{"product_id":"k-4225-genuine-eaton-tcm-transmission-control-module-ep3","title":"K-4225 | Genuine Eaton TCM Transmission Control Module EP3","description":"\u003cp\u003e\u003cstrong\u003eDescription:\u003c\/strong\u003e TCM Transmission Control Module Gen 3 EP3 transmission systems\u003cbr\u003e\u003cstrong\u003eCondition:\u003c\/strong\u003e New\u003cbr\u003e\u003cstrong\u003eBrand:\u003c\/strong\u003e Eaton®\u003cbr\u003e\u003cstrong\u003ePart Number:\u003c\/strong\u003e K-4225, K4225\u003cbr\u003e\u003cbr\u003e\u003cstrong\u003eFitment Guide K-4225:\u003c\/strong\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003ctable width=\"100%\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e \n\u003cp data-start=\"171\" data-end=\"196\"\u003eCommonly Used With Eaton AutoShift, Eaton UltraShift, UltraShift PLUS, Fuller Advantage automated transmissions.\u003cbr\u003e\u003c\/p\u003e\n\u003cp data-start=\"296\" data-end=\"383\"\u003eThese transmissions were installed in many Class 6–8 trucks from manufacturers such as: \u003cspan class=\"hover:entity-accent entity-underline inline cursor-pointer align-baseline\"\u003e\u003cspan class=\"whitespace-normal\"\u003ePeterbilt, \u003c\/span\u003e\u003c\/span\u003e\u003cspan class=\"hover:entity-accent entity-underline inline cursor-pointer align-baseline\"\u003e\u003cspan class=\"whitespace-normal\"\u003eKenworth, \u003c\/span\u003e\u003c\/span\u003e\u003cspan class=\"hover:entity-accent entity-underline inline cursor-pointer align-baseline\"\u003e\u003cspan class=\"whitespace-normal\"\u003eFreightliner, \u003c\/span\u003e\u003c\/span\u003e\u003cspan class=\"hover:entity-accent entity-underline inline cursor-pointer align-baseline\"\u003e\u003cspan class=\"whitespace-normal\"\u003eInternational, \u003c\/span\u003e\u003c\/span\u003e\u003cspan class=\"hover:entity-accent entity-underline inline cursor-pointer align-baseline\"\u003e\u003cspan class=\"whitespace-normal\"\u003eVolvo Trucks, \u003c\/span\u003e\u003c\/span\u003e\u003cspan class=\"hover:entity-accent entity-underline inline cursor-pointer align-baseline\"\u003e\u003cspan class=\"whitespace-normal\"\u003eMack Trucks, \u003c\/span\u003e\u003c\/span\u003e\u003cspan class=\"hover:entity-accent entity-underline inline cursor-pointer align-baseline\"\u003e\u003cspan class=\"whitespace-normal\"\u003eWestern Star\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e\u003cbr\u003eA TCM (Transmission Control Module) \u003cstrong\u003eK-4225\u003c\/strong\u003e is the computer that controls an automatic vehicle transmission. It monitors sensors throughout the drivetrain and decides when and how the transmission shifts gears.\u003c\/p\u003e\n\u003ctable width=\"100%\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e \n\u003cp data-start=\"313\" data-end=\"343\"\u003e\u003cstrong\u003e1. Controls gear shifting\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp data-start=\"344\" data-end=\"360\"\u003eThe TCM decides:\u003c\/p\u003e\n\u003cul data-start=\"361\" data-end=\"446\"\u003e\n\u003cli data-section-id=\"lo174y\" data-start=\"361\" data-end=\"382\"\u003e\u003cstrong data-start=\"363\" data-end=\"382\"\u003eWhen to upshift\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli data-section-id=\"1e7q4k5\" data-start=\"383\" data-end=\"406\"\u003e\u003cstrong data-start=\"385\" data-end=\"406\"\u003eWhen to downshift\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli data-section-id=\"p6k2i7\" data-start=\"407\" data-end=\"446\"\u003eWhich gear is best for speed and load\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"448\" data-end=\"479\"\u003eIt constantly adjusts based on:\u003c\/p\u003e\n\u003cul data-start=\"480\" data-end=\"546\"\u003e\n\u003cli data-section-id=\"1yprtj\" data-start=\"480\" data-end=\"495\"\u003eVehicle speed\u003c\/li\u003e\n\u003cli data-section-id=\"tvb2ll\" data-start=\"496\" data-end=\"508\"\u003eEngine RPM\u003c\/li\u003e\n\u003cli data-section-id=\"gumhyu\" data-start=\"509\" data-end=\"525\"\u003eThrottle input\u003c\/li\u003e\n\u003cli data-section-id=\"lnnww1\" data-start=\"526\" data-end=\"546\"\u003eDriving