High Pressure Fuel Pump Fuel Temperature Sensor Circuit High
The fuel temperature sensor signal is too high for proper function.
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What it means (plain English)
The fuel temperature sensor is reading a temperature that's too high, which might indicate overheating or sensor failure.
What the computer is actually seeing
The engine control module (ECM) sees the fuel temperature reading from the sensor way above normal operational values, often exceeding 180°F (82°C).
What a healthy reading looks like
The fuel temperature should typically be between 140°F (60°C) and 180°F (82°C) during normal operation.
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 the fuel temperature sensor wiring for damage or corrosion. Repair or replace as needed. Decision point: Are any repairs needed? If yes, fix the wiring and retest.
- 2Inspect the fuel temperature sensor. If it's damaged, replace it. Decision point: Is the sensor reading normal after replacement? If yes, the issue is resolved.
- 3Examine fuel system for signs of overheating or excessive pressure. Use a fuel pressure gauge to measure actual pressure. Decision point: Is the pressure within normal range? If no, further diagnose the fuel system or pump.
- 4Confirm that the fuel being used is clean and appropriate for the system specifications. Decision point: Is the fuel contaminated? If yes, replace the fuel and check system for damage.
Common causes
- Faulty fuel temperature sensor
- Wiring issues or damaged connectors
- Contaminated fuel causing overheating
- Excessive fuel pump pressure
- Engine overheating leading to high fuel temperature
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
Moderate severity suggests you should not ignore it. It may affect overall engine performance, so fix it soon.
Will this code come back after clearing?
If the underlying issue isn't resolved, yes, it likely will return.
Why does this code pair with SPN 5278?
Both codes relate to fuel temperature issues; one might indicate a sensor fault while the other can show overheating conditions.
Working a real vehicle right now?
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