Reductant Injection Air Pressure Control Valve Performance

Where it lives

For P20A7, the part to look at first is the valve named here.

Check these first

• A reductant injection air pressure control valve that will not reach commanded pressure
• A control valve stuck partway
• A restriction in the reductant injection air supply
• A failed reductant injection air pressure control valve

What to do next

1. Command the reductant injection air pressure control valve with a scan tool
2. Compare actual air pressure to the commanded value
3. Check the reductant injection air supply for a restriction
4. Verify control valve travel against command
5. Replace the reductant injection air pressure control valve if it will not respond
6. Clear the code and retest

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