P2051 Fault Code

Reductant Injector Circuit Low Bank 2 Unit 1

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

The P2051 fault code indicates a problem with the reductant injector circuit for Bank 2, Unit 1. This injector is responsible for injecting diesel exhaust fluid (DEF) into the exhaust system to help reduce emissions. When there is a low signal in the circuit, it can affect the performance of the emissions control system.

What are the symptoms of the P2051 code?

Common symptoms associated with the P2051 code may include:

• Check Engine Light illuminated on the dashboard
• Reduced engine power or performance
• Increased emissions levels
• Possible odor of diesel exhaust fluid
• Warning messages regarding the DEF system on the vehicle's display.

What causes the P2051 code?

Possible causes of the P2051 fault code include:

• Faulty reductant injector on Bank 2
• Electrical issues such as short circuits or open circuits in the wiring harness
• Failed or damaged connectors that affect the injector's operation
• Issues with the Engine Control Module (ECM) affecting the injector's operation
• Contaminated diesel exhaust fluid
• Low DEF levels in the tank.

How to fix P2051?

To resolve the P2051 fault code, consider the following steps:

• Diagnose the exact cause using a scan tool and detailed vehicle data
• Inspect the wiring and connectors associated with the reductant injector for short circuits or breaks
• Replace any damaged components or wiring
• Test the reductant injector to ensure it operates correctly and replace it if necessary
• Verify that the diesel exhaust fluid is clean and at the correct level
• Clear the fault code and perform a road test to ensure the issue is resolved.