P0458
PowertrainEvap Systemlow severityEvaporative Emission System Vent Valve Control Circuit Low
What P0458 Means
The PCM detected low voltage in the EVAP purge or vent valve control circuit. This is often a wiring short to ground or a failed valve.
Symptoms
- Check engine light on
- Possible rough idle
- Failed emissions test
Common Causes
- Short to ground in control circuit
- Faulty EVAP purge/vent valve
- Corroded connector
- Open PCM driver circuit
Diagnostic Steps
- Inspect valve connector and wiring
- Measure valve resistance against spec
- Check control circuit for short to ground
- Replace valve if out of spec
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✓ Autel official store
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