Q: P2002 DTC Particulate Trap Efficiency Below Threshold

asked by on January 12, 2017

Approximately 3 months ago a cracked Charged Air Hose was replaced after a P2002 and simultaneous turbocharger related code (don't have dtc). The car was code free for three months and 7000 miles. The P2002 code returned and was cleared numerous times. The code returns within either a few trips or up to two weeks. U144F00, P261F71. P13E77B were found once as pending codes on the ECU with a scanner. Simultaneously, the P2A00 code (O2 Sensor Circuit Range/Performance) was found once as a pending code. The DPF has been removed from the vehicle, inspected, cooked in a kiln, blown clean with compressed air and reinstalled. The vehicle has since been driven 5000 miles and continues to have P2002 codes intermittently. The DPF has successfully performed at least 2 regens since the off vehicle cleaning. The differential pressure sensor has been monitored while driving with the scanner. Pre and post dpf values differ from 0 to 3 psi. What do the undefined dtc's mean and how to resolve P2002?

My car has 107000 miles.
My car has an automatic transmission.

Warning Light is on Inspection $94.99 - $114.99 Get a Quote

Hi there. The P2002 could be solved by checking the following conditions:

  • Driving too slow or idling the engine too long will cause this code. It takes heat in the 932 F to 1112 F range to burn off the soot in the DPF
  • There is an air leak forward of the DPF
  • Fuel with a large percentage of sulfur will clog the DPF
  • Aftermarket accessories and performance modifications will cause the code P2002
  • A dirty air filter to the engine
  • The DPF may be damaged
  • There could be a defective ECU (computer)

If all of the symptoms are check and all are functioning properly, then I recommend seeking out a professional, such as one from Your Mechanic, to help you diagnose the emission system to your vehicle.

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

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing


Experienced Mechanic?

Earn up to $70/hr

What others are asking

How Does the Fuel Pump Know When to Shut Off?
The are two main components that make most fuel pumps run: the PCM (Powertrain Control Module) and the fuel pump relay. Fuel pumps (https://www.yourmechanic.com/services/fuel-pump-replacement) themselves don’t know when to shut off. They are entirely dependant on the fuel pump relay...
Car rattling upon acceleration.
The noise you may be hearing is either the catalytic converter is rattling from being broken up inside it. You may be hearing an engine ping that sounds like a rattle from the engine. It could also be one of...
Brake light and turn signal not working
Hi. There could be an issue with the light bulb sockets so they should be inspected for problems. Also, have a certified mechanic make sure the proper power from the multifunction switch in the steering column (Turn signal switch) is...
Throttle body position sensor
The rumbling noise may be coming from the loose catalyst in the exhaust piping. It would need to be verified by a road test to listen to the noise. If the catalyst is breaking up in the exhaust then the...
My Toyota Corolla 2015 EPS came on when I just drove about a minute from my house. The brakes of the car are hard
Hello, thank you for writing in. It sounds like you may have a voltage problem going on. I usually check the connection me at the battery first. If the battery connections are fine then the alternator and battery must be...
Why is my trip meter not working?
The trip odometer display typically allows you to track an A or B trip on a 2015 Dodge Avenger. If you've referred to your owner manual and followed the instructions for resetting the trip odometer, and it's not working, it's...
How to fix the hard power steering issue 2011 Ford Fusion
Hello - you are correct. This problem should be fixed by Ford under Recall #15V340000. This is a significant safety issue, and replacement of the steering gear is required. If you are not getting a satisfactory response from your Ford...
Car is in limp mode and making strange sound when beginning to rev.
Hi there: When the oxygen sensors have a reading that is similar to each other, it is an indication that the catalytic converter is not working as efficiently as it is intended. If the voltage of the downstream oxygen sensor...
Struggling to go uphill and muffler sounds get louder and strong smell of gas fumes.
It sounds like you may have a clogged catalytic converter. The catalytic converter converts toxic exhaust gases into less harmful pollutants that are suitable to be expelled into the atmosphere. When this is clogged, this causes these gases to be...

Related articles

Does Buying Good Quality Gas Matter?
Gasoline Gasoline is refined from crude oil and can contain impurities and minor inconsistencies. Because of this, it is standard practice for additives to be mixed into gas. This means that one person can fill up their car anywhere and...
A Buyer’s Guide to the 2012 Mercedes-Benz SL-Class
Nothing Nothing says true sport luxury like a Mercedes hardtop convertible, and the SL more than delivers on the name’s promises. While both the SL and its sibling, the SLK, offer superior luxury, handling, and comfort, the SL boasts the...
Symptoms of a Bad or Failing Air Fuel Ratio Sensor
If you notice a decrease in fuel efficiency or engine power output, as well as a rough idle, you may have to replace any air-fuel ratio sensors.