P2052 Fault Code

Reductant Injector Circuit High Bank 2 Unit 1

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

The P2052 fault code indicates an issue with the reductant injector circuit on Bank 2, specifically for Unit 1. This part of the emissions control system is responsible for injecting a reductant agent, typically diesel exhaust fluid (DEF), into the exhaust stream to reduce nitrogen oxide (NOx) emissions. A malfunctioning injector can lead to increased emissions and may cause the vehicle to fail emissions testing.

What are the symptoms of the P2052 code?

Common symptoms associated with the P2052 fault code may include:

• Illuminated Check Engine Light on the dashboard.
• Reduced engine power or efficiency.
• Error codes related to the emissions system may also be present.
• Possible vehicle limp mode activation to prevent further damage or emissions violations.

What causes the P2052 code?

There are several potential causes for the P2052 code, including:

• A short circuit or open circuit in the wiring harness associated with the reductant injector.
• A failure in the reductant injector itself.
• Issues with the Engine Control Module (ECM) not properly controlling the injector.
• An accumulation of DEF crystals due to leaks or evaporation, affecting the injector's operation.

How to fix P2052?

To resolve the P2052 fault code, the following steps should be taken:

• Inspect the wiring and connectors related to the reductant injector for any signs of damage, corrosion, or loose connections. Repair or replace as necessary.
• Test the reductant injector to check if it is functioning correctly. If it is faulty, replace it with a new unit.
• Clear the fault codes and perform a road test to ensure that the code does not return.
• If the issue persists, further diagnostic testing may be required to assess the ECM or related components.