Evaporative Emission System Pressure Sensor Circuit High Voltage
Pressure sensor in the evaporative emission control system is reporting high voltage.
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What it means (plain English)
The pressure sensor that's supposed to measure fuel vapor pressure in the emissions system is showing a voltage that's too high, likely over 5 volts.
What the computer is actually seeing
The engine control module (ECM) sees a voltage reading from the pressure sensor that exceeds its normal operating range, which is generally from 0.5V to 4.5V.
What a healthy reading looks like
0.5V to 4.5V is normal; anything over 4.5V suggests an issue.
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 all wiring and connectors to the pressure sensor for damage or corrosion. Repair any issues found.
- 22. With the key on, engine off, measure the voltage at the pressure sensor connector. Confirm it does not exceed 4.5V. If it does, trace the circuit for shorts to voltage.
- 33. Disconnect the pressure sensor and measure the resistance across the sensor terminals. It should be within the specified range (typically 2-10 kΩ). Replace if out of range.
- 44. If the sensor is good, check for vacuum leaks in the lines leading to the evaporative system. Repair any leaks found.
- 55. If all components check out and the issue persists, consider testing or replacing the ECM.
Common causes
- Faulty pressure sensor
- Wiring short to voltage
- Corroded connectors
- Faulty ECM
- Damaged vacuum lines
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's drivable, but emissions may increase. Fix soon to avoid potential fines and further damage.
Will the code come back after repairs?
If the issue is genuinely fixed, it shouldn't return. Monitor the system for further errors.
Why might this code appear alongside other codes?
Multiple codes can indicate a common fault in the system or cascading failures where one issue causes another.
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