Vehicle Speed Sensor A Circuit Low
The primary vehicle speed sensor (VSS A) reports a signal voltage below the plausible lower limit. With no usable speed signal the ECU loses cruise control, gear-shift logic and certain anti-stall functions.
Affected components
- Vehicle speed sensor a
- Vss wiring
Common causes
- High likelihood: Signal shorted to ground
- Medium likelihood: Sensor internal short
- Low likelihood: Connector pins corroded - high contact resistance
Diagnostic notes
- The malfunction indicator lamp may illuminate
Related codes
Sources
Diagnostic information is provided for reference only. Confirm the code with a compatible scan tool and follow the vehicle manufacturer's service procedures before replacing components.