Fuel Tank Pressure Sensor Circuit
There's a problem with the fuel tank pressure sensor's circuit.
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 fuel tank pressure sensor measures the vapor pressure in the fuel tank. If it sees too high a pressure, it thinks there is a leak or a malfunction, which can affect fuel delivery and emissions.
What the computer is actually seeing
The ECU monitors the voltage signal from the fuel tank pressure sensor. Normally, a proper reading will be between 0.1V (at atmospheric pressure) and 4.5V (indicating a high vacuum).
What a healthy reading looks like
A good fuel tank pressure reading is typically around 1-3V with the engine off and can fluctuate between 0.5V and 4.5V during normal operation based on changes in pressure.
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 wiring and connectors for damage or corrosion. Repair if needed. Decision: Are they okay? Yes: Go to step 2. No: Repair wiring/connectors.
- 22. Inspect the fuel filler cap for proper sealing. Replace if damaged. Decision: Is the cap good? Yes: Go to step 3. No: Replace cap and test.
- 33. Test the fuel tank pressure sensor with a multimeter. At key-on engine-off, voltage should read close to atmospheric (around 1-3V). Decision: Is the voltage within range? Yes: Go to step 4. No: Replace the sensor.
- 44. Check the evaporative emissions system for any leaks or malfunctions. Perform a smoke test if necessary. Decision: Are there leaks? Yes: Repair leaks. No: Go to step 5.
- 55. Clear the fault codes, drive the vehicle through a drive cycle, and monitor for reoccurrence. Decision: Is the code back? Yes: Possible ECU issue. No: Repair successful.
Common causes
- Faulty fuel tank pressure sensor
- Wiring or connector issues
- Evaporative emissions system leaks
- Faulty fuel filler cap or seal
- ECU issues
Typical repair cost
$$
Related codes
Frequently asked questions
Can I drive with this code active?
Yes, but it may affect emissions and fuel efficiency. Fix it soon.
Will the issue come back after I clear the code?
It might if the underlying issue isn't fixed; keep monitoring.
Why does this code pair with other SPNs?
Related codes often indicate issues within the same system, like leaks in the evaporative emissions system.
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