Aftertreatment 1 SCR System Pressure Sensor Circuit High
Pressure sensor in the SCR system is reporting a high value.
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What it means (plain English)
The pressure sensor monitors how much exhaust enters the SCR system. If it reads too high, it might mean there's a blockage or the sensor is faulty.
What the computer is actually seeing
The engine control module (ECM) detects a voltage output from the pressure sensor that exceeds its maximum threshold (typically around 5 volts).
What a healthy reading looks like
The SCR system pressure should be between 0.5 to 2.5 volts under normal operating conditions.
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 wiring and connector to the SCR pressure sensor for damage or corrosion.
- 22. Inspect the exhaust aftertreatment system for blockages or restrictions.
- 33. Use a scan tool to read live data from the SCR pressure sensor and confirm if the voltage is indeed above 5 volts.
- 44. If the voltage is high, inspect the sensor itself and replace if defective.
- 55. Clear the fault codes and test drive the vehicle to see if the code returns.
Common causes
- Blocked exhaust aftertreatment system
- Faulty pressure sensor
- Wiring issues in the sensor circuit
- Exhaust leaks
- Incorrect installation of aftertreatment components
Typical repair cost
$$$
Related codes
Frequently asked questions
Can I drive my vehicle with this code?
It's not recommended to drive long distances as it can lead to further issues with the emissions system.
Will the code come back after I clear it?
If the underlying issue is not resolved, yes, the code will return.
Why does this code appear with other emissions-related codes?
These codes often result from interconnected systems within the aftertreatment setup.
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