Here's why:
* VSS Function: The VSS is a crucial component that measures the rotational speed of the transmission or driveshaft. This information is used by several systems:
* Speedometer/Odometer: Provides the speed and mileage readings.
* ABS: The Anti-lock Braking System uses the VSS to determine wheel speed for proper ABS operation. Without it, the ABS system defaults to "off" and illuminates the warning light.
* Transmission Control Module (TCM) / Powertrain Control Module (PCM): These modules use the VSS input for various functions, including shifting, fuel injection timing, and more. A malfunction can trigger the Check Engine light.
* Common Causes of VSS Failure: The sensor itself can fail, the wiring to the sensor can be damaged or corroded, or the sensor's gear within the transmission can be stripped or broken.
What to do:
1. Check the fuses: Make sure the fuses related to the ABS and instrument cluster are intact. Your owner's manual will show the fuse box layout.
2. Have the codes read: A mechanic can use an OBD-II scanner to read the trouble codes from the PCM. This will pinpoint the exact problem. The codes might point directly to the VSS or indicate a related issue.
3. Inspect the VSS: The location varies slightly depending on the transmission type, but the VSS is typically found on the transmission case. A mechanic can visually inspect it for damage or corrosion and check the wiring.
4. Repair/Replacement: If the VSS is faulty, it will need to be replaced. Replacing the VSS is usually a relatively straightforward repair for a mechanic, but accessing it may require some mechanical knowledge.
Important Note: While driving with a faulty VSS might not immediately cause a safety hazard, it significantly limits the functionality of critical safety systems (ABS) and provides inaccurate information (speedometer). It's advisable to have this problem diagnosed and repaired as soon as possible. Ignoring it could lead to further problems and possibly compromise safety, particularly during braking.
Don't ignore the Check Engine and ABS lights. Get it professionally diagnosed to avoid further complications.
