Reductant Pump Supply Voltage Circuit Stuck On

Where it lives

For P05F1, the circuit described runs through the pump. The description of P05F1 reports a fault at the pump.

Check these first

• A short to voltage in the reductant pump supply
• A stuck reductant pump relay
• A failed reductant pump
• A corroded pump connector
• A control module output stuck on

What to do next

1. Measure the reductant pump supply voltage
2. Test the supply circuit for a short to voltage
3. Check the pump relay
4. Inspect the pump connector for corrosion
5. Replace the pump if the supply stays on with the key off
6. Clear the code and retest

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