Evaporative Emission Control System Pressure Sensor Low Voltage
Indicates low voltage at the EVAP system pressure sensor.
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What it means (plain English)
The EVAP pressure sensor is supposed to read a certain voltage level to monitor fuel vapor leaks. Low voltage here means the sensor isn't working properly, which can cause emissions issues.
What the computer is actually seeing
The engine control module (ECM) is expecting a voltage signal between 0.5V to 4.5V from the pressure sensor based on fuel tank pressure changes. If it sees a voltage below 0.1V consistently, it triggers this code.
What a healthy reading looks like
Normal voltage range is 0.5V to 4.5V. Below 0.1V indicates a fault.
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 all wiring and connectors for damage or corrosion related to the EVAP pressure sensor; repair as necessary. - Decision: Are any issues found? (Yes: Fix wiring; No: Proceed to next step)
- 22. Check vacuum and pressure at the fuel tank; ensure the venting is not blocked. - Decision: Is it blocked? (Yes: Clear blockage; No: Proceed to next step)
- 33. Use a multimeter to measure voltage at the EVAP pressure sensor; expect 0.5V to 4.5V. - Decision: Is the voltage within the normal range? (Yes: Sensor is likely faulty; Replace sensor; No: Check wiring continuity to ECM)
- 44. If sensor replaced, clear codes and perform a drive cycle to verify if the code returns. - Decision: Does the code reappear? (Yes: Recheck previous steps; No: Repair successful)
Common causes
- Faulty EVAP pressure sensor
- Wiring issues or broken connectors
- Excessive fuel tank pressure due to blocked vent lines
Typical repair cost
$$
Related codes
Frequently asked questions
Can I still drive with this code?
Yes, but expect potential emissions issues. Fixing it soon is advisable.
Will this issue come back after clearing the code?
If the underlying issue isn't fixed, it may return after driving.
Does this code relate to fuel efficiency?
Indirectly, as a failing EVAP system can affect fuel vapor recovery, leading to increased emissions.
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