conditions\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"553\" data-end=\"588\"\u003e\u003cstrong\u003e2. Improves driving smoothness\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp data-start=\"589\" data-end=\"656\"\u003eThe TCM manages shift timing and hydraulic pressure so shifts feel:\u003c\/p\u003e\n\u003cul data-start=\"657\" data-end=\"687\"\u003e\n\u003cli data-section-id=\"66y53e\" data-start=\"657\" data-end=\"665\"\u003eSmooth\u003c\/li\u003e\n\u003cli data-section-id=\"179o4ml\" data-start=\"666\" data-end=\"673\"\u003eQuick\u003c\/li\u003e\n\u003cli data-section-id=\"kaw758\" data-start=\"674\" data-end=\"687\"\u003eComfortable\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"689\" data-end=\"706\"\u003eIt helps prevent:\u003c\/p\u003e\n\u003cul data-start=\"707\" data-end=\"746\"\u003e\n\u003cli data-section-id=\"vqvp0b\" data-start=\"707\" data-end=\"721\"\u003eHarsh shifts\u003c\/li\u003e\n\u003cli data-section-id=\"52vs3i\" data-start=\"722\" data-end=\"731\"\u003eJerking\u003c\/li\u003e\n\u003cli data-section-id=\"x6tcqm\" data-start=\"732\" data-end=\"746\"\u003eGear hunting\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"753\" data-end=\"783\"\u003e\u003cstrong\u003e3. Increases fuel economy\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp data-start=\"784\" data-end=\"836\"\u003eBy selecting the most efficient gear, the TCM helps:\u003c\/p\u003e\n\u003cul data-start=\"837\" data-end=\"929\"\u003e\n\u003cli data-section-id=\"1jv7ek5\" data-start=\"837\" data-end=\"874\"\u003eLower engine RPM at cruising speeds\u003c\/li\u003e\n\u003cli data-section-id=\"6gkiyf\" data-start=\"875\" data-end=\"900\"\u003eReduce fuel consumption\u003c\/li\u003e\n\u003cli data-section-id=\"e5cne\" data-start=\"901\" data-end=\"929\"\u003eImprove overall efficiency\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"936\" data-end=\"969\"\u003e\u003cstrong\u003e4. Protects the transmission\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp data-start=\"970\" data-end=\"1019\"\u003eThe TCM can detect problems and reduce damage by:\u003c\/p\u003e\n\u003cul data-start=\"1020\" data-end=\"1108\"\u003e\n\u003cli data-section-id=\"2kqk2i\" data-start=\"1020\" data-end=\"1042\"\u003eEntering “limp mode”\u003c\/li\u003e\n\u003cli data-section-id=\"4lqbtl\" data-start=\"1043\" data-end=\"1067\"\u003eLimiting certain gears\u003c\/li\u003e\n\u003cli data-section-id=\"13qyjqr\" data-start=\"1068\" data-end=\"1108\"\u003eAdjusting pressure to prevent slipping\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"1110\" data-end=\"1158\"\u003eThis can prevent expensive transmission failure.\u003c\/p\u003e\n\u003cp data-start=\"1165\" data-end=\"1196\"\u003e\u003cstrong\u003e5. Adapts to driving style\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp data-start=\"1197\" data-end=\"1236\"\u003eMany modern TCMs “learn” how you drive:\u003c\/p\u003e\n\u003cul data-start=\"1237\" data-end=\"1330\"\u003e\n\u003cli data-section-id=\"omgd08\" data-start=\"1237\" data-end=\"1284\"\u003eAggressive driving → later shifts, higher RPM\u003c\/li\u003e\n\u003cli data-section-id=\"hgzbm\" data-start=\"1285\" data-end=\"1330\"\u003eGentle driving → earlier shifts for economy\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"1332\" data-end=\"1359\"\u003eSome vehicles also include:\u003c\/p\u003e\n\u003cul data-start=\"1360\" data-end=\"1408\"\u003e\n\u003cli data-section-id=\"a07pup\" data-start=\"1360\" data-end=\"1372\"\u003eSport mode\u003c\/li\u003e\n\u003cli data-section-id=\"w72lbs\" data-start=\"1373\" data-end=\"1388\"\u003eTow\/haul mode\u003c\/li\u003e\n\u003cli data-section-id=\"3666mp\" data-start=\"1389\" data-end=\"1408\"\u003eManual shift mode\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"1415\" data-end=\"1459\"\u003e\u003cstrong\u003e6. Coordinates with the engine computer\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp data-start=\"1460\" data-end=\"1515\"\u003eThe TCM communicates with the engine control system to:\u003c\/p\u003e\n\u003cul data-start=\"1516\" data-end=\"1602\"\u003e\n\u003cli data-section-id=\"o2bsfy\" data-start=\"1516\" data-end=\"1552\"\u003eReduce engine torque during shifts\u003c\/li\u003e\n\u003cli data-section-id=\"1oflkpc\" data-start=\"1553\" data-end=\"1575\"\u003eImprove acceleration\u003c\/li\u003e\n\u003cli data-section-id=\"10m1d3o\" data-start=\"1576\" data-end=\"1602\"\u003eReduce drivetrain stress\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"1604\" data-end=\"1654\"\u003eThis coordination is important in modern vehicles.