Exhaust Gas Pressure Sensor Circuit High
The exhaust gas pressure sensor signal is too high.
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What it means (plain English)
The exhaust gas pressure sensor measures the pressure in the exhaust system. If it reports too high a pressure, it could mean there's a blockage or a bad sensor.
What the computer is actually seeing
The ECM reads a voltage or signal from the exhaust gas pressure sensor that is higher than the expected range, typically over 4.5V or a corresponding pressure that exceeds normal operating conditions.
What a healthy reading looks like
Normal voltage from the exhaust gas pressure sensor should range between 0.5V to 4.5V, corresponding to pressures of 0 to 30 psi in a typical system.
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 the wiring and connector for the exhaust gas pressure sensor. Look for frays or corrosion. If damaged, repair or replace it; if not, go to step 2.
- 22. Check the exhaust gas pressure sensor itself. Use a multimeter to test the output voltage while the engine is running. If voltage is above 4.5V or does not change with RPM, replace the sensor; if normal, go to step 3.
- 33. Inspect the exhaust system for restrictions. Look for collapsed pipes or clogged filters. Clear any blockages; if all clear, go to step 4.
- 44. Recheck for the code after repairs. If still present, further diagnose the ECM or consult repair manual for extensive troubleshooting.
Common causes
- Blocked exhaust system
- Faulty exhaust gas pressure sensor
- Wiring issues (short or open circuits)
- Exhaust leaks downstream of the sensor
Typical repair cost
$$ - $$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's better to address it soon since high exhaust pressure can lead to exhaust system damage.
Will this code come back after clearing?
If the underlying issue isn't fixed, yes, it will likely return.
Why does this code sometimes pair with SPN 3983?
Both codes indicate problems related to exhaust gas pressure, often stemming from common issues within the exhaust system.
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