{"id":519561,"date":"2025-12-11T12:54:18","date_gmt":"2025-12-11T17:54:18","guid":{"rendered":"https:\/\/www.fs1inc.com\/blog\/dtc-u0629-lost-communication-ac-refrigerant-temperature-sensor-b\/"},"modified":"2025-12-11T12:54:18","modified_gmt":"2025-12-11T17:54:18","slug":"dtc-u0629-lost-communication-ac-refrigerant-temperature-sensor-b","status":"publish","type":"post","link":"https:\/\/www.fs1inc.com\/blog\/dtc-u0629-lost-communication-ac-refrigerant-temperature-sensor-b\/","title":{"rendered":"U0629 Code Symptoms, Causes, Diagnosis, Repair & Cost Guide Overview"},"content":{"rendered":"
\n
\n
U0629<\/div>\n

U0629 Code Symptoms, Causes, Diagnosis, Repair & Cost Guide Overview<\/h1>\n

\n<\/section>\n

\n

Quick Summary<\/h2>\n
    \n
  • U0629 means the HVAC control module has lost communication with A\/C refrigerant\u2011temperature sensor B. <\/li>\n
  • Drivers usually see a \u201csensor fault\u201d message, loss of automatic temperature control, and little or no cooling. <\/li>\n
  • Most causes are wiring\/connectors, a failed sensor, or a malfunctioning HVAC module. <\/li>\n
  • Diagnosis starts with a scan, power\/ground checks, and a communication test; repair may involve rewiring, sensor replacement, or module re\u2011programming. <\/li>\n
  • If the module\u2019s internal circuitry is damaged, a VIN\u2011matched replacement from Flagship One ensures proper programming and warranty coverage. <\/li>\n<\/ul>\n<\/div>\n

    U0629 Code: Symptoms, Diagnosis and Repair Steps <\/h3>\n

    Your vehicle\u2019s climate\u2011control display flashes \u201csensor fault,\u201d the automatic temperature\u2011regulation mode disengages, and the A\/C blows warm or barely cool air. In some cases the system reverts to manual fan\u2011only operation. Those are the typical signs that trigger the U0629 diagnostic trouble code. Because the code specifically references \u201cLost Communication With A\/C Refrigerant Temperature Sensor B,\u201d the problem is confined to the HVAC network rather than engine or safety systems. Recognizing the symptoms early prevents prolonged discomfort and avoids unnecessary wear on the HVAC blower motor. <\/p>\n

    Symptoms <\/h3>\n
      \n
    • Climate\u2011control warning:<\/strong> \u201cSensor B Fault\u201d or similar message on the LCD panel. <\/li>\n
    • Loss of automatic climate control:<\/strong> The system stays at the last manually set temperature. <\/li>\n
    • Reduced cooling performance:<\/strong> Air temperature remains near ambient; the A\/C may appear to be off. <\/li>\n
    • Fan operation only:<\/strong> The blower runs, but no refrigerant\u2011temperature regulation occurs. <\/li>\n
    • Intermittent operation:<\/strong> The fault may appear and disappear after the vehicle is restarted. <\/li>\n<\/ul>\n

      Why This Happens <\/h3>\n

      Faulty Refrigerant\u2011Temperature Sensor B <\/h4>\n

      The sensor measures the temperature of refrigerant in the low\u2011pressure line. If the sensor\u2019s internal thermistor fails open or shorted, the HVAC module receives no valid data and logs U0629. <\/p>\n

      Wiring or Connector Corrosion <\/h4>\n

      The sensor\u2019s signal travels through a dedicated harness. Exposure to moisture, road salt, or vibration can corrode pins or break conductors, interrupting the communication link. <\/p>\n

      HVAC Control Module Internal Failure <\/h4>\n

      The module that processes sensor data contains an analog\u2011to\u2011digital converter and a communication controller. Water intrusion, solder joint fatigue, or a failed microcontroller can stop the module from reading sensor B, even when the sensor itself is functional. <\/p>\n

      Software or Calibration Errors <\/h4>\n

      A corrupted flash memory or an outdated calibration table may cause the module to reject legitimate sensor signals, resulting in a communication loss flag. <\/p>\n

      Environmental Factors (Heat\/Cold Shock) <\/h4>\n

      Extreme temperature cycles can cause expansion\u2011contraction stress on the sensor wiring or on the module\u2019s circuit board, leading to intermittent loss of signal. <\/p>\n