\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cbr\u003eSigns of Faulty K-4225:\u003cbr\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003ctable width=\"100%\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e \n\u003cp data-start=\"165\" data-end=\"195\"\u003e\u003cstrong\u003e1. Hard or jerky shifting\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp data-start=\"196\" data-end=\"217\"\u003eThe transmission may:\u003c\/p\u003e\n\u003cul data-start=\"218\" data-end=\"287\"\u003e\n\u003cli data-section-id=\"1y7nz92\" data-start=\"218\" data-end=\"234\"\u003eSlam into gear\u003c\/li\u003e\n\u003cli data-section-id=\"ptrbs9\" data-start=\"235\" data-end=\"260\"\u003eShift very aggressively\u003c\/li\u003e\n\u003cli data-section-id=\"1s9slnx\" data-start=\"261\" data-end=\"287\"\u003eFeel rough between gears\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"294\" data-end=\"318\"\u003e\u003cstrong\u003e2. Delayed shifting\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp data-start=\"319\" data-end=\"359\"\u003eYou press the gas, but the transmission:\u003c\/p\u003e\n\u003cul data-start=\"360\" data-end=\"437\"\u003e\n\u003cli data-section-id=\"1cfqu6o\" data-start=\"360\" data-end=\"393\"\u003eHesitates before changing gears\u003c\/li\u003e\n\u003cli data-section-id=\"sdmjq3\" data-start=\"394\" data-end=\"437\"\u003eTakes too long to engage Drive or Reverse\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"444\" data-end=\"496\"\u003e\u003cstrong\u003e3. Transmission stuck in one gear (“limp mode”)\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp data-start=\"497\" data-end=\"541\"\u003eMany vehicles enter a protection mode where:\u003c\/p\u003e\n\u003cul data-start=\"542\" data-end=\"613\"\u003e\n\u003cli data-section-id=\"1kw51a3\" data-start=\"542\" data-end=\"576\"\u003eThe car stays in 2nd or 3rd gear\u003c\/li\u003e\n\u003cli data-section-id=\"1ess5d0\" data-start=\"577\" data-end=\"613\"\u003eSpeed and acceleration are limited\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"615\" data-end=\"654\"\u003eThis helps prevent transmission damage.\u003c\/p\u003e\n\u003cp data-start=\"661\" data-end=\"682\"\u003e\u003cstrong\u003e4. Gear slipping\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp data-start=\"683\" data-end=\"699\"\u003eThe vehicle may:\u003c\/p\u003e\n\u003cul data-start=\"700\" data-end=\"799\"\u003e\n\u003cli data-section-id=\"1lsgf0i\" data-start=\"700\" data-end=\"723\"\u003eRandomly change gears\u003c\/li\u003e\n\u003cli data-section-id=\"i920se\" data-start=\"724\" data-end=\"764\"\u003eRev high without accelerating properly\u003c\/li\u003e\n\u003cli data-section-id=\"h6xpw7\" data-start=\"765\" data-end=\"799\"\u003eFeel like it “falls out” of gear\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"806\" data-end=\"862\"\u003e\u003cstrong\u003e5. Check Engine Light or transmission warning light\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp data-start=\"863\" data-end=\"902\"\u003eA bad TCM often triggers codes such as:\u003c\/p\u003e\n\u003cul data-start=\"903\" data-end=\"948\"\u003e\n\u003cli data-section-id=\"1769hbz\" data-start=\"903\" data-end=\"910\"\u003eP0700\u003c\/li\u003e\n\u003cli data-section-id=\"1jg16kl\" data-start=\"911\" data-end=\"925\"\u003eP0600 series\u003c\/li\u003e\n\u003cli data-section-id=\"1t22rwv\" data-start=\"926\" data-end=\"948\"\u003eShift solenoid codes\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"950\" data-end=\"993\"\u003eA scan tool is usually needed to read them.