P2000 OBD-II Trouble Code: NOx Trap Efficiency Below Threshold Bank 1

Check Engine Light

P2000 code definition

NOx Trap Efficiency Below Threshold Bank 1

What the P2000 code means

P2000 is a general OBD2 diagnostic trouble code that indicates a malfunction with the NOx Trap; specifically, the NOx trap has efficiency that is below threshold for Bank 1. The Engine Control Module (ECM) checks for the proper levels of NOx detected and when it detects a very low threshold, a P2000 code is set. The Check Engine Light will be illuminated on the dash and may be a flashing Check Engine Light.

What causes the P2000 code?

  • Catalytic converter failure
  • Open or short within the wiring harness
  • Poor electrical connection
  • ECM that has failed or is failing
  • Failed Sensor or solenoid

What are the symptoms of the P2000 code?

In most cases, the driver will not notice any adverse symptoms. The Check Engine Light will be displayed on the dashboard in all circumstances. In some vehicles, the Check Engine Light may be flashing.

How does a mechanic diagnose the P2000 code?

  1. A scan tool will be used to check for any codes stored in the vehicle's ECM, including pending codes. A qualified technician will note the freeze frame data for every code present as this tells them what conditions the code occurred under.

  2. Next, the codes will be cleared and a test drive performed under like conditions to the original code.

  3. Now a visual inspection will be done looking for any damaged components.

  4. Next, the catalytic converter will be checked and tested for proper operation.

  5. The scan tool will then be used to check for proper sensor and solenoid operation.

  6. Lastly, the vehicles ECM will be tested.

Common mistakes when diagnosing the P2000 code

Commonly, mistakes are made when steps are skipped. When this occurs, it makes the simple items that can cause this code to be overlooked, wasting time and money. All steps must be followed to diagnose the P2000 code right the first time.

How serious is the P2000 code?

The P2000 code generally does not have any driveability symptoms. When the P2000 code is seen, it may indicate that the vehicle is dumping excess NOx into the atmosphere. NOx is one of the controlled emissions byproducts of burning fuel and will cause emissions testing to fail.

What repairs can fix the P2000 code?

Additional comments for consideration regarding the P2000 code

An advanced level scan tool is necessary to diagnose the P2000 code. These scan tools allow much more than checking and clearing the codes. Advanced level scan tools allow access to the live data stream of the vehicle which shows live data and changes over time.

Need help with a P2000 code?

YourMechanic offers certified mobile mechanics who will come to your home or office to diagnose and repair your vehicle. Get a quote and book an appointment online or speak to a service advisor at 1-800-701-6230.

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

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