EPA 2010/2013 SCR Diesel Exhaust Fluid Pressure Sensor Circuit
Issues with the Diesel Exhaust Fluid pressure sensor circuit.
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What it means (plain English)
The diesel exhaust fluid (DEF) pressure sensor is sending out bad readings or is disconnected, affecting how your system treats emissions.
What the computer is actually seeing
The ECM detects that the DEF pressure readings are outside of a normal operating range which should be between 5 to 10 psi during operation.
What a healthy reading looks like
DEF pressure should read between 5 to 10 psi in normal operation; less than 1 psi indicates low fluid or a fault.
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 DEF fluid level; it should be above the minimum mark. If low, fill it up and check if the fault clears.
- 22. Inspect the wiring and connectors for damage, corrosion, or loose connections; repair as necessary. Then recheck the code.
- 33. Test the DEF pressure sensor with a multimeter; check that it outputs between 0.5V to 4.5V when the fluid pressure varies from total absence to pressure. If it fails, replace the sensor.
Common causes
- Wiring issue between the sensor and ECM
- Faulty DEF pressure sensor
- Low DEF fluid level
- Connector problem at the sensor or ECM
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's drivable, but emissions may be affected and can lead to reduced engine performance.
Will this code return after clearing?
If the underlying issue isn’t fixed, yes, the code will likely come back.
Why does this code relate to other SPNs?
They all pertain to different aspects of the SCR system and DEF pressure readings.
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