\u003c\/p\u003e\n\u003cp data-start=\"1000\" data-end=\"1026\"\u003e\u003cstrong\u003e6. No shifting at all\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp data-start=\"1027\" data-end=\"1048\"\u003eThe transmission may:\u003c\/p\u003e\n\u003cul data-start=\"1049\" data-end=\"1133\"\u003e\n\u003cli data-section-id=\"r4bpgr\" data-start=\"1049\" data-end=\"1081\"\u003eRefuse to upshift or downshift\u003c\/li\u003e\n\u003cli data-section-id=\"1s7r5j8\" data-start=\"1082\" data-end=\"1101\"\u003eStay neutral-like\u003c\/li\u003e\n\u003cli data-section-id=\"6h7rab\" data-start=\"1102\" data-end=\"1133\"\u003eFail to engage gears properly\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"1140\" data-end=\"1165\"\u003e\u003cstrong\u003e7. Poor fuel economy\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp data-start=\"1166\" data-end=\"1194\"\u003eImproper shifting can cause:\u003c\/p\u003e\n\u003cul data-start=\"1195\" data-end=\"1266\"\u003e\n\u003cli data-section-id=\"11s4g99\" data-start=\"1195\" data-end=\"1208\"\u003eHigher RPMs\u003c\/li\u003e\n\u003cli data-section-id=\"1v082jr\" data-start=\"1209\" data-end=\"1237\"\u003eInefficient gear selection\u003c\/li\u003e\n\u003cli data-section-id=\"1cfgqbb\" data-start=\"1238\" data-end=\"1266\"\u003eIncreased fuel consumption\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"1273\" data-end=\"1314\"\u003e\u003cstrong\u003e8. Erratic or unpredictable shifting\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp data-start=\"1315\" data-end=\"1327\"\u003eThe car may:\u003c\/p\u003e\n\u003cul data-start=\"1328\" data-end=\"1412\"\u003e\n\u003cli data-section-id=\"1uzv36u\" data-start=\"1328\" data-end=\"1344\"\u003eShift randomly\u003c\/li\u003e\n\u003cli data-section-id=\"1ursdc4\" data-start=\"1345\" data-end=\"1368\"\u003eShift at unusual RPMs\u003c\/li\u003e\n\u003cli data-section-id=\"nsxooc\" data-start=\"1369\" data-end=\"1412\"\u003eChange behavior from one drive to another\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"1419\" data-end=\"1462\"\u003e\u003cstrong\u003e9. Trouble going into Drive or Reverse\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp data-start=\"1463\" data-end=\"1478\"\u003eYou may notice:\u003c\/p\u003e\n\u003cul data-start=\"1479\" data-end=\"1543\"\u003e\n\u003cli data-section-id=\"11qfthg\" data-start=\"1479\" data-end=\"1492\"\u003eLong delays\u003c\/li\u003e\n\u003cli data-section-id=\"1hpzqvb\" data-start=\"1493\" data-end=\"1519\"\u003eHard engagement “clunks”\u003c\/li\u003e\n\u003cli data-section-id=\"15g41fl\" data-start=\"1520\" data-end=\"1543\"\u003eNo response initially\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cbr\u003e\u003cbr\u003eManufacturer information\u003c\/strong\u003e\u003cbr\u003eCompany was founded in 1911 by Joseph Eaton, a young entrepreneur who invested in the first gear-driven truck axle. Since then, Eaton has grown organically and through brand acquisitions, making it the industry giant that it is today. As the world's demand for power keeps increasing, so is the industry’s demand for Eaton Corporation products, which include engine and filtration solutions, motion and traction control products, transmission and steering system components, and a lot more\u003cbr\u003e\u003c\/p\u003e\n\u003chr\u003e\n\u003cp\u003e\u003cspan style=\"text-decoration: underline; color: rgb(43, 0, 255);\"\u003e\u003cstrong\u003eWarranty\u003c\/strong\u003e\u003c\/span\u003e\u003cbr\u003e\u003cspan style=\"text-decoration: underline; color: rgb(43, 0, 255);\"\u003eFirst Truck Parts offers a \u003cstrong\u003e365-days warranty\u003c\/strong\u003e for all types of parts and in any condition. The warranty applies only to buyers who have placed an order on our website.\u003c\/span\u003e\u003c\/p\u003e","brand":"Eaton","offers":[{"title":"Default Title","offer_id":48135071662324,"sku":"K-4225","price":2349.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0605\/1479\/5764\/files\/FULK4322__1_17612481-6e56-4ba9-b376-bd6e6913278e.jpg?v=1778184100","url":"https:\/\/firsttruckparts.com\/products\/k-4225-genuine-eaton-tcm-transmission-control-module-ep3","provider":"First Truck Parts","version":"1.0","type":"link"}