P2002

The P2002 code means the PCM has detected a diesel particulate filter efficiency below threshold (bank 1) fault. This code relates to the exhaust system components that manage and monitor exhaust gas flow, pressure, and filtering. An issue in the exhaust system can affect engine efficiency, emissions output, and overall vehicle performance. This guide covers everything you need to know about this topic, including common causes, step-by-step solutions, and answers to frequently asked questions.

Here are the key things to understand: Check Engine Light (MIL) illuminated. DPF warning light illuminated. Increased exhaust noise. Poor fuel economy. Understanding these fundamentals will help you diagnose and resolve this issue more effectively.

The most common reasons this occurs include: Clogged diesel particulate filter (DPF). Failed catalytic converter. EGR system malfunction affecting exhaust. Cracked exhaust pipe or joint. Identifying the root cause is the first step toward finding the right solution.

To resolve this, follow these recommended steps: Connect an OBD-II scanner and read all stored trouble codes and freeze frame data. Visually inspect the exhaust system for leaks, cracks, or damage. Test the exhaust pressure or temperature sensor with a multimeter. Check the DPF or catalytic converter for blockage. Inspect wiring and connectors for the exhaust circuit. If these steps do not resolve the issue, consider consulting additional resources or a qualified professional.

This article is part of our Powertrain (P) collection on OBD Codes. We provide comprehensive, up-to-date information to help you find solutions quickly.