OBD-II Generic Error Code P2058: Reductant Injector Circuit B1U2 Low - How to Fix It

Q: Can I drive my car with error code P2058?

You can drive short distances, but the vehicle may enter limp mode, reducing power. Continued driving can lead to increased emissions and potential damage to the SCR system. It's best to diagnose and fix as soon as possible.

Q: What does B1U2 mean in P2058?

B1U2 stands for Bank 1, Unit 2. Bank 1 is the side of the engine containing cylinder #1. Unit 2 refers to the second reductant injector on that bank (some systems have multiple injectors for better mixing).

Q: How much does it cost to fix P2058?

Costs vary widely. DIY: injector cost $50-$200, wiring repairs $10-$50. Professional repair: $200-$600 depending on labor rates and parts markup. PCM replacement can exceed $1000.

Q: Will clearing the code fix P2058?

Clearing the code may temporarily turn off the check engine light, but if the underlying issue (low circuit) is not resolved, the code will return. It's important to diagnose and fix the root cause.

Q: Is P2058 a serious error?

Yes, it is considered medium severity because it affects the emissions system and can lead to reduced performance and failed emissions tests. If ignored, it can cause further damage to the SCR catalyst.

Abstract

Error code P2058 indicates a low circuit condition in the reductant injector for bank 1 unit 2 (B1U2) in your diesel vehicle's selective catalytic reduction (SCR) system. This typically means the injector or its wiring has a fault, reducing the effectiveness of the diesel exhaust fluid (DEF) injection, which can lead to increased emissions and reduced performance.