What it means
The SCR system has reached an inducement stage that requires engine shutdown under its strategy. The code identifies the shutdown inducement state; it does not by itself establish that the reductant tank is empty or prescribe a restart procedure.
At a glance
- Usually lights the check-engine light
- Affects emissions; the car can fail an emissions test
How it works
Selective catalytic reduction (SCR) uses reductant, commonly diesel exhaust fluid, to reduce nitrogen oxide emissions. This code indicates that the SCR system has reached a control-module inducement stage that calls for engine shutdown under the vehicle's strategy; it does not identify the underlying SCR fault.
Common causes
Most likely first.
- SCR emissions fault triggering inducement
- Reductant system fault or inadequate reductant
- SCR sensor or wiring fault
Symptoms
- Check engine light or SCR warning may be on
- Engine shutdown or restart restriction
How to diagnose it
- Read all stored and pending SCR codes and freeze-frame data to identify the fault that triggered the shutdown inducement.
- Check the instrument-panel messages and the vehicle's owner information for the stated shutdown status and any applicable restart restrictions.
- Check reductant level and condition using the vehicle's specified method, and inspect the tank area for obvious leakage or damage.
- Inspect accessible SCR sensors, connectors, and wiring for disconnection, corrosion, heat damage, or chafing that could cause misleading system readings.
- Use a scan tool to review SCR sensor data and system tests, then test the implicated reductant components and circuits against the manufacturer's specifications.
Common fixes
- Correct an inadequate or contaminated reductant supply using the vehicle's specified fluid and filling procedure.
- Repair damaged or poorly connected SCR sensor wiring or connectors.
- Replace a failed SCR sensor or reductant-system component when diagnostic testing identifies it.
- Repair the underlying SCR emissions fault and verify that the inducement clears using the vehicle's specified service procedure.
Can I keep driving?
Treat the shutdown or restart restriction warning as urgent: reach a safe stopping place before the stated restriction takes effect, and do not assume the engine will restart. Follow the vehicle's instructions, since the code alone does not establish a restart procedure.
A code shows where the control module detected a fault, not always which part failed. Check the causes in order and confirm with a test before replacing parts. Have several codes? Check them together
This is a generic code: it means the same on every make. The car’s maker may add more detail in its own service information.