RE5R05A Solenoid Kit 2004-2009

This solenoid kit is for the early production years of the Nissan RE5R05A five-speed automatic, 2004 through 2009. That window covers the first Titan, Armada and Infiniti QX56 trucks (which got the RE5R05A from their 2004 launch) and the 2005-2009 Pathfinder, Frontier and Xterra. If your truck is throwing shift solenoid codes, dropping into a single-gear limp mode, banging into gear, or skipping a gear on the way up, a worn solenoid set is one of the most common reasons on these units, and replacing the whole set at once is cheaper than chasing them one at a time.

What the solenoids do in a 2004-2009 RE5R05A

The RE5R05A has no shift valves you can move through the cable. The transmission control module decides every shift and executes it by switching the solenoids mounted on the valve body. Each solenoid meters oil to a specific friction element: the input and direct clutches, the front brake band, the low coast brake and the high and low/reverse clutches, with separate solenoids handling line pressure and converter lockup. Sonnax documents that those solenoids are fed through two pilot valves in the valve body, so the system depends on both clean oil and solenoids that still open and close crisply. When a coil weakens or the plunger bore wears, the module commands a shift but the clutch receives too little pressure or receives it late, and you feel a flare, a slam, or no shift at all.

The kit pictured is a complete set of the valve body solenoids, so every circuit gets fresh parts at the same time instead of mixing new and 15-year-old pieces.

Symptoms that point to the solenoid set

• Stuck in one gear after a code sets, with normal shifting returning after a key cycle
• Harsh engagement into Drive or Reverse, or a delay before the truck moves
• Erratic or skipped upshifts, especially once the fluid is fully warm
• Shift solenoid codes in the P0750-P0770 range, P0745 for the line pressure solenoid, or P0740/P0743 for the converter clutch circuit
• Shudder or flare that started after the radiator cooler failed and coolant got into the fluid; this model is known for it, and water-damaged fluid ruins solenoids along with the clutches

How to confirm before you buy

Pull the codes and note whether they are electrical (circuit high, low or open) or performance codes. An electrical code can be checked with an ohmmeter at the solenoid connector; a performance code with good resistance usually means internal wear, which the meter will not catch. Then check the fluid. Pink or milky fluid means the cooler in the radiator has leaked, and that has to be fixed before any new solenoid goes in. Our RE5R05A service guide walks through the code list, fluid check and pressure diagnosis step by step.

One detail matters specifically for this year range: Sonnax reports that Infiniti used a low-resistance low coast solenoid (10-15 ohms) until August 2005, while Nissan trucks and later Infiniti units use a 20-40 ohm version. A 2004 or early-2005 QX56 can fall on either side of that change, so measure your old low coast solenoid before installing.

Fitment

This listing is for RE5R05A transmissions in 2004-2009 vehicles. Sonnax also notes three valve body design levels over the life of this transmission, so compare the new solenoids against yours for connector style, mounting tab and body shape before you start bolting things in, or send us your year and VIN and we will check it. Later trucks have their own kit: see the RE5R05A solenoid kit for 2005-2021, and the full lineup on our RE5R05A parts page.

Install notes

• The solenoids are serviced with the pan off; drain the fluid, remove the pan and filter, then unplug the harness and unbolt the solenoids from the valve body.
• Inspect the internal harness and connector pins. Heat-cracked insulation or green pins will make a new solenoid look bad.
• Lube every new O-ring with fresh ATF and seat each solenoid by hand before tightening its bolt.
• Install a new filter and pan gasket at the same time; the RE5R05A filter and gasket kit covers that.
• Refill with the Nissan fluid listed in your owner's manual (later trucks call for Matic S, with Matic J allowed as the alternate), check the level at operating temperature, then clear codes and let the module relearn over several drive cycles.

If the converter clutch is your only complaint, the RE5R05A TCC solenoid is sold on its own. If the bores in the valve body are worn, solenoids alone will not cure it, and a complete valve body is the better fix.

Will this kit fit my 2006 Nissan Titan?

It is listed for 2004-2009 RE5R05A applications, which includes the 2006 Titan. Compare connector style and mounting tabs with your old solenoids, or send us your VIN and we will confirm before it ships.

My 2005 QX56 has a low coast solenoid code. Does anything special apply?

Yes. Infiniti used a 10-15 ohm low coast solenoid until August 2005 and the 20-40 ohm Nissan version after that. Measure the old low coast solenoid and make sure the replacement matches its resistance.

Should I replace the filter when I install solenoids?

Yes. The pan is already off, so a new filter and pan gasket cost little and keep debris from the old failure out of the new solenoids.

What fluid do I refill with?

Use the Nissan ATF listed in your owner's manual. Later Frontier manuals call for Genuine Nissan Matic S, with Matic J as the approved alternate. Do not use the Matic D that goes in the transfer case.

Do I need a relearn after installing new solenoids?

Clear the codes and drive the truck through all gears for several drive cycles so the module can adapt to the new solenoids. Shifts may feel slightly firm or soft until that settles.

• Nissan/Infiniti RE5R05A Transmission Service Guide: Pathfinder, Armada, QX56