P2048 Fault Code

Reductant Injector Circuit Low Bank 1 Unit 1

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

The P2048 fault code indicates an issue with the reductant injector circuit on Bank 1, specifically for Unit 1. This fault typically occurs in diesel engines equipped with selective catalytic reduction (SCR) systems. The reductant injector is responsible for spraying diesel exhaust fluid (DEF) into the exhaust stream to reduce nitrogen oxides (NOx) emissions. A low circuit issue signifies that the ECM (Engine Control Module) has detected a voltage or current problem in the injector circuit that may hinder proper operation.

What are the symptoms of the P2048 code?

Common symptoms associated with the P2048 fault code include:

• Illuminated Check Engine Light (CEL).
• Reduced engine power or performance due to active limp mode.
• Increased emissions of NOx, leading to potential environmental violations.
• Difficulty in starting the engine or excessive crank time.
• Potentially noticeable DEF leaks around the injector area.

What causes the P2048 code?

Several factors can lead to a P2048 code, including:

• Short circuit in the wiring harness connected to the reductant injector.
• Open circuit due to damaged wiring or connectors.
• Faulty reductant injector unit.
• Malfunctioning ECM that fails to provide adequate control or monitoring.
• Issues with the DEF quality or blockages.

How to fix P2048?

To resolve the P2048 code, consider the following steps:

• Perform a thorough inspection of the wiring harness and connectors associated with the reductant injector for any signs of damage or corrosion.
• Check the resistance and operation of the reductant injector itself, replacing it if it’s faulty.
• Test the ECM to ensure it’s providing the correct voltage to the injector circuit.
• Clear the fault code and run a diagnostic to see if it reappears, confirming the issue has been resolved.