{"id":519592,"date":"2025-12-11T13:23:10","date_gmt":"2025-12-11T18:23:10","guid":{"rendered":"https:\/\/www.fs1inc.com\/blog\/dtc-u0660-lost-communication-left-rear-temperature-actuator-b\/"},"modified":"2025-12-11T13:23:10","modified_gmt":"2025-12-11T18:23:10","slug":"dtc-u0660-lost-communication-left-rear-temperature-actuator-b","status":"publish","type":"post","link":"https:\/\/www.fs1inc.com\/blog\/dtc-u0660-lost-communication-left-rear-temperature-actuator-b\/","title":{"rendered":"U0660 Code Symptoms, Causes, Diagnosis, Reprogramming & Repair Guide"},"content":{"rendered":"
\n
\n
U0660<\/div>\n

U0660 Code Symptoms, Causes, Diagnosis, Reprogramming & Repair Guide<\/h1>\n

\n<\/section>\n

\n

Quick Summary<\/h2>\n
    \n
  • U0660 means the vehicle\u2019s control module has lost communication with the left\u2011rear temperature actuator B. <\/li>\n
  • Typical warnings: HVAC or \u201ctemperature sensor\u201d light, loss of automatic climate\u2011control functions, uneven cabin heating\/cooling. <\/li>\n
  • Most causes are wiring\/connectors, actuator failure, or a module communication fault. <\/li>\n
  • Diagnosis starts with a scan tool, visual wiring inspection, and a communication test of the HVAC control module. <\/li>\n
  • Repair may involve rewiring, connector cleaning, or reprogramming; persistent faults often require a replacement control module programmed to the vehicle\u2019s VIN. <\/li>\n<\/ul>\n<\/div>\n

    Introduction <\/h3>\n

    Drivers who see an HVAC warning lamp or notice that the automatic climate\u2011control system stops adjusting temperature are often told a \u201cU0660\u201d code has been stored. The code specifically indicates that the vehicle\u2019s control module can no longer talk to the left\u2011rear temperature actuator B, the sensor that feeds cabin\u2011temperature data from the rear passenger side. Because the HVAC system relies on accurate temperature feedback to modulate blower speed, blend doors, and heating elements, loss of that signal can leave the climate system stuck in a fixed mode or cycling erratically. Early identification through a scan and a focused communication check prevents prolonged discomfort and avoids unnecessary component replacement.<\/p>\n

    Symptoms <\/h3>\n
      \n
    • HVAC warning light<\/strong> (often labeled \u201cTemp Sensor,\u201d \u201cClimate,\u201d or a thermometer icon) illuminated on the dash. <\/li>\n
    • Automatic climate\u2011control disengaged<\/strong> \u2013 the system stays at the last set temperature, ignores \u201cauto\u201d selections, or defaults to a single fan speed. <\/li>\n
    • Uneven heating or cooling<\/strong> in the rear seats, while the front zone may still respond correctly. <\/li>\n
    • Manual temperature adjustments have little effect<\/strong> on the left\u2011rear zone; the temperature appears stuck at a high or low extreme. <\/li>\n
    • Intermittent loss of rear\u2011zone climate control<\/strong> that appears after the vehicle has been driven for a while, suggesting a wiring or connector issue that worsens with vibration or heat.<\/li>\n<\/ul>\n

      Why Communication Problems Occur <\/h3>\n

      1. Wiring Harness Damage or Corrosion <\/h4>\n

      The temperature actuator is connected to the HVAC control module through a dedicated harness. Pin\u2011point bends, rodent damage, or exposure to moisture can create high\u2011resistance joints or open circuits. Corroded terminals impede the low\u2011level signal the actuator uses, causing the module to register a loss of communication.<\/p>\n

      2. Faulty Connector or Pin\u2011out Mismatch <\/h4>\n

      Connectors at the actuator or module can develop bent pins, broken clips, or debris. A misaligned pin\u2011out prevents the module from receiving the sensor\u2019s voltage reference, leading the diagnostic scanner to set U0660.<\/p>\n

      3. Actuator Internal Failure <\/h4>\n

      The actuator contains a thermistor or resistance\u2011based temperature sensor and a small driver circuit. If the thermistor opens or the driver burns out, the module sees an out\u2011of\u2011range value and flags a communication loss. The actuator may still appear physically intact, making the fault hard to spot without a bench test.<\/p>\n

      4. HVAC Control Module Software Glitch <\/h4>\n

      Modern HVAC modules store calibration tables for each temperature sensor. Corrupted flash memory or an incomplete previous reprogramming can make the module ignore the left\u2011rear actuator B, even though the hardware is sound. The error persists until the module is re\u2011flashed or replaced.<\/p>\n

