE (PCM) OR INSTRUMENT CLUSTER REPLACEMENT. *TT
FORD
INOPERATIVE OR INACCURATE SPEEDOMETER, 4X4 LAMP ILLUMINATED, AND / OR DIAGNOSTIC TROUBLE CODE P1635 OR P1639 PRESENT AFTER POWERTRAIN CONTROL MODULE (PCM) OR INSTRUMENT CLUSTER REPLACEMENT. 1999-2002 VARIOUS FORD VEHICLES. *TT
FORD, LINCOLN
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
Check vehicle applicability
59A listed vehicle is a research lead. Confirm the engine, production range and software in the manufacturer's information.
| Make | Model | Model year |
|---|---|---|
| Buick | RAINIER ↗ | 2004 |
| Chevrolet | TRAILBLAZER ↗ | 2004 |
| Chevrolet | TRAILBLAZER ↗ | 2003 |
| Chevrolet | TRAILBLAZER ↗ | 2002 |
| Ford | E SERIES ↗ | 2002 |
| Ford | E SERIES ↗ | 2001 |
| Ford | E SERIES ↗ | 2000 |
| Ford | ECONOLINE ↗ | 2000 |
Code meaning and manufacturer information
Original wording in English · Historical directory labels; manufacturer applicability has not been established for every entry.
Tire / Axle Ratio Out of Acceptable Range
Can I keep driving?
A code alone cannot establish whether driving is safe. A flashing malfunction light, severe shaking, overheating, oil-pressure warning or loss of braking or steering needs prompt attention. Stop in a safe place and seek assistance when control or engine safety is affected. Follow the vehicle handbook.