Do anyone know that how to fix this code?

  • Which vehicle and what year?
    – Solar Mike
    Aug 4, 2017 at 6:52
  • Please read thru the help center to better understand how this site works. You should not be posting extremely vague hypothetical questions for the purpose of writing your own generic answer. This site is for specific questions about problems you actually are dealing with.
    – CharlieRB
    Aug 4, 2017 at 11:47
  • I would like to remind everyone, that while a more fleshed out question is probably warranted, answering your own questions is completely fine on the site. Stack Exchange encourages users to answer their own questions. Aug 4, 2017 at 13:24
  • But then should we expect answers that actually have the most common solution : ie "give the vehicle a good run" in this particular case which the OP has not managed to mention?
    – Solar Mike
    Aug 4, 2017 at 13:30
  • 1
    @SolarMike - As always, if you have a better answer or solution post it as an answer. Just because the user self-answers doesn't mean their solution is better or even correct. Aug 4, 2017 at 13:36

1 Answer 1



This error code is diesel-specific OBD-II code, which means it applies to most vehicles equipped diesel engines. Error Code P2002 is defined as Diesel Particulate Filter Efficiency below Threshold Bank 1, which refers to an issue in the efficiency of the particulate filter in the exhaust, which is most likely caused by faulty filter or sensor, or exhaust leak.

Specifications on the definition, troubleshooting, and repairs, of course, vary from one make and model to another.

Diesel engines usually offer better torque and fuel economy than gasoline engines. However, the diesel fuel itself produces more “soot” which is considered hazardous to both the atmosphere and human health. Modern diesel engine technology and fuel, on the other hand, has been refined to eliminate many of these emissions. There are, of course, still some circumstances when more soot is generated. This usually happens when the engine is not running hot, such as in stop-and-go traffic and short trips.

To capture these PM emissions, a Diesel Particulate Filter (DPF) is included in diesel engine vehicles. They’re collected during low-load conditions.


In many cases, there may not be any observable symptoms other than the Check Engine lights, but for some vehicles, the PCM may put the vehicle on ‘Limp Mode,’ which restricts both the performance of the engine and the transmission. Other vehicles with overcharged DPG may show other symptoms like: 1. Hard starting 2. Poor acceleration 3. Poor fuel economy


To diagnose this code, conduct a visual inspection of both the particulate filter and the back pressure sensor and associated wirings.

After checking those components, take the vehicle for a test drive with an OBD-II scanner connected to track the back pressure sensor readings. It would be best to have your mechanic with you for these diagnosis steps.

If Bank 1 seems to be sending mixed signals than the Bank 2, then your mechanic will conduct further troubleshooting of the sensor to determine whether the particulate sensor must be replaced.


  1. The most common solution for this code is to manually put the vehicle on the DPF regen mode by using a scan tool or taking the vehicle out on the highway for a little longer to let the heat burn off the stored PM emissions.

  2. Clearing the diesel particulate filter

  3. Changing diesel fuel

  4. Replacement of the particulate filter

  5. Replacement of DPS

  6. Diesel particulate filters were first used in the mid-2000s. If your vehicle is older, then there’s a good chance it doesn’t come with this component and you will not encounter this error code.

  • Give the vehicle a good drive at least once or twice a month - get it up to temperature and sufficient distance and it won't be an issue....
    – Solar Mike
    Aug 4, 2017 at 6:52

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