P2053 Fault Code

Reductant Injector Circuit/Open Bank 1 Unit 2

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

The P2053 fault code indicates a problem with the reductant injector circuit or an open circuit on Bank 1 Unit 2. The reductant injector is responsible for injecting diesel exhaust fluid (DEF) into the exhaust stream to reduce emissions. When this circuit is malfunctioning, it can lead to increased emissions and may trigger the check engine light.

What are the symptoms of the P2053 code?

Drivers may notice:

• Check engine light illuminated on the dashboard.
• Reduced engine performance or power.
• Increased emissions during an emissions test.
• Possible warnings related to diesel exhaust fluid levels or quality.

These symptoms indicate that the diesel exhaust fluid system is not functioning properly.

What causes the P2053 code?

Common causes for the P2053 code include:

• Open or shorted circuits in the injector harness.
• Faulty reductant injector.
• Defective Engine Control Module (ECM).
• Poor connections or corroded connectors.
• Low levels of diesel exhaust fluid (DEF).

It is essential to diagnose the issue accurately to prevent unnecessary repairs.

How to fix P2053?

To resolve the P2053 code, consider the following steps:

• Inspect the wiring harness for any signs of damage, fraying, or corrosion and repair as necessary.
• Test the reductant injector for functionality and replace if found defective.
• Check and refill the diesel exhaust fluid if it is low or contaminated.
• Clear the fault codes after repairs and conduct a test drive to ensure the issue is resolved.

If the problem persists, further diagnostic testing may be required to check the ECM and its connections.