P2057 Fault Code

Reductant Injector Circuit Low Bank 2 Unit 2

• What does that mean?
• Symptoms
• Causes
• Solutions

The P2057 fault code indicates an issue with the reductant injector circuit for Bank 2, specifically Unit 2. This component is crucial for the operation of the selective catalytic reduction (SCR) system, which helps reduce harmful emissions in diesel engines by injecting a urea solution into the exhaust stream. When the circuit is low, it can affect the efficiency of the SCR system, leading to increased emissions and potential engine performance issues.

What are the symptoms of the P2057 code?

Common symptoms associated with a P2057 fault code may include:

• Decreased engine performance
• Increased exhaust emissions
• Warning lights on the dashboard, often including the check engine light
• Possible limp mode activation, reducing vehicle power as a safety measure
• An audible warning indicating low reductant levels.

What causes the P2057 code?

There are several potential causes for a P2057 error code, including:

• A malfunctioning reductant injector on Bank 2, Unit 2
• Damaged wiring or connectors in the injector circuit
• A problem with the Engine Control Module (ECM) that could affect the injector's performance
• A blown fuse associated with the reductant system
• Low levels of the reductant (urea solution) in the tank.

How to fix P2057?

To resolve the P2057 fault code, consider the following steps:

1. Inspect and test the reductant injector on Bank 2, Unit 2 for functionality.
2. Check the wiring and connectors for any signs of damage, corrosion, or loose connections.
3. Replace any damaged components as needed, including the injector or wiring.
4. Ensure the reductant tank is filled with the appropriate urea solution.
5. Clear the fault code with a diagnostic scanner and test drive the vehicle to ensure the issue is resolved.