Code result
P0503
Vehicle Speed Sensor Intermittent/Erratic/High
Moderate severity
What it means
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.
Is it safe to drive?
Use caution
The vehicle is usually drivable for short distances, but the problem can worsen or affect emissions. Diagnose and repair as soon as practical.
Most likely causes
Noise on signal line or intermittent open
highOne of the most commonly reported causes for this code — check this first.
Reluctor ring damaged or missing teeth
mediumA plausible cause — test and verify before replacing parts.
Connector with intermittent contact under vibration
lowLess common, but worth ruling out after the more likely causes.
Related help
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