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Standard Ignition SC684 Vehicle Speed Sensor
| Brand | Standard Ignition SC684 |
|---|---|
| Connector Gender | Female |
| Connector Shape | Rectangular |
| Connector Type | Plug In |
| Mounting Location | On Transimission |
| Mounting Type | Bolt Mount |
| Terminal Gender | Male |
| Terminal Type | Blade |
| Fits | Volkswagen and Audi · 25 vehicles |
Plug-in connector. Simplifies installation with a rectangular female connector and bolt-mount design.
Blade terminals. Uses two male blade terminals for a secure electrical connection.
Vehicle speed sensor. Measures transmission speed for accurate signal output.
Cross-references Standard Ignition SC684, 01V927321A and SN8386 for the same application. See all 5.
Vehicle Speed Sensor for Transmission Control
Standard Ignition SC684 is a vehicle speed sensor built for transmission-mounted applications that report speed data to the transmission control module. It uses a rectangular plug-in connector with a female connector body, male blade terminals, and a bolt-mount design for a direct electrical and mechanical interface.
Compatible with select Audi A4, A4 Quattro, A8 Quattro, RS6, S6, S8, and Volkswagen Phaeton applications, this Standard Ignition SC684 speed sensor supports accurate transmission speed signal input for drivability and control-system operation.
Key Features
- Vehicle speed sensor for transmission control module applications
- Mounts on the transmission with a bolt-mount design
- Rectangular plug-in connector for straightforward electrical connection
- Female connector with male blade terminals
- Single-connector, 2-terminal configuration
- Standard Ignition SC684 replacement part number
Detailed Description
The Standard Ignition SC684 is a transmission-mounted vehicle speed sensor used to provide speed information to the transmission control module. Its connector and terminal layout are designed for the specified OE-style electrical interface, helping maintain consistent signal transfer in supported Audi and Volkswagen applications. If you are replacing a faulty speed sensor on an Audi A4, Audi A4 Quattro, or Volkswagen Phaeton, SC684 is a direct-fit service part for the listed transmission-control applications.
This part cross-references 01V927321A and SN8386 for the same application.
What It Helps Fix
- Erratic or inaccurate vehicle speed readings
- Transmission control module speed-signal faults
- Harsh or inconsistent shifting related to speed input loss
- Speedometer operation issues caused by a failed transmission sensor
- Diagnostic trouble codes tied to transmission speed signal performance
Installation Notes and Tips
- Install on the transmission at the original sensor location.
- Verify the connector shape, terminal style, and mounting style before installation.
- Inspect the harness connector for corrosion, bent terminals, or damaged locking tabs.
- Confirm the vehicle application by year, make, model, and transmission-control notes before ordering.
- Use the listed fitment details for Audi A4, A4 Quattro, A8 Quattro, RS6, S6, S8, and Volkswagen Phaeton applications only.
Quality Assurance
Standard Ignition is a recognized aftermarket brand for electrical and engine management components. SC684 is built to match the specified connector, terminal, and mounting requirements for the listed applications.
- Fits 2004-2006 Volkswagen Phaeton, For Transmission Control Module.
- Fits 1997-2003 Audi A8 Quattro, For Transmission Control Module.
- Fits 2003 Audi RS6, For Transmission Control Module.
- Fits 2001-2003 Audi S8, For Transmission Control Module.
- Fits 2002 Audi S6, For Transmission Control Module.
- Fits 1999-2001 Audi A4, w/o Wire; Located in Transmission.
- Fits 1999-2001 Audi A4 Quattro, w/o Wire; Located in Transmission.
- Fits 1997-1998 Audi A4, Located in Transmission.
- Fits 1996-1997 Audi A4 Quattro, Located in Transmission.
| Year | Make | Model | Drive Type | Transmission | Position | Notes |
|---|---|---|---|---|---|---|
| 2006 | Volkswagen | Phaeton | — | — | N/A | For Transmission Control Module. |
| 2005 | Volkswagen | Phaeton | — | — | N/A | For Transmission Control Module. |
| 2004 | Volkswagen | Phaeton | — | — | N/A | For Transmission Control Module. |
| 2003 | Audi | A8 Quattro | AWD | — | N/A | For Transmission Control Module. |
| 2003 | Audi | RS6 | — | — | N/A | For Transmission Control Module. |
| 2003 | Audi | S8 | — | — | N/A | For Transmission Control Module. |
| 2002 | Audi | A8 Quattro | AWD | — | N/A | For Transmission Control Module. |
| 2002 | Audi | S6 | — | — | N/A | For Transmission Control Module. |
| 2002 | Audi | S8 | — | — | N/A | For Transmission Control Module. |
| 2001 | Audi | A4 | — | Automatic | N/A | w/o Wire; Located in Transmission |
| 2001 | Audi | A4 Quattro | — | Automatic | N/A | w/o Wire; Located in Transmission |
| 2001 | Audi | A8 Quattro | AWD | — | N/A | For Transmission Control Module. |
| 2001 | Audi | S8 | — | — | N/A | For Transmission Control Module. |
| 2000 | Audi | A4 | — | Automatic | N/A | w/o Wire; Located in Transmission |
| 2000 | Audi | A4 Quattro | — | Automatic | N/A | w/o Wire; Located in Transmission |
| 2000 | Audi | A8 Quattro | AWD | — | N/A | For Transmission Control Module. |
| 1999 | Audi | A4 | — | Automatic | N/A | w/o Wire; Located in Transmission |
| 1999 | Audi | A4 Quattro | — | Automatic | N/A | w/o Wire; Located in Transmission |
| 1999 | Audi | A8 Quattro | AWD | — | N/A | For Transmission Control Module. |
| 1998 | Audi | A4 | FWD | Automatic | N/A | Located in Transmission |
| 1998 | Audi | A8 Quattro | AWD | — | N/A | For Transmission Control Module. |
| 1997 | Audi | A4 | — | Automatic | N/A | Located in Transmission |
| 1997 | Audi | A4 Quattro | — | Automatic | N/A | Located in Transmission |
| 1997 | Audi | A8 Quattro | AWD | — | N/A | For Transmission Control Module. |
| 1996 | Audi | A4 Quattro | — | Automatic | N/A | Located in Transmission |
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