Low Dosing Module Output
The Dosing Control Module is not providing the expected output for DEF injection.
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What it means (plain English)
The system that adds diesel exhaust fluid (DEF) isn't working right, meaning your engine might not be treating exhaust properly and could fail emissions tests.
What the computer is actually seeing
The engine management computer expects a specific output signal from the Dosing Control Module corresponding to how much DEF should be injected based on current engine conditions, measured in milliliters per injection.
What a healthy reading looks like
Dosing output signal should range from 0.5 to 1.5 volts depending on the load and engine speed; higher loads require more DEF.
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 DEF level in the tank. Ensure it's above the minimum required level (typically around 2.5 gallons).
- 22. Inspect wiring and connectors to the Dosing Control Module for signs of damage, corrosion, or loose connections.
- 33. Measure the voltage output from the Dosing Control Module while the engine is running; it should be between 0.5 and 1.5 volts. If not, the module may be faulty.
- 44. Test the DEF injector to ensure it's not clogged. This can sometimes be done with a hot water flush if accessible.
- 55. If all outputs test normal, check for DTCs related to the ECU and ensure there's no programming or software issues. If all steps are clear, consider replacing the Dosing Control Module.
Common causes
- Faulty Dosing Control Module
- Wiring issue between the module and the engine control unit (ECU)
- Blocked DEF injector or low DEF levels
- Module calibration issue
Typical repair cost
$$
Related codes
Frequently asked questions
Can I still drive my vehicle with this code?
Yes, but it's not recommended to drive long distances as emissions may be impacted.
Will the code come back after I fix it?
If the underlying issue is solved, the code should stay cleared; otherwise, it may return.
Why does this code show up with other codes like SPN 1713?
These codes are related to the DEF system, indicating that multiple components may be having issues.
Working a real vehicle right now?
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