      5. Module Internal Hardware Fault <\/h4>\n

      Circuit board cracks, failed voltage regulators, or damaged communication transceivers inside the HVAC control module can break the data link to the actuator. In such cases, the module reports a loss of communication despite clean wiring and a functional actuator.<\/p>\n

      Diagnostic and Repair Procedures <\/h3>\n
        \n
      1. Retrieve the Code with a Professional Scan Tool<\/strong>\n<\/li>\n<\/ol>\n

        – Connect a manufacturer\u2011specific scanner. Confirm that U0660 is present and note any related codes (e.g., U0661 for the left\u2011rear actuator A) that may indicate a broader communication issue.<\/p>\n

          \n
        1. Perform a Live Data Check<\/strong>\n<\/li>\n<\/ol>\n

          – Access the HVAC module\u2019s live data stream. Verify whether the left\u2011rear temperature sensor B shows a valid voltage or resistance reading. A \u201c\u2011\u201d or \u201cN\/A\u201d indicates a communication break.<\/p>\n

            \n
          1. Visual Inspection of Wiring and Connectors<\/strong>\n<\/li>\n<\/ol>\n

            – Locate the left\u2011rear actuator harness. Look for chafed insulation, exposed conductors, or water intrusion. <\/p>\n

            – Disconnect the actuator connector and inspect pins for corrosion, bending, or missing contacts. Clean with electrical contact cleaner and reseat.<\/p>\n

              \n
            1. Continuity and Resistance Tests<\/strong>\n<\/li>\n<\/ol>\n

              – With the ignition off, use a multimeter to check continuity from the module\u2019s pin to the actuator connector. Open circuits point to wiring damage. <\/p>\n

              – Measure the actuator\u2019s resistance at the connector (typically 2 k\u03a9 \u00b1 10 %). Values far outside this range suggest a failed sensor.<\/p>\n

                \n
              1. Module Communication Test<\/strong>\n<\/li>\n<\/ol>\n

                – Some scan tools offer a \u201ccommunication test\u201d that sends a request to the actuator and waits for a response. Failure confirms a loss of data exchange, not just a sensor fault.<\/p>\n

                  \n
                1. Reprogram the HVAC Control Module<\/strong>\n<\/li>\n<\/ol>\n

                  – If wiring and the actuator test good, reflash the module with the latest factory software. This clears corrupted tables and restores proper sensor mapping. Reprogramming costs $150\u2011$250 for the flash plus $100\u2011$150 labor at a qualified shop.<\/p>\n

                    \n
                  1. Module Repair or Replacement<\/strong>\n<\/li>\n<\/ol>\n

                    – When the module fails the communication test after reprogramming, internal hardware damage is likely. Repair options (e.g., board\u2011level component replacement) are limited and often temporary. <\/p>\n

                    – Replace the HVAC control module with a VIN\u2011matched unit. The replacement is programmed to the vehicle\u2019s specific software version, ensuring all climate functions operate correctly. Expect a part cost of $400\u2011$700 plus $150\u2011$250 labor.<\/p>\n

                      \n
                    1. Clear Codes and Verify Operation<\/strong>\n<\/li>\n<\/ol>\n

                      – After repair or replacement, clear the DTCs and perform a functional test: engage automatic climate control, adjust rear temperature, and confirm the HVAC warning light remains off.<\/p>\n

                      Preventive Maintenance <\/h3>\n
                        \n
                      • Inspect HVAC Wiring Routinely<\/strong> \u2013 During regular under\u2011car checks, look for signs of wear near the rear seats where the temperature actuator resides. Early detection of frayed bundles prevents communication loss. <\/li>\n
                      • Keep Connectors Dry<\/strong> \u2013 Moisture is a common cause of corrosion. If the vehicle operates in rainy climates, spray a silicone\u2011based dielectric protectant on the actuator connector after cleaning. <\/li>\n
                      • Avoid Excessive Vibration<\/strong> \u2013 Secure any loose trim or seat\u2011frame components that could rub against the wiring harness. Vibration\u2011induced fatigue often shows up as intermittent U0660 codes. <\/li>\n
                      • Schedule Software Updates<\/strong> \u2013 Manufacturers periodically release HVAC module calibrations. Having the latest software installed reduces the chance of internal communication glitches. <\/li>\n
                      • Use OEM\u2011Approved Diagnostic Tools<\/strong> \u2013 Properly calibrated scan tools read the exact voltage ranges the actuator expects, preventing false\u2011positive codes during maintenance.<\/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":"

                        Your vehicle reports lost communication with left\u2011rear temperature actuator B\u2014climate may be off. 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