Nissan Tech Tip: Permanent DTC (P-DTC) Information

Nissan Tech Tip: Permanent DTC (P-DTC) Information

Starting with 2010 Model Year, Nissan vehicles have been gradually incorporating a new type of DTC known as "Permanent DTC or P-DTC." If a vehicle is equipped with P-DTCs, all emission-related DTCs will also set a P-DTC if the MIL is turned on.

Models: 2010 and newer

Starting with 2010 Model Year, Nissan vehicles have been gradually incorporating a new type of DTC known as “Permanent DTC or P-DTC.” Please refer to the P-DTC Applied Vehicles list. If a vehicle is equipped with P-DTCs, all emission-related DTCs will also set a P-DTC if the MIL is turned on. A listing of which DTCs that will also set a P-DTC is found in the DTC Index in the EC-Engine Control section of the service information.


If a DTC repair is performed and the DTC erased, a vehicle may fail an Emission Inspection and Maintenance test if the P-DTC is not also erased.
P-DTC’s can be erased by following the correct driving pattern:
1. Use a scan tool with the correct software to confirm a P-DTC and determine the correct driving pattern to erase it.
2. Refer to the service information, section EC-Engine Control, for driving pattern information. Look under How to Erase a Permanent DTC and Diagnosis Description.
3. Details for driving pattern B and D are included in this bulletin.
NOTE: In most cases, if repairs are complete, P-DTCs will erase with the customer driving their vehicle in their normal daily use.

Driving Patterns B and D for Erasing P-DTCs
The DTC Index in the service information, for vehicles equipped with P-DTCs, includes a group classification of “A” or “B” for DTCs that also set P-DTCs. P-DTC with a Group classification of B requires completion of driving pattern B and D to erase the P-DTC. In most cases, completion of driving pattern B will also complete pattern D.

Driving Pattern B
Driving pattern B means a trip satisfying the following conditions:
• Engine speed reaches 400 rpm or more.
• Engine coolant temperature reaches 70°C (158°F) or more.
• Vehicle speed of 70 – 120 km/h (44 – 75 MPH) is maintained for 60 seconds or more.
• Vehicle speed of 30 – 60 km/h (19 – 37 MPH) is maintained for 10 seconds or more.
• Vehicle speed of 4 km/h (2 MPH) or less with idling for 12 seconds or more.
• Vehicle speed of 10 km/h (7 MPH) or more for 10 minutes or more in total.
• 22 minutes or more elapsed time after engine start.
NOTE : Drive the vehicle at steady speeds when a “maintained” speed is required. When the same malfunction (DTC) is detected regardless of driving conditions, driving pattern B must be restarted.

Driving Pattern D
Driving pattern D means a trip satisfying the following conditions:
• Vehicle speed of 40 km/h (25 MPH) or more for 300 seconds or more.
• Maintain continuous idle speed for 30 seconds or more.
• 600 seconds (10 minutes) or more elapsed time after engine start.
NOTE : When the same malfunction (DTC) is detected regardless of driving conditions, driving pattern D must be restarted.

Courtesy of Mitchell 1.

You May Also Like

How To Diagnose Slow or Sluggish Oxygen Sensors

When oxygen sensors are tested, manufacturers will introduce small amounts of oil to measure sensitivity.

An engine management system is always trying to find the perfect air/fuel ratio. But it is next to impossible to walk the line between too rich or too lean. With every revolution of the crankshaft, small changes in the air, fuel and operating conditions can cause changes to the oxygen content coming out of the exhaust port.

E-15 Ethanol Damage to Fuel Pumps

One of the problems with ethanol is how it reacts to water in the air and in the tank.

Oxygen Sensor Questions Answered

If an O2 sensor is not reading properly or is borderline, it should be replaced regardless of its age or mileage.

Managing (DPF) Diesel Particulate Filter Regeneration Cycles

The DPF is designed to store the soot and ash, to later burn them off during a regeneration cycle.

Ultimate Underhood – Gasoline Particulate Filters

Just like a DPF, a gasoline particulate filter (GPF) traps and stores soot particles in the exhaust stream.

Other Posts
Inspection Tips For Chain-Driven Water Pumps

If one water pump fails sooner and is replaced without an investigation, the new pump is likely doomed.

Water pump feature
GM SuperCruise Unavailable

The cause of the condition may be due to the map module not having the latest software available for the road expansion map to update.

Misfire Codes P0300, P0301-P0312 and P0313+P0314

The only way to clear the code is to use a crankshaft position relearn with a scan tool.

The January Digital Edition Is Available Today

Each issue includes technical content from Underhood Service.