Reductant Pressure Sensor Performance
The reductant pressure sensor is reading out of the expected range.
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What it means (plain English)
The pressure sensor that checks the fluid used in the exhaust system to lower emissions isn't working right, which can cause engine issues.
What the computer is actually seeing
The engine control module (ECM) expects a voltage signal from the reductant pressure sensor that typically ranges from 0.5 to 4.5 volts corresponding to a fluid pressure of 1 to 10 PSI. Deviations from this range trigger the code.
What a healthy reading looks like
Reductant pressure should be between 1 to 10 PSI; sensor signal between 0.5 to 4.5 volts.
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 reductant fluid level. Ensure it's between the minimum and maximum marks. If it's low, refill and reset the code.
- 22. Inspect the wiring and connectors to the reductant pressure sensor. Look for any frays, corrosion, or loose connections that could cause signal interruptions.
- 33. Test the voltage signal at the sensor connector. With the ignition on (engine off), voltmeter should read between 0.5 and 4.5 volts. If out of range, replace the sensor.
- 44. If the sensor voltage is okay, check the exhaust aftertreatment system for blockages or abnormal conditions that might affect pressure readings.
Common causes
- Faulty reductant pressure sensor
- Wiring issues or damaged connectors
- Low reductant fluid level
- Blocked exhaust aftertreatment system
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's better to address this issue soon; it can affect emissions and lead to more severe problems.
Will this code come back after clearing it?
Yes, if the underlying issue isn't resolved, the code will likely return.
Why is this code paired with other codes?
Other codes may indicate related issues, like problems in the exhaust aftertreatment system or with the injector performance.
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