      Diagnostic and Repair Procedures <\/h3>\n
        \n
      1. Read the code with a manufacturer\u2011specific scan tool.<\/strong> Confirm that only U0629 is present; additional HVAC codes may indicate broader system issues.\n<\/li>\n
      2. Verify sensor power and ground.<\/strong> Using a multimeter, check that the sensor B circuit has the correct voltage (typically 5 V) and a solid ground reference. No voltage suggests a wiring break or blown fuse.\n<\/li>\n
      3. Inspect wiring harness and connectors.<\/strong> Look for corrosion, bent pins, or damaged insulation. Clean contacts with electrical contact cleaner and reseat the connector.\n<\/li>\n
      4. Measure sensor resistance.<\/strong> With the sensor disconnected, measure resistance across the signal leads; a typical thermistor reads ~1 k\u03a9 at 25 \u00b0C. Values far outside this range indicate a failed sensor.\n<\/li>\n
      5. Perform a module communication test.<\/strong> The scan tool can request live data from sensor B; a \u201cno response\u201d result confirms a communication loss.\n<\/li>\n
      6. Reprogram or calibrate the HVAC module.<\/strong> If the hardware checks out, update the module\u2019s software to the latest factory version and run the calibration routine for refrigerant\u2011temperature sensors.\n<\/li>\n
      7. Replace the sensor if it fails resistance or power tests.<\/strong> Install a new OEM\u2011type sensor B, verify proper connector seating, and clear the code.\n<\/li>\n
      8. Replace the HVAC control module when internal failure is confirmed.<\/strong> Remove the faulty module, install a VIN\u2011matched replacement, and have it programmed to the vehicle\u2019s specific configuration.\n<\/li>\n<\/ol>\n

        Typical labor for a full diagnostic sequence is 1.5\u20132 hours ($150\u2013$250). Sensor replacement adds 0.5 hour ($50\u2013$80). Module replacement, including programming, generally costs $600\u2013$900 for the unit plus $200\u2013$300 labor. <\/p>\n

        When Replacement Makes More Sense <\/h3>\n

        If the HVAC control module repeatedly loses communication after wiring repairs and sensor replacement, internal circuitry damage is likely. Continuing to repair a compromised module often leads to recurring faults and higher long\u2011term costs. In such cases, a direct swap with a new, factory\u2011calibrated unit eliminates the root cause. <\/p>\n

        Modern control modules are complex and integrated with security and immobilizer systems. That\u2019s why choosing a replacement isn\u2019t only about the hardware\u2014it’s about correct programming and compatibility. Flagship One<\/strong> specializes in VIN\u2011matched control modules, providing a plug\u2011and\u2011drive solution backed by warranty. Their units are pre\u2011programmed to match your vehicle\u2019s software version, ensuring seamless integration and eliminating the need for dealer\u2011only re\u2011coding. <\/p>\n

        Preventive Maintenance <\/h3>\n
          \n
        • Keep sensor wiring dry:<\/strong> Inspect the low\u2011pressure line harness during regular A\/C service and apply dielectric grease to connector pins. <\/li>\n
        • Secure connectors:<\/strong> Ensure all HVAC connectors are fully seated after any bumper or under\u2011body work that could disturb wiring. <\/li>\n
        • Periodic scans:<\/strong> A quick OBD\u2011II scan during routine maintenance can catch intermittent communication losses before they trigger a fault. <\/li>\n
        • Protect against corrosion:<\/strong> Wash the under\u2011carriage after winter road\u2011salt exposure and dry the area around the refrigerant\u2011temperature sensor. <\/li>\n
        • Avoid extreme temperature shocks:<\/strong> When the vehicle sits in a garage that swings from sub\u2011zero to high heat, allow the HVAC system to idle briefly before shutting off, reducing stress on sensor circuitry.<\/li>\n<\/ul>\n
          \n

          Service Recommendation:<\/strong> Most issues related to this fault are diagnosed and corrected through inspection, wiring repair, and calibration rather than module replacement. For modules not typically replaced through aftermarket suppliers, diagnosis and repair should be performed by a certified automotive technician with access to factory service information and tooling.<\/p>\n<\/div>\n

          \n

          Frequently Asked Questions<\/h2>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"

          A\/C won\u2019t cool and U0629 appears on your vehicle \u2013 lost communication with refrigerant temp sensor B can disable HVAC. Scan, re\u2011program or replace sensor.<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"elementor_header_footer","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[4],"tags":[],"class_list":["post-519561","post","type-post","status-publish","format-standard","hentry","category-auto-news"],"acf":[],"yoast_head":"\nU0629 Code Symptoms, Causes, Diagnosis, Repair & Cost Guide Overview - Flagship One Blog<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.fs1inc.com\/blog\/dtc-u0629-lost-communication-ac-refrigerant-temperature-sensor-b\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"U0629 Code Symptoms, Causes, Diagnosis, Repair & Cost Guide Overview - Flagship One Blog\" \/>\n<meta property=\"og:description\" content=\"A\/C won\u2019t cool and U0629 appears on your vehicle \u2013 lost communication with refrigerant temp sensor B can disable HVAC. 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