Applicable Systems
OBD-II
Symptoms
VSS signal loss; speedometer may not work; transmission may not shift correctly; ABS may be affected.
Possible Causes
- VSS sensor internal failure
- Sensor wiring open/short
- VSS gear/drive tang damaged
- ABS wheel speed sensor fault (if VSS derived from ABS)
Troubleshooting Steps
- Step 1: Check VSS signal at ECM with scanner
Speed reading matches actual vehicle speed - Step 2: Inspect VSS sensor at transmission
Sensor mounted correctly - Step 3: Check VSS resistance
Resistance within spec - Step 4: Inspect VSS drive gear/tang
Gear/tang intact - Step 5: Replace VSS sensor if faulty
Speedometer and shifting normal
How to Reset
Clear with OBD-II scanner after repair; verify speedometer and shifting.
Common Replacement Parts
- Vehicle Speed Sensor (OEM spec)
Frequently Asked Questions
- Q: Can bad VSS cause transmission problems?
Yes. Transmission control module uses VSS for shift timing. Without VSS, transmission may stay in limp mode (2nd or 3rd gear only).
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Source: SAE J2012 standard DTC list + OBD-II portal
Category: OBD-II
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