Reductant Purge Control Valve A Circuit High

Where it lives

For P20A3, the circuit described runs through the valve. The description of P20A3 reports a fault at the valve.

Check these first

• A shorted reductant purge valve A control circuit
• A short to voltage in the purge valve wiring
• A failed purge valve A solenoid
• Crystallized DEF jamming the purge valve

What to do next

1. Inspect the purge valve A wiring for shorts to voltage
2. Measure the valve solenoid resistance against a known-good value
3. Check the connector for corrosion and pushed pins
4. Command the purge valve with a scan tool and listen for it
5. Inspect the valve for DEF crystallization
6. Replace the valve if the circuit tests good

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