P2058 OBD-II Trouble Code: Reductant Injector Circuit High Bank 2 Unit 2

Diagnostic Trouble Code (DTC): P2058

P2058 code definition

Reductant Injector Circuit High Bank 2 Unit 2

What the P2058 code means

P2058 is an OBD-II generic code for the engine control module (ECM) detecting the reductant injection air pump control circuit for bank 2 unit 2 having an open or short in the circuit.

What causes the P2058 code?

• The ECM controls the reductant injection air pump. The ECM can detect open circuits or high resistance in the control circuit and will turn on the Check Engine Light if it detects a fault.

• A short to power in the control circuit from the ECM to the reductant injector air pump.

• The high voltage battery supply is shorted to the control circuit return wire.

What are the symptoms of the P2058 code?

• The Check Engine Light will be illuminated and the code set in ECM memory as a fault.
• The exhaust emission may be richer than expected.
• The vehicle will fail any emission tests due to the illuminated Check Engine Light.

How does a mechanic diagnose the P2058 code?

• Scans for codes and documents the codes in the ECM; looks at the freeze frame data for failure.

• Checks the air pump wiring connections for problems with loose or corroded connections.

• Checks the air pump for the proper resistance or shorts in the pump circuit.

• Follows the manufacturer pinpoint tests for the diagnosis and replacement of the reductant injector and air pump.

Common mistakes when diagnosing the P2058 code?

• Clearing ECM memory codes before checking the freeze frame data for the main failure problem, so the failure may be duplicated and repaired.

• Failing to clear the ECM codes after the codes are fixed so the ECM will enable the system to normal again.

How serious is the P2058 code?

Code P2058 is a code that may not cause any drive complaints but will illuminate the Check Engine Light and cause a vehicle to fail an emission test.

What repairs can fix the P2058 code?

• Replacing the air pump

• Repairing the connector pins of shorted harness, and repairing corrosion or loose connections at the reductant injector and air pump

• Replacing an ECM as directed from manufacturer pinpoint tests.

Additional comments for consideration regarding the P2058 code

Code P2058 is for an open or shorted circuit for the reductant injector air pump. This is a code only used by a couple of different manufacturers, so meanings may be different from your vehicle than this article implies. Follow the pinpoint test for the vehicle you are working on to determine if your vehicle uses the reductant injection system.

Need help with a P2058 code?

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