Complete 42RLE solenoid block pack that fixes limp mode, no-upshift and solenoid circuit codes on Jeep Liberty, Wrangler, Dodge Ram 1500 and Nitro.
Part number 5143155AA is the 42RLE shift solenoid and pressure switch block, also sold as 04800171AA, 52854001AA, 04799061AB and 5143151AA. Owners usually land here after a 3.7L Liberty, a 3.8L Wrangler JK or a Ram 1500 V6 drops into limp mode with a solenoid code and the shop quote comes back for a whole transmission. This is a new replacement block; the product photos show it laid out with a filter, pan gasket and two speed sensors, which are the other parts most people renew during the same pan-down job.
The 42RLE shifts clutch to clutch, the same way as the front-drive 41TE it was developed from. Four solenoids in this block feed oil to the underdrive, overdrive, 2-4 and low/reverse clutch circuits, and pressure switches report back whether those circuits actually pressurized. The controller fires the solenoids, watches the switches and the input and output speed sensors, and if any of those signals stops making sense it sets a code and holds second gear. On early 42RLE units the controller ran fixed line pressure; Sonnax notes that variable line pressure arrived later with an added pressure sensor and line pressure solenoid, while this solenoid block stayed in service on both designs.
A solenoid circuit code is an electrical code, so the wiring and connector can set it just as easily as the block. Pull the harness plug and look for corrosion; Chrysler addressed moisture in the 42RLE solenoid pack connector with TSB 21-009-05. Check ATF level and smell next. Burnt fluid with clutch debris and high clutch volume index numbers mean the clutches are worn, which a new block will not cure. Our Ultradrive problems guide covers reading those numbers and the solenoid switch valve wear that mimics a bad block, and Wrangler owners should also read our Wrangler transmission service guide for fluid capacities and intervals.
The listing covers the Jeep Liberty 2.4L (2003-2005) and 3.7L (2003-2011), Jeep Wrangler 2.4L and 4.0L (2003-2006) and 3.8L (2007-2011), Dodge Ram 1500 and Nitro with the 3.7L V6 (2007-2011), Mitsubishi Raider 3.7L (2007-2010) and the Chrysler 300 with the 2.7L or 3.5L V6 (2005-2011). Read the number cast or printed on your old block and compare the connector shape before ordering. The 45RFE and 545RFE found in some of the same trucks use a different solenoid pack and will not interchange. If you are unsure, send your year and VIN and we will match it. Browse the rest of the family on the 41TE and 42RLE collection page.
The block is not external on this transmission. Drain the ATF, drop the pan, remove the filter, unplug the case connector and lower the valve body to reach the block screws. Clean the valve body face, fit the new block with a fresh seal, snug the screws to factory torque, and reinstall the valve body without disturbing the check balls. Finish with a new filter and gasket; a 42RLE filter and pan gasket kit covers that if yours are not new. Refill with ATF+4, set the level hot in Neutral, clear codes and perform the Quick Learn. If the fluid was badly burnt, budget for a 42RLE master rebuild kit instead of a block alone.
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Doing this repair right usually means replacing these at the same time. Same transmission, ships together.
This block is listed as replacing 5143155AA, 04800171AA, 52854001AA, 04799061AB and 5143151AA. Those numbers cover the same 42RLE solenoid and pressure switch block across its service supersessions. Compare the connector and mounting pattern on your old block to be sure.
No. On the 42RLE the block mounts to the valve body inside the pan. Plan on draining the fluid and installing a new filter and pan gasket at the same time.
Typical codes are the solenoid circuit codes P0750, P0755, P0760 and P0765 and pressure switch faults such as P0846, usually with the transmission held in second gear. The same codes can come from a corroded connector or damaged wiring, so check those first.
Yes. Clear all codes and run the Quick Learn procedure with a scan tool so the controller relearns clutch fill volumes. Skipping it can leave harsh or flared shifts.
Not unless that truck has a 42RLE. Ram V8 trucks of these years generally used the 45RFE or 545RFE, which take a different solenoid pack. The listing fitment for the Ram 1500 is the 3.7L V6.
