Reductant Injector Range/Performance Problem
Fault in the reductant injection system for diesel exhaust fluid (DEF).
Heads up: this code wasn't in our hand-written library yet, so DiagCoach AI built this page on the fly. Double-check critical specs against service info before condemning parts.
What it means (plain English)
The computer is indicating there's an issue with how the engine is injecting diesel exhaust fluid, which is necessary for reducing emissions.
What the computer is actually seeing
The engine control module (ECM) monitors the reductant injector's performance by checking the injection rates and comparing them with expected values based on driving conditions.
What a healthy reading looks like
The injector should deliver DEF at a specific rate, usually around 30 mL/min at idle and up to 200 mL/min during heavy load conditions.
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 level in the tank. It should be above the minimum level. If low, fill it up and clear the code.
- 22. Inspect the wiring and connectors to the reductant injector and pump for damage or corrosion. Repair as necessary.
- 33. Test the reductant injector by applying power directly to it and observing if it operates. If it does not function, replace the injector.
- 44. Check the pressure and flow rate of the DEF pump using a scan tool or pressure gauge; it should meet manufacturer specifications.
Common causes
- Clogged reductant injector
- Defective reductant pump
- Low diesel exhaust fluid level
- Wiring issues or poor connections in the DEF system
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's safe to drive short distances, but you will experience increased emissions and reduced performance. Get it fixed soon.
Will this code come back after clearing?
If the underlying issue isn't resolved, the code will likely return.
Why does it pair with other emission codes?
Emission codes are often interlinked, meaning a failure in one component can trigger multiple codes due to their interconnected functions.
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