P2055 Fault Code

Reductant Injector Circuit High Bank 1 Unit 2

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

The P2055 fault code indicates an issue with the reductant injector circuit for Bank 1 Unit 2. This component is vital for controlling the flow of the diesel exhaust fluid (DEF), which helps reduce emissions by converting harmful nitrogen oxides into harmless nitrogen and water. When the circuit is reported as 'high', it typically suggests that there is an electrical issue, such as a short circuit or a failure within the injector itself.

What are the symptoms of the P2055 code?

Drivers may notice symptoms such as:

• Check Engine light illuminated on the dashboard
• Reduced engine performance and power
• Increased emissions or failing an emissions test
• Possible engine hesitation or stalling in some cases

What causes the P2055 code?

Common causes for the P2055 code can include:

• Faulty reductant injector
• Damaged or corroded wiring or connectors in the circuit
• Bad engine control module (ECM)
• Poor grounding or electrical connections
• Defective sensors that monitor the injector circuit

How to fix P2055?

To resolve the P2055 fault code, consider the following steps:

1. Inspect the wiring and connectors related to the reductant injector for damage, corrosion, or loose connections.
2. Test the reductant injector for proper operation and if faulty, replace it with a new unit.
3. Check the engine control module for diagnostic trouble codes and perform any necessary reprogramming or updates.
4. Clear the fault codes and perform a test drive to verify the issue is resolved.