Engine Protection - Consumption Threshold Exceeded
This code indicates that the engine's fuel consumption exceeds expected levels.
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 is using more fuel than it should, which can point to inefficiencies or problems in the fuel system.
What the computer is actually seeing
The Engine Control Module (ECM) monitors fuel consumption based on inputs from fuel flow sensors and compares them to the engine's performance parameters. When it detects that fuel consumption exceeds a pre-defined threshold, it triggers this fault.
What a healthy reading looks like
Typical fuel consumption rates should not exceed manufacturer specifications, usually around 0.4 to 0.5 liters per hour per horsepower under standard 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. Inspect wiring and connectors for the fuel flow sensor for damage or corrosion. Repair as needed. Decision: Is the wiring intact? If yes, proceed; if no, fix wiring.
- 22. Check fuel flow sensor readings with a multimeter or scan tool. Ensure it’s within specification (typically 0.5V to 4.5V at known fuel flow rates). Decision: Is the reading normal? If yes, proceed; if no, replace sensor and retest.
- 33. Inspect fuel lines and injectors for leaks. Look for signs of fuel pooling or high-pressure loss. Decision: Are there any leaks? If yes, repair leaks; if no, proceed.
- 44. Monitor the engine's actual fuel consumption against the expected value during operation. Use a scan tool for real-time data. Decision: Is consumption normal? If yes, further diagnosis on the ECM may be required; if no, investigate tuning and performance issues.
Common causes
- Faulty fuel flow sensor
- Leaking fuel lines or injectors
- Inaccurate measurement due to ECM issues
- Exhaust system blockages
- Incorrect engine tuning or settings
Typical repair cost
$$-$$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's moderately serious; driving is possible but may lead to poor efficiency and increased emissions.
Will this fault code come back after clearing?
If underlying issues aren't fixed, the code will likely return soon after clearing.
Why does this code often pair with SPN 560?
SPN 560 indicates low fuel flow; both codes point to common issues in the fuel delivery system.
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