Aftertreatment Fuel Pump Performance
This code indicates a performance issue with the aftertreatment fuel pump.
Heads up: this code wasn't in our hand-written library yet, so DiagCoach AI built this page on the fly. Double-check critical specs against service info before condemning parts.
What it means (plain English)
The aftertreatment fuel pump isn't supplying the right amount of fuel needed for the emissions system to work efficiently. This can result in poor emissions control and potential damage to the aftertreatment system.
What the computer is actually seeing
The engine control unit (ECU) monitors the fuel pump's operation through input signals, measuring pressure and flow rates. If the fuel flow is below a set threshold (typically around 0.5 to 1.5 gallons per hour), a fault is detected.
What a healthy reading looks like
Fuel pump output should be between 300-600 PSI under normal operating conditions.
Guided diagnostic — the DiagCoach way
Don't just throw parts at it. Walk through these in order — each step tells you whether to keep going or stop and fix what you found.
- 1Check for any visible damage to wiring and connectors related to the aftertreatment fuel pump. Ensure there are no loose connections.
- 2Inspect the fuel filter for clogs or restrictions; replace if necessary. If it's restricted, check for additional issues in the fuel system.
- 3Test the aftertreatment fuel pump operation using a scan tool to ensure it's providing the correct pressure and flow. Compare the reading to expected values (300-600 PSI).
- 4If the fuel pump operates outside expected parameters, replace the pump. If within parameters, further inspect for any restrictions in the fuel lines or tank.
Common causes
- Clogged fuel filter
- Faulty aftertreatment fuel pump
- Electrical issues (wiring/connectors)
- Blocked fuel lines or tank issues
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code active?
It can be drivable, but expect reduced performance and increased emissions; fix as soon as possible.
Will this code come back if I clear it?
If the underlying issue isn't fixed, it will likely return after a short drive cycle.
What happens if the aftertreatment pump fails completely?
If it fails, expect significant emissions issues, potential no-start condition, and possible damage to the aftertreatment system.
Working a real vehicle right now?
Let DiagCoach walk you through it live with your specific symptoms, vehicle, and what you've already checked.
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