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Home/DTC Codes/Chevrolet/Impala/2017-2017 2.5L I4 Ecotec/P2000
P2000

NOx Trap Efficiency Below Threshold Bank 1

2017-2017 Chevrolet Impala 2.5L I4 Ecotec

High SeverityPowertrainGeneric (SAE)

The 2017 Chevrolet Impala is equipped with a 2.5L inline-4 engine. Below you'll find detailed p2000 diagnostic code information including labor time estimates, cost ranges, and technician notes specific to this engine configuration.

Description

The NOx storage catalytic converter on bank 1 is not efficiently reducing nitrogen oxides.

Symptoms

  • Check engine light
  • Failed emissions test
  • Reduced fuel economy

Common Causes

  • Degraded NOx trap
  • Sulfur contamination
  • Exhaust leak before sensor
  • Faulty NOx sensor

Diagnostic Steps

  1. Read freeze frame data
  2. Check NOx sensor readings upstream and downstream
  3. Inspect for exhaust leaks
  4. Perform desulfation procedure if applicable

Repair Notes

Replace NOx trap if desulfation fails. Check upstream components for causes of contamination.

Related Codes

P0420Catalyst System Efficiency Below Threshold Bank 1P2001NOx Trap Efficiency Below Threshold Bank 2

Other Powertrain Codes

P2000 on Other Vehicles

Chevrolet Astro

1996-1996 4.3L V6 Vortec

Chevrolet Astro

1997-1997 4.3L V6 Vortec

Chevrolet Astro

1998-1998 4.3L V6 Vortec

Chevrolet Astro

1999-1999 4.3L V6 Vortec

Chevrolet Astro

2000-2000 4.3L V6 Vortec

Chevrolet Astro

2001-2001 4.3L V6 Vortec

Chevrolet Astro

2002-2002 4.3L V6 Vortec

Chevrolet Astro

2003-2003 4.3L V6 Vortec

Common Questions

What does code P2000 mean on a 2017-2017 Chevrolet Impala?

P2000 stands for "NOx Trap Efficiency Below Threshold Bank 1". The NOx storage catalytic converter on bank 1 is not efficiently reducing nitrogen oxides.

What are the symptoms of P2000 on a Chevrolet Impala?

Common symptoms of P2000 include: Check engine light, Failed emissions test, Reduced fuel economy.

What causes P2000 on a 2017-2017 Chevrolet Impala?

Common causes of P2000 include: Degraded NOx trap, Sulfur contamination, Exhaust leak before sensor, Faulty NOx sensor.

Last updated: March 2026

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