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 U1121 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.
Several control units are applied to electronically controlled vehicles. These units perform each control with information from various sensors. Thus, sharing signal information from sensors is needed, so CAN communication type whose communication speed is high and insensitive to electrical noise by spark generation is adopted to controlling powertrain (TCM, ECM, CLUSTER, Electronic Stability Control (ESC), 4WD, SAS, EPS). CAN communication consists of CAN-BUS HIGH, CAN BUS LOW, and two 120 ohm resistance in the circuit. If the 4WD ECU doesn't get some ESC signals from the ESC module, it sets U1126.
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