Remanufactured RE5R05A control unit replacing 0260550002 when the Nissan and Infiniti five-speed drops into limp mode or will not upshift.
When a Nissan Armada, Frontier or Xterra, or an Infiniti G35, starts dropping into limp mode, refuses to upshift, or brings back the same electrical codes right after the solenoids were replaced, the part people end up searching for is the transmission control module. This is a remanufactured TCM for the Jatco RE5R05A five-speed, the Bosch-type plate that cross-references to 0260550002 and Nissan/Jatco 31040-90X10 (also listed as 3261099309, A5SR1 and A5SR2). It is the electronics only: the circuit board and frame that the solenoids plug into, not the valve body underneath it.
On the RE5R05A the transmission computer is not tucked behind a kick panel. It is a flat plate that bolts to the top of the valve body inside the oil pan, with molded connectors that plug directly onto the shift and pressure solenoids and a case connector that carries power and vehicle data in from the harness. Because it lives in hot fluid, it also carries the internal sensors the unit relies on. It reads input and output speed, fluid temperature and throttle data, then decides when to shift and how hard to apply each clutch and the front band by driving the solenoids. Transmission Digest documents both Bosch and Hitachi versions of this module, and a later valve body design (around 2009-10) that dropped most of the pressure switches and the second temperature sensor along with a TCM programming change. That history is why the number on your old plate matters so much.
Start with the fluid and the codes. Milky or pink fluid means coolant got in, and the Transmission Digest case on converter shudder after a cooler repair is a good reminder that the whole unit has to be checked, not just the part that threw a code. Next, check the case connector and the external harness for oil wicking up the wires, and confirm power and ground at the connector. If the solenoids measure within their published resistance range, the wiring is clean, and the circuit codes still come back, the module is the likely failure. Our RE5R05A service guide for Pathfinder, Armada and QX56 covers the fluid checks and solenoid testing step by step. If the solenoids themselves test bad, a RE5R05A solenoid kit is the cheaper fix.
The listing names the Nissan Armada, Frontier and Xterra and the Infiniti G35 and G37 with the RE5R05A automatic; the G37 only qualifies in the years it used the five-speed. The cross-reference data also mentions a Hyundai Genesis, which we cannot confirm, so do not order for any vehicle on the strength of its name alone. Pull the pan, read the number printed on your existing plate and match it to 0260550002 / 31040-90X10, or send us your year and VIN and we will check it. A Hitachi-type module is not a direct swap for this Bosch-type plate. Every RE5R05A part we stock is on the RE5R05A collection page.
If the transmission is coming out for clutch or band wear at the same time, a RE5R05A master rebuild kit covers the seals, gaskets and frictions in the same job.
| Transmission | |
| Replaces | |
| Condition | |
| Warranty | |
| Fitment | |
| Mounting |
Doing this repair right usually means replacing these at the same time. Same transmission, ships together.
Yes. On the RE5R05A the control module is a flat plate that bolts to the top of the valve body inside the pan and plugs directly onto the solenoids. You reach it by draining the fluid and dropping the pan; the transmission stays in the vehicle.
Measure the solenoids against their published resistance values and check the case connector and harness for oil intrusion. If the solenoids test good, the wiring is clean and the same circuit codes keep returning, the module is the likely fault. If a solenoid is out of range, replace the solenoid first.
Only if the number matches. Match 0260550002 / 31040-90X10 on your existing plate before ordering. Bosch and Hitachi versions exist and the later valve body design changed the electronics, so the printed number on your old module is what decides fitment. Send us your year and VIN if you are unsure.
Expect to. Plan on having it programmed or initialized to the vehicle with a Nissan-capable scan tool, then clear codes and road test so the shift adaptives can relearn.
Nissan Matic S ATF, with Matic J listed by Nissan as the approved alternative. Check the level with the fluid at operating temperature.
Always fit a new filter and pan gasket. If the fluid was milky from a cooler failure, fix the cooler and flush the system first, and inspect the clutches, because coolant damages the frictions as well as the electronics.
