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 $79.99 - $89.99 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

What others are asking

Engine seemed to be running too rich or too lean, not sure which.

Many different problems can cause an engine to run rough and lack power. The first step is to retrieve the diagnostic code associated with the check engine light. This will provide a general idea of where to begin the diagnostic...

can not get my 2013 nissan altima out of park

It is possible that your shift lock solenoid may have failed. I would recommend having it tested by a qualified professional to determine if it is functioning properly. Consider YourMechanic as this can be done at your home or office....

How much should a service cost for replacing interior door latches on a 2013 Nissan Altima?

Hi there. When it comes to finding out how much to charge a customer, the best thing to do is call the dealership and ask for the labor prices, call a local shop and ask for the labor prices, and...

Squeaking sound coming from the front of the car when driving slow

This is very likely related to something that increases with engine speed. The drive or serpentine belts can make squeaking noises that will speed up as they do with engine speed. This is usually due to a loose or slipping...

How do I know when to change my tires?

Mechanics usually check tires with a tread depth gauge that measures in 1/32 of an inch. Depending on the tire it can be manufactured anywhere between 8/32 to 13/32 of an inch of tread. Tires become unsafe and illegal, depending...

No compression but spark is there, fuel goes good. What is happening? The car only cranks and doesn't start.

Hi there, thanks for writing in. Unfortunately, if there is no compression, you have internal engine failure. This could be piston ring failure. Generally, a used engine would be the order for the repair as the cylinder walls could be...

Nail in tire was removed but tire did not lose air. Nail did not penetrate all the way thru. Is tire still safe?

Hey there. As long as you sprayed soapy water on the area and no leak was found then you should be okay to operate the car without too much worry. If there was a leak, you would begin to see...

My car keeps shutting off itself and shaking

Shaking or vibration may be caused by many different things such as faulty spark plugs, poor fuel pressure or misfires. Other things such as a faulty idle air control valve may cause the engine idle to drop below the normal...

My car turns off when the air conditioning comes on - 2013 Nissan Altima

The A/C system depends on the drive or serpentine belts driven by the motor to work. If the A/C is putting extra load on the engine, the engine will suffer and can stall. You will want to start by watching...

Related articles

How Long Does a Fuel Pressure Regulator Last?
In In order for the fuel system in a car to operate properly, it will need to have the right amount of pressure. The injectors that are mounted in each cylinder of the engine have to disperse the right level...
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...
Can a Loose Gas Cap Let Gas Leak Out of the Fuel Tank?
The The short answer is: yes ... kind of. What escapes out of a loose or faulty gas cap is gas vapor. Gas vapor rises off of the pool of gasoline in the tank and hangs around in the...