Reductant Pressure Sensor - Above Normal
The reductant pressure sensor is reporting an excessively high pressure.
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What it means (plain English)
The system is designed to inject urea into the exhaust, but the sensor is detecting too much pressure in the line. This pressure should normally be around 5-10 psi, and anything above 15 psi indicates a problem.
What the computer is actually seeing
The ECM sees a voltage signal from the reductant pressure sensor that’s higher than expected, usually above 4.5 volts.
What a healthy reading looks like
Normal sensor voltage should be between 0.5 to 4.5 volts, corresponding to a pressure of 5-10 psi in the reductant delivery line.
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 connectors of the reductant pressure sensor for any damage or corrosion. If damaged, repair or replace as needed.
- 22. Inspect the reductant delivery line for blockages. Clean or replace as necessary. Confirm there are no kinks or bends limiting flow.
- 33. Use a scan tool to monitor the voltage from the reductant pressure sensor. If above 4.5 volts, replace the sensor and retest.
- 44. If the sensor is replaced and the issue persists, test the reductant pump and valves for correct operation. Confirm they are providing appropriate pressure.
Common causes
- Faulty reductant pressure sensor
- Blocked reductant line
- Faulty pumps or valves in the reductant system
- Wiring issues or short circuits to the sensor
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's advisable to address this issue soon, as unresolved problems may impact emissions and performance.
Will this code come back after repair?
If repaired correctly, it shouldn't return unless there's another underlying issue.
Why does this code pair with others?
Often, faults in the reductant system can lead to multiple codes, indicating related sensor or component failures.
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