Check the 'Possible Causes' listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector pins.
The cost to diagnose the U1431 code is 1.0 hour of labor. The diagnosis time and labor rates at auto repair shops vary depending on the location, make and model of the vehicle, and even the engine type. Most auto repair shops charge between $75 and $150 per hour.
The system is monitored with the ignition on, battery voltage between 9 and 16 volts, and engine run time greater than three seconds. The Diagnostic Trouble Code (DTC) sets when the Powertrain Control Module (PCM) either doesn't receive a bus message or receives an implausible bus message from the Adaptive Cruise Control (ACC) Module.
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Get the U1431 code diagnosed by a professional: Find a repair shop in your area