Engine Error
P0503
Vehicle Speed Sensor Intermittent/Erratic/High
Severity
High
Symptoms
Speedometer needle jumps wildly, transmission drops out of overdrive randomly
Common Causes
- Loose connection at VSS
- Damaged wiring shorting to voltage
- Faulty VSS internally
- Failing alternator causing voltage spikes
How to Fix
- 1 Secure VSS plug
- 2 Repair damaged wiring harness
- 3 Replace Vehicle Speed Sensor
- 4 Test alternator output voltage
Estimated Repair Cost
USD
$50
–
$400
VSS Replacement: $100 - $250; Alternator test: $50