{"product_id":"paccar-relay-module-repair-service-q21-1050","title":"Paccar Q21-1050 Door Relay Module Repair Service | Kenworth \u0026 Peterbilt","description":"\u003cp\u003e\u003cstrong\u003ePaccar Control Relay Module Repair Service (Q21-1050)\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eOur Q21-1050 control door relay module repair service fixes driver-side power window, power mirror, door lock, and interior lighting faults common to Kenworth (T300, T660, T800, W900) and Peterbilt (386, 388, 389) trucks, without the cost of a full replacement. We diagnose, rebuild, and bench test every module, with a turnaround of 24 hours and \u003cstrong\u003e\u003cspan style=\"color: rgb(255, 42, 0);\"\u003eno additional programming required\u003c\/span\u003e\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cdetails open=\"\"\u003e\n\u003csummary style=\"cursor: pointer; color: #d1ba98; font-weight: bold; text-decoration: underline; display: inline-flex; align-items: center; gap: 6px; margin-top: 15px; margin-bottom: 15px; transition: color 0.2s ease-in-out;\"\u003e\u003cspan\u003eLearn more\u003c\/span\u003e \u003csvg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewbox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"5px\" stroke-linecap=\"square\" stroke-linejoin=\"miter\" style=\"width: 14px; height: 14px;\"\u003e\n      \u003cpolyline points=\"6 9 12 15 18 9\"\u003e\u003c\/polyline\u003e\n    \u003c\/svg\u003e\u003c\/summary\u003e\n\u003cp\u003e\u003cstrong\u003eWhat we repair\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eOur technicians diagnose and rebuild Q21-1050 (including Q21-1050-001, Q21-1050-002, and Q211050) driver side door control relay modules using professional grade diagnostic equipment and high quality replacement components. We target the internal relay contacts, circuit board connections, and solder joints that most commonly fail with age, moisture, and vibration:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eDriver or passenger windows failing to operate from the driver master switch\u003c\/li\u003e\n\u003cli\u003ePower door lock switches unresponsive or operating intermittently\u003c\/li\u003e\n\u003cli\u003ePower mirror adjustment controls failing or freezing\u003c\/li\u003e\n\u003cli\u003eFalse \"Door Ajar\" warnings illuminated on the dashboard\u003c\/li\u003e\n\u003cli\u003eInterior dome lights failing to trigger when opening the driver door\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eEvery module is bench tested before it ships to confirm all door lock, window driver circuit, mirror controls, and lighting functions perform to like-new specification.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWho it's for\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThis service is built for fleet managers, owner operators, and diesel technicians who need a Paccar truck's door electrical system working correctly again without paying dealership prices for a brand new control door relay module. It's a direct, cost effective alternative to buying an exchange unit, especially useful when nuisance door ajar warnings or non responsive locks are pulling a truck out of service for something that doesn't require a full module swap.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eFast turnaround, no reprogramming\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eWe prioritize quick turnaround on every Q21-1050 repair to minimize downtime. Your repaired control door relay module ships back ready to install with \u003cstrong\u003eno additional programming required\u003c\/strong\u003e, so you can plug it in and get back on the road. GoECM backs its remanufactured and repaired modules with a warranty, so you're covered after the repair, not just on installation day.\u003c\/p\u003e\n\u003c\/details\u003e","brand":"GoECM","offers":[{"title":"Default Title","offer_id":48253417193730,"sku":null,"price":295.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0259\/2538\/6300\/files\/Paccar_Q21-1050_Door_Relay_Module_Repair_Service.png?v=1785952134","url":"https:\/\/goecm.com\/products\/paccar-relay-module-repair-service-q21-1050","provider":"GoECM","version":"1.0","type":"link"}