Reductant System Performance Bank 2
The P205F code indicates a performance issue with the reductant (DEF) injection system on Bank 2 of the engine. This typically means the system is not injecting the correct amount of diesel exhaust fluid, which can lead to increased NOx emissions and potential damage to the SCR catalyst. The issue may be caused by a faulty DEF injector, pump, or sensor, or by contamination or crystallization of the DEF fluid.
01. Most Common Causes
- Faulty DEF injector on Bank 2
- DEF pump malfunction
- DEF quality or contamination issues
- Wiring or connector problems in the reductant system
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Reduced engine performance or power
- Increased exhaust emissions
- Possible limp mode activation
03. Step-by-Step Diagnosis
Step 1: Scan for additional codes and check freeze frame data.
Step 2: Inspect DEF level and quality; test for contamination.
Step 3: Visually inspect DEF injector, pump, and lines for leaks or damage.
Step 4: Use a scan tool to perform a reductant system test and monitor DEF flow.
Step 5: Check wiring and connectors for corrosion or damage.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive for extended periods as it can lead to increased emissions and potential damage to the SCR system. The vehicle may enter limp mode, reducing performance.
How much does it cost to fix?▼
The cost typically ranges from $150 to $600, depending on the root cause. Replacing a DEF injector or pump can be more expensive, while cleaning or replacing DEF fluid is cheaper.