Q: P2002 DTC Particulate Trap Efficiency Below Threshold

asked by on

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.

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.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. P2002 DTC Particulate Trap Efficiency Below Threshold

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

Get a quote

What others are asking

Q: Vehicle stalled while driving and will not restart

Hello, thank you for writing in. The first thing you will likely want to look into is the fuel on the spark plugs. It sounds like one of your fuel injectors may have failed. If they are leaking and too...

Q: My car is only 3 years old. Should I be suspicious that the starter went out?

Hi, thanks for writing in. A starter like any other mechanical and electrical part is subject to failing sometimes for no apparent reason. However, sometimes this is misdiagnosed as well and often times mistaken for something much more simple like...

Q: Car wont start ive changed rotor distcap plugs wires fuel pumps csps rear.

Well, You've hit on many of the common failure items except one. Your car has a large fuel pump relay that is prone to failure and is usually the first thing I look at on the old 124 body cars...

Related articles

Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.