archer1.8 Posted February 9, 2015 Share Posted February 9, 2015 Friends car has an 05 lgt 5eat stage 2 for about a year. He never beats it or anything crazy. He gets a 1844 trans code on long trips then goes away until another trip. I read things like trans will explode tomorrow to it just needs an oil change. Car shifts great, new oil in the trans, and no funny noises. Any ideas? Link to comment Share on other sites More sharing options...
travrach Posted February 9, 2015 Share Posted February 9, 2015 DTC P1844 TRANSMISSION FLUID PRESSURE SENSOR/SWITCH E CIRCUIT DTC DETECTING CONDITION High & low reverse clutch oil pressure switch malfunction TROUBLE SYMPTOM Excessive shift shock NOTE: Refer to DTC P0761 for diagnostic procedure. DTC P0761 SHIFT SOLENOID C PERFORMANCE OR STUCK OFF DTC DETECTING CONDITION Output signal value of high & low reverse clutch solenoid and oil pressure does not match. TROUBLE SYMPTOM Locked to 4th gear. I think it should be properly diagnosed when the light is on. Link to comment Share on other sites More sharing options...
M. Schneider Posted September 15, 2017 Share Posted September 15, 2017 The 5EAT transmission operates fine with nothing symptomatic,,, and then the ODB error code P1844 makes an appearance. The P1844 ODB error code first happened on a 1,500 mile (ATL-DEN) summer road trip. With the Code error the Subaru OB XT disables the cruise control all the while flashing its dash lights etc. Once the ODB condition is erased via the reader, its all is good until the next P1844 code episode. The MY05 Outback XT w/5EAT auto gearbox was new to us, that is to say the vehicles service history is first hand knowledge from 11 miles until 125K mi today. At about 50K miles or 6yo the 5EAT trans fluid & inline filter located behind the battery were changed/serviced by Subaru Denver. At about 100,000 miles I personally changed the 5EAT fluid and inline filter using OEM fluid and filter element. The procedure taken was to drain the 5EAT fluid pan by its single bolt drain, maybe 3+ quarts actually drained. The trans fluid pipe circuit to the filter and onto the radiator installed cooler and back to the transmission was also drained of 5EAT trans fluid; maybe 1 quart. The 5EAT took about 4 quarts to refill. After about 250 miles the above 5EAT fluid drain procedure was repeated. I wasn't anywhere secure to effectively remove the transmission pan altogether, which would have captured more fluid. ("Cleanliness is an automatic transmission's friend") So next best service practice was the 2 step scheme... With an April '17 5EAT fluid/filter service and a 3,000mi ATL to Vail to ATL road trip behind us there was no sign of ODB P1844 error code. Fast forward September '17 and bingo P1844 made a showing. Go figure? The MY05 Outback XT has the easiest life a car can have ... mostly weekly runs on Monday (60mi) to the ATL airport, parked inside,, until Wednesday comes along and its headed home to another garage. O well, be that as it may. ODB error code P1844 is being reported more and more. Is there a settled conclusion to the 5EAT error code P1844 ? Cheers, Mike |`94 E-Class Coupe |`98 Carrera 993 C2S |`14 Cayman S |`20 Outback Touring XT | All Debadged | Link to comment Share on other sites More sharing options...
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