P2058 Fault Code

Reductant Injector Circuit High Bank 2 Unit 2

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

The P2058 fault code indicates an issue with the reductant injector circuit for Bank 2, specifically Unit 2. This fault commonly arises in diesel vehicles equipped with selective catalytic reduction (SCR) systems that use a urea solution, commonly known as diesel exhaust fluid (DEF). The reductant injector is responsible for injecting this fluid into the exhaust stream to reduce emissions. When the circuit is detected to be high, it typically signifies an electrical issue, such as a short to voltage or a fault within the injector itself.

What are the symptoms of the P2058 code?

Symptoms associated with a P2058 code may include:

• Illuminated check engine light on the dashboard.
• Poor engine performance or reduced power output.
• Increased emissions output, potentially failing an emissions test.
• Warning messages or indicators related to the emissions control system.
• Unusual sounds or clicking from the injector area.

What causes the P2058 code?

Several factors may lead to a P2058 code, including:

• A short circuit in the wiring harness connected to the reductant injector.
• A defective reductant injector that is drawing too much current.
• Faulty electrical connections or corroded connectors that alter the signal.
• A malfunctioning engine control module (ECM) that misreads the injector's operation.
• Issues within the SCR system, such as blocked injectors or poor DEF quality.

How to fix P2058?

To resolve the P2058 fault code, follow these steps:

• Inspect the wiring and connectors for signs of damage, corrosion, or shorts. Repair or replace as necessary.
• Test the reductant injector to determine if it is functioning correctly. If it is faulty, replace the injector.
• Clear the fault code using an OBD-II scanner and perform a test drive to ensure the code does not return.
• If the issue persists, inspect the ECM and perform a reprogramming if necessary.
• Consider checking the DEF quality and ensure that it meets OEM specifications.