Manufacturer Specific - SCR Fault
Indicates a fault with the Selective Catalytic Reduction system.
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 SCR system, which uses urea to reduce emissions, has detected a problem, likely leading to increased emissions or limp mode.
What the computer is actually seeing
The engine control unit (ECU) sees a fault in the SCR system, like low urea pressure or incorrect urea quality.
What a healthy reading looks like
UREA Pressure: 2.5 - 4.5 bar, UREA Quality: 30-34% concentration
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 urea level in the tank. Should be above the minimum mark. If low, fill the tank and clear the code. If not low, proceed to step 2.
- 22. Inspect urea pump and its operation. Test voltage and ground to the pump. Expected voltage is 12V. If not present, check wiring and connections. If good, replace the pump. Proceed to step 3.
- 33. Check for blockages in the SCR injector. Remove and clean the injector if needed. Re-test system. If still present, go to step 4.
- 44. Test SCR control module for proper operation. Use a scan tool to check for additional codes and commands. If module fails, replace it.
Common causes
- Low urea level in tank
- Faulty urea pump
- Blocked SCR injector
- Faulty SCR module
- Wiring issues or bad connectors
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
No, it's likely in limp mode, limiting performance and increasing emissions.
Will this code come back after clearing?
Yes, if the underlying issue isn't fixed, it will return.
Why is this paired with other codes?
Other codes often indicate related issues in the emissions system.
Working a real vehicle right now?
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