OBD-II Generic Error Code P2059: How to Fix It

Q: What does error code P2059 mean?

P2059 means the engine control module (ECM) detected a high voltage condition in the reductant injector circuit for bank 1 unit 2. This is often due to a wiring fault, defective injector, or DEF system issue.

Q: Can I drive with error code P2059?

You may still be able to drive, but the vehicle may enter limp mode, reduce power, or increase emissions. Prolonged driving without repair could damage the DEF system or catalytic converter.

Q: How do I fix error code P2059?

Start by inspecting wiring and connectors. Then test the reductant injector resistance with a multimeter. Check DEF level and quality. If needed, replace the injector or repair wiring. Clear the code and test drive.

Q: What tools do I need to fix P2059?

You'll need an OBD2 scanner, multimeter, basic hand tools (socket set, pliers), and safety glasses. Professional scan tools may be required for advanced diagnostics.

Q: Is error code P2059 serious?

It is a medium-severity code. While it may not cause immediate breakdown, it can lead to increased emissions and reduced engine performance. It's best to address it promptly to avoid further damage.

Abstract

Error code P2059 indicates a high voltage condition in the reductant injector circuit for bank 1 unit 2. This is part of the diesel exhaust fluid (DEF) injection system, which reduces NOx emissions. A malfunction can cause reduced engine performance and increased emissions.