Total Fuel Flow Rate - Invalid Data
The ECM has detected an issue with the fuel flow rate reading.
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 engine control module (ECM) is getting bad data about how much fuel is flowing, which could affect engine performance.
What the computer is actually seeing
The ECM expects a fuel flow rate that typically remains constant during operation, usually between 0.5 to 5.0 L/h based on demand. When it sees values outside the expected range or fluctuating erratically, it sets this code.
What a healthy reading looks like
Expected fuel flow should be between 0.5 L/h and 5.0 L/h 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.
- 11. Check the fuel level; ensure it's above 1/4 tank to avoid issues. Decision: If low, add fuel and retest.
- 22. Inspect wiring and connectors to the fuel flow sensor for damage or loose connections. Decision: If damaged, repair or replace.
- 33. Measure voltage at the fuel flow sensor. You should see around 5 volts from the ECM. Decision: If no voltage is present, investigate ECM or wiring issues.
- 44. Using diagnostic equipment, check live data for fuel flow rate while the engine runs. Decision: If the flow rate is significantly outside of expected range, suspect a faulty sensor or contamination in the system.
- 55. If the sensor appears fine, check for fuel contamination or blockage in filters and lines.
Common causes
- Dirty or clogged fuel flow sensor
- Wiring issues to the fuel flow sensor
- Faulty ECM program or calibration
- Fuel system contamination
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with this code present?
It's moderate severity; the vehicle may still be drivable but could experience performance issues. Fix it soon.
Will this code return after clearing it?
If the underlying issue isn't fixed, the code will likely return.
Why is this code paired with other SPN codes?
It often indicates a systemic fuel delivery issue, which can trigger multiple related codes.
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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