EGR Pressure Differential Sensor Voltage High
Indicates high voltage from the EGR pressure differential sensor.
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What it means (plain English)
The EGR pressure differential sensor measures the pressure difference across the EGR system. If you see a high voltage reading, it means the sensor might be spotting too much pressure or there's a fault in the wiring or sensor.
What the computer is actually seeing
The ECM reads the voltage from the EGR pressure differential sensor which should be within a certain range—typically between 0.5 to 4.5 volts. High voltage readings (above 4.5 volts) indicate a problem.
What a healthy reading looks like
0.5 - 4.5 volts for normal operation, anything over 4.5 volts is concerning.
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 the EGR pressure differential sensor connector and wiring for damage or corrosion.
- 22. Measure the voltage at the sensor connector with the key on/engine off; it should be 0.5 to 4.5 volts.
- 33. If the voltage is above 4.5 volts, check for a short to the power supply in the wiring.
- 44. If wiring checks out, replace the EGR pressure differential sensor and clear the code, then test drive to see if it returns.
Common causes
- Faulty EGR pressure differential sensor
- Wiring issues or short circuits in the sensor circuit
- Clogged EGR passages
- Faulty engine control module (ECM)
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
Moderate severity means you should fix it soon, as it could impact emissions.
Will this code come back after clearing it?
If there's an underlying issue with the sensor or wiring, yes, it will likely return.
Why does this code pair with SPN 1804?
SPN 1804 indicates a low voltage from the sensor, which can happen when there's an issue causing erratic readings.
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