OBD-II Generic Error Code P2055: How to Fix It

Q: What does error code P2055 mean?

It means the PCM detected a high voltage condition in the reductant injector circuit for Bank 2, Unit 1. This is part of the DEF injection system used to reduce emissions.

Q: Can I drive with a P2055 code?

It is not recommended. The vehicle may enter limp mode, and prolonged driving can damage the SCR system or increase emissions.

Q: What causes a P2055 code?

Common causes include a faulty reductant injector, damaged wiring or connectors, contaminated DEF fluid, or a failing ECM.

Q: How do I fix a P2055 code?

Start by inspecting the injector wiring and connector for damage. Test the injector resistance and replace if out of spec. Also check DEF fluid level and quality.

Q: How much does it cost to fix P2055?

Costs vary: a multimeter is about $20, an OBD2 scanner $30-100, a new injector $100-300, and labor if professional $100-200 per hour.

Abstract

Error code P2055 means your vehicle's engine control module (ECM) detected a high voltage in the reductant injector circuit for Bank 2 Unit 1. This component is part of the Selective Catalytic Reduction (SCR) system in diesel vehicles, which injects diesel exhaust fluid (DEF) to reduce NOx emissions. A faulty injector, wiring issue, or ECM problem can trigger this code.