Parts for your 2009 Nissan Pathfinder-Transmission filter

2009 Nissan Pathfinder transmission filter — what’s fitted and how to look after it

For the 2009 Nissan Pathfinder (R51), the automatic models run Nissan’s 5-speed RE5R05A transmission, which uses an internal transmission oil strainer (often called a transmission filter) inside the sump pan. Nissan’s R51 Service Manual (TM section for the RE5R05A) and the factory maintenance schedule note this strainer is present but not listed as a routine service item, it’s typically only replaced when the pan is off for repair or overhaul. Nissan parts catalogues for the RE5R05A back this up by listing an “oil strainer” and pan gasket as service components. Manual gearboxes don’t use a transmission filter, so this info applies to the autos.

The filter’s job is straightforward: it screens out clutch material and fine debris so the hydraulic circuits and solenoids keep operating crisply. Clean fluid and a healthy strainer help preserve shift quality and extend the life of the valve body and torque converter — especially important if the vehicle tows, sees off-road work, or spends time in stop–start traffic.

Because Nissan doesn’t call for routine strainer replacement, smart owners focus on fluid condition. A conservative approach in Aussie and Kiwi conditions is a drain-and-fill every 60,000–90,000 kilometres, using Nissan Matic S (supersedes Matic J) or an approved equivalent. A single drain-and-fill typically replaces about 4–5 litres, full capacity is roughly double that, so some shops do two or three drain-fills, driving briefly between, to refresh most of the fluid without a high-pressure flush. If the pan is already coming off for a repair, that’s the perfect time to replace the strainer and pan gasket and clean the magnets.

• Watch for symptoms: delayed engagement, flare on shifts, harsh shifts, or burnt-smelling, dark fluid. These are cues to service the fluid and inspect the pan.
• If towing regularly, shorten intervals, heat is the enemy of ATF and friction materials.
• Use the correct spec fluid and a clean fill procedure, mixing fluids or overfilling can create shift issues.

Bottom line: the 2009 Pathfinder’s auto does use a filter — it’s an internal strainer — but the everyday maintenance win is timely fluid service. Replace the strainer when the pan’s off or any time there’s evidence of internal wear or contamination.

Popular questions

Does a 2009 Nissan Pathfinder have a transmission filter?
Yes — on automatic models it’s an internal oil strainer inside the transmission pan. It’s not usually replaced on a time or distance interval, but it’s commonly renewed when the pan is removed for repairs or if there are contamination concerns.

How often should the transmission filter be replaced on a 2009 Pathfinder?
There’s no routine interval in Nissan’s schedule. Many workshops replace the strainer when the pan is off, or any time there’s burnt/dirty fluid, shift faults, or metal in the pan. Otherwise, focus on periodic ATF drain-and-fills.

What ATF does it use and how much is needed for a drain-and-fill?
Use Nissan Matic S (or an approved equivalent that states compatibility with RE5R05A). A typical drain-and-fill takes about 4–5 litres. Full system capacity is roughly double that, so multiple drain-fills may be used to refresh most of the fluid.