Vehicle Speed Sensor A Circuit Intermittent Erratic or High
Same as P0502 with the signal noisy, erratic or above the plausible upper limit - typical for a chafed harness, missing reluctor tooth or a sensor with a weakened magnet.
Affected components
- Vehicle speed sensor a
- Vss wiring
- Reluctor ring
Common causes
- High likelihood: Noise on signal line or intermittent open
- Medium likelihood: Reluctor ring damaged or missing teeth
- Low likelihood: Connector with intermittent contact under vibration
Diagnostic notes
- The malfunction indicator lamp may illuminate
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.