Fuel Injector Pump Mechanical Fault
The fuel injector pump is experiencing a mechanical issue.
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)
Inside the fuel injector pump, components like gears and bearings are failing or not working properly, causing inconsistent fuel delivery to the engine. This might show up as low or no fuel pressure.
What the computer is actually seeing
The engine control module (ECM) monitors fuel pump pressure and flow rates. If the pressure falls below a threshold (typically around 30-50 psi), or there's an unexpected increase in pump current draw, the ECM triggers this fault code.
What a healthy reading looks like
Expected fuel pressure is between 30-70 psi at the injector pump outlet.
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.
- 11. Check fuel level in the tank. If low, fill and retest. Decision: If fuel level is adequate, continue. If not, this could be the issue.
- 22. Inspect wiring and connectors to the fuel pump for damage or corrosion. Repair if necessary. Decision: If wiring is good, proceed. If damaged, repair and retest.
- 33. Test fuel pressure at the injector pump outlet with a gauge. Expected pressure is 30-70 psi. Decision: If pressure is within spec, continue. If low or no pressure, replace the pump.
- 44. Check for clogged fuel filters; replace if dirty. Decision: If the filter is clean, proceed. If clogged, replace filter and retest.
- 55. If all checks are good but the code persists, consider replacing the fuel injector pump.
Common causes
- Worn fuel pump components
- Clogged fuel filters
- Low fuel levels affecting pump operation
- Electrical issues in the pump circuit
- Faulty ECM calculations/settings
Typical repair cost
$$$
Related codes
Frequently asked questions
Can I drive with this code?
You can drive, but expect performance issues and possible stalling, so fix soon.
Will this code return?
If the mechanical issue isn't resolved, yes, the code will reappear.
Why does this code sometimes pair with SPN 1947?
Both codes indicate issues with the fuel pump; SPN 1947 often relates to electrical failures.
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