Reductant Pressure Sensor Range/Performance Problem
The reductant pressure sensor is reporting a pressure reading outside its expected range.
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What it means (plain English)
The system that injects the urea solution (DEF) into the exhaust has a sensor that measures the pressure of that fluid. If the pressure is too low or too high, the computer will set this code.
What the computer is actually seeing
The ECM monitors the voltage signal from the reductant pressure sensor. It expects a signal that corresponds to a specific pressure range, typically around 1.5 to 4.5 volts, representing 5 to 15 psi. If it sees values outside this range consistently, it triggers the P2041 code.
What a healthy reading looks like
Reductant pressure should be between 5 and 15 psi while the engine is running. The sensor should output a voltage between 1.5V (low pressure) and 4.5V (high pressure).
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 connectors to the reductant pressure sensor for damage or corrosion. Repair as needed. Decision: Is the wiring intact? Yes = go to step 2; No = repair wiring and retest.
- 22. Check the level and quality of the DEF in the tank. DEF should be clear and free of contamination. Decision: Is DEF good? Yes = go to step 3; No = drain and replace DEF and retest.
- 33. Use a scan tool to monitor the voltage output of the reductant pressure sensor during engine operation. Decision: Is the output voltage within expected range (1.5V to 4.5V)? Yes = go to step 4; No = replace the sensor and retest.
- 44. Check for restrictions in the DEF line or pump operation. Inspect for kinks or blockages. Decision: Is there a blockage? Yes = clear blockage and retest; No = replace the reductant pressure sensor.
Common causes
- Faulty reductant pressure sensor
- Wiring issues or short to ground
- Blocked or restricted DEF line
- Low DEF level or contaminated DEF
- Faulty DEF pump
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's not advisable to drive long distances as it may affect emissions, and you could enter limp mode.
Will this code come back after repair?
If the root cause is properly resolved, the code should not return.
Why does this code sometimes pair with P2002 or P207F?
Those codes are related to the EGR or SCR system, which can be impacted if the DEF system is not functioning properly.
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