{"product_id":"paccar-q21-1055-1-100-cecu-cab-control-module-2008-peterbilt-used","title":"Paccar Q21-1055-1-100 CECU Cab Control Module – 2008 Peterbilt | Used","description":"\u003cp\u003eUsed genuine PACCAR Q21-1055-1-100 Cab Electronic Control Unit (CECU) in serviceable condition, pulled from a 2008 Peterbilt. The CECU is the central body controller for late-2000s-era Kenworth and Peterbilt trucks — it bridges dash cluster, body lighting, HVAC controls, multiplexed switches, and the J1939 \/ J1587 data buses inside the cab.\u003c\/p\u003e\n\u003ch2\u003eSigns of a Failing CECU\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eMultiple unrelated cab faults appearing simultaneously\u003c\/li\u003e\n\u003cli\u003eIntermittent or total loss of dash gauge or warning-lamp function\u003c\/li\u003e\n\u003cli\u003eHVAC, lighting, or accessory switches not responding\u003c\/li\u003e\n\u003cli\u003eJ1939 \/ J1587 data-bus communication faults at the cab module\u003c\/li\u003e\n\u003cli\u003eDiagnostic tool unable to communicate with the cab module\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eManufacturer\u003c\/th\u003e\n\u003ctd\u003ePACCAR\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003ePart Number\u003c\/th\u003e\n\u003ctd\u003eQ21-1055-1-100\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003ePart Type\u003c\/th\u003e\n\u003ctd\u003eCECU — Cab Electronic Control Unit\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003ePull Source\u003c\/th\u003e\n\u003ctd\u003e2008 Peterbilt\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eCondition\u003c\/th\u003e\n\u003ctd\u003eUsed — tested \/ good\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eProgramming\u003c\/th\u003e\n\u003ctd\u003eRequired (PACCAR ESA, by dealer)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eWarranty\u003c\/th\u003e\n\u003ctd\u003eNone\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eCore Charge\u003c\/th\u003e\n\u003ctd\u003eNone\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch2\u003eProgramming Required\u003c\/h2\u003e\n\u003cp\u003eThis CECU is configured to a specific truck VIN at the factory and again whenever the module is replaced. Before installation it must be programmed to your truck’s build configuration using PACCAR ESA (Electronic Service Analyst) software at a Kenworth or Peterbilt dealer. An unprogrammed CECU will not communicate correctly with the rest of the cab’s electronics.\u003c\/p\u003e\n\u003ch2\u003eApplications\u003c\/h2\u003e\n\u003cp\u003eThe Q21-1055-1-100 CECU was used on Kenworth and Peterbilt trucks in the 2007–2010 CECU platform window. Application varies by truck model, options, engine, and transmission — match the exact PACCAR part number on your existing module before ordering.\u003c\/p\u003e\n\u003cp\u003e\u003cem\u003eConfirm the part number printed on your existing CECU label exactly. PACCAR has used several similar Q21-prefix CECU part numbers across model years, and they are not interchangeable.\u003c\/em\u003e\u003c\/p\u003e","brand":"Paccar","offers":[{"title":"Default Title","offer_id":47440942760221,"sku":"Q21-1055-1-100","price":595.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0053\/0730\/1991\/files\/rn-image_picker_lib_temp_8710921c-e99b-4d6b-a4e5-da9add056ae5.jpg?v=1705133056","url":"https:\/\/www.allprodiesel.net\/products\/paccar-q21-1055-1-100-cecu-cab-control-module-2008-peterbilt-used","provider":"All Pro Truck Parts","version":"1.0","type":